MaCalculatriceEnLigne

List all available tool bundles (grouped by domain). Use this to discover which tools are available for a specific topic instead of browsing all 500+ tools.

Get the list of tools in a specific bundle. Returns tool names and descriptions for the requested domain bundle.

Calculate French income tax (IR) 2026 on 2025 income per Article 197 CGI: progressive brackets with family quotient, family-quotient cap (1,807 EUR per extra half-share beyond 1 share single / 2 shares couple, 903.50 EUR per quarter share) and décote (897 EUR single / 1,483 EUR couple minus 45.25% of tax). Not implemented: the 4,262 EUR cap for single parents (parent isolé) and the special 1,079 / 1,801 EUR cases of art. 197 I-2; DOM reductions. Returns: {income, family_quotient, tax_before_cap, qf_cap, tax_after_cap, decote, total_tax, effective_rate_pct, marginal_rate_pct, brackets}. See list_bundles for related 'finance-france' calculators.

Convert French gross salary to net salary for 2026 (cadre, non-cadre, or civil servant). Returns monthly/annual net, social contributions, employer cost. See list_bundles for related 'finance-france' calculators.

Calculate French VAT (TVA) — convert between HT (before tax) and TTC (after tax). Supports all 4 French VAT rates. Returns: {amount_ht, amount_ttc, vat_amount, vat_rate}. See list_bundles for related 'finance-france' calculators.

Calculate mortgage/loan monthly payment, total cost, and optional amortization schedule. Returns: {principal, months, monthly_payment, total_interest, total_cost}. See list_bundles for related 'finance-france' calculators.

Compute compound interest growth A=P(1+r/n)^(nt). Use for savings, retirement projections, investment forecasting. Returns final amount, total interest, and yearly breakdown. See list_bundles for related 'finance-universal' calculators.

Compute simple interest I=P·r·t. Use for short-term loans, basic savings accounts, and homework. Returns interest amount and final balance. See list_bundles for related 'finance-universal' calculators.

Calculate monthly loan payment for any generic loan. Returns: {principal, monthly_payment, total_cost, total_interest}. See list_bundles for related 'finance-universal' calculators.

Compute break-even point in units and revenue. Use for business plans and pricing decisions. Inputs: fixed costs, price/unit, variable cost/unit. Returns break-even units and revenue. See list_bundles for related 'finance-universal' calculators.

Calculate gross margin, net margin, and markup percentage. Returns: {revenue, cost}. See list_bundles for related 'finance-universal' calculators.

Compute Return on Investment as a percentage. Use to evaluate investments, marketing spend, or projects. Inputs: investment cost, return value. Returns ROI %, profit, and multiple. See list_bundles for related 'finance-universal' calculators.

Calculate discounted price with optional successive discounts. Returns: {original_price, price_after_first, effective_discount_pct}. See list_bundles for related 'finance-universal' calculators.

Calculate VAT/GST/sales tax for any country with custom rate. Returns: {amount_before_tax, amount_after_tax, tax_amount, tax_rate}. See list_bundles for related 'finance-universal' calculators.

Calculate unit cost price from raw materials, labor, and overhead. Returns: {total_cost}. See list_bundles for related 'finance-universal' calculators.

Compute debt-to-income (DTI) ratio. Use for mortgage qualification or financial health checks. Inputs: monthly debt, monthly gross income. Returns DTI % and risk category. See list_bundles for related 'finance-universal' calculators.

Adjust a nominal amount to a target year using a constant inflation rate. Use for real-value comparisons across time. Inputs: amount, inflation rate %, years. Returns adjusted value and total inflation factor. See list_bundles for related 'finance-universal' calculators.

Compare purchasing power between two years. Use to translate historical prices, salaries, or savings to today's value. Inputs: amount, from-year, to-year, average inflation %. Returns equivalent value. See list_bundles for related 'finance-universal' calculators.

Calculate percentages: value of total, percentage change, what percent. See list_bundles for related 'math' calculators.

Compute simple, weighted, geometric, or harmonic mean. Use for grade averages, returns, or rates. Inputs: values list, optional weights, mode. Returns mean and detail. See list_bundles for related 'math' calculators.

Find missing side of right triangle using Pythagorean theorem. Returns: {error}. See list_bundles for related 'math' calculators.

Compute area for common 2D shapes (rectangle, triangle, circle, trapezoid, etc.). Use for geometry, real estate, or paint estimates. Inputs: shape + dimensions. Returns area in input-units squared. See list_bundles for related 'math' calculators.

Compute volume for common 3D shapes (cube, cylinder, sphere, cone, prism). Use for geometry, packaging, or construction. Inputs: shape + dimensions. Returns volume in input-units cubed. See list_bundles for related 'math' calculators.

Calculate perimeter/circumference for common shapes. Returns: {shape, perimeter}. See list_bundles for related 'math' calculators.

Calculate GCD (PGCD) and LCM (PPCM) of two integers using Euclidean algorithm. Returns: {gcd, lcm}. See list_bundles for related 'math' calculators.

Solve 1st degree (ax+b=0) or 2nd degree (ax²+bx+c=0) equations. Returns: {error}. See list_bundles for related 'math' calculators.

Calculate nth term and sum of arithmetic or geometric sequence. Returns: {common_difference, nth_term, sum_of_n}. See list_bundles for related 'math' calculators.

Perform fraction operations: add, subtract, multiply, divide, simplify. Returns: {input, result, decimal}. See list_bundles for related 'math' calculators.

Calculate logarithm in any base (natural, common, binary). Returns: {result}. See list_bundles for related 'math' calculators.

Calculate factorial, permutations P(n,r), and combinations C(n,r). Returns: {factorial}. See list_bundles for related 'math' calculators.

Compute sin, cos, tan and inverse functions in degrees or radians. Use for geometry, physics, navigation. Inputs: function, value, unit. Returns result and reciprocal. See list_bundles for related 'math' calculators.

Convert numbers between bases (binary, octal, decimal, hexadecimal, any base 2-36). Returns: {input, decimal_value, result}. See list_bundles for related 'math' calculators.

Convert temperature between Celsius, Fahrenheit, and Kelvin. Use for cooking, weather, science. Inputs: value, from, to. Returns converted temperature. See list_bundles for related 'conversions' calculators.

Convert distance between metric (m, km, cm, mm) and imperial (in, ft, yd, mi) plus nautical miles. Use for travel, sport, or engineering. Inputs: value, from, to. Returns: {input, factor}. See list_bundles for related 'conversions' calculators.

Convert weight/mass between kg, g, mg, lb, oz, st, tonne. Use for cooking, shipping, or fitness. Inputs: value, from, to. Returns converted mass. See list_bundles for related 'conversions' calculators.

Convert volume between L, mL, cL, fl_oz, cup, tbsp, tsp, gal_us, gal_uk. Use for cooking and science. Inputs: value, from, to. Returns: {input}. See list_bundles for related 'conversions' calculators.

Convert area between m², km², ha, are, acre, ft², yd², cm². Use for real estate, agriculture, or construction. Inputs: value, from, to. Returns: {input}. See list_bundles for related 'conversions' calculators.

Convert speed between km/h, mph, m/s, knots, ft/s. Use for travel, sport, or maritime/aviation. Inputs: value, from, to. Returns: {input}. See list_bundles for related 'conversions' calculators.

Convert pressure between Pa, kPa, MPa, bar, psi, atm, mmHg, mbar, torr. Use for engineering, tires, weather. Inputs: value, from-unit, to-unit. Returns: {input}. See list_bundles for related 'conversions' calculators.

Convert between digital storage units (binary and decimal). Returns: {input}. See list_bundles for related 'conversions' calculators.

Convert energy between J, kJ, cal, kcal, kWh, BTU, eV, ft-lb. Use for nutrition, electricity, science. Inputs: value, from, to. Returns: {input}. See list_bundles for related 'conversions' calculators.

Convert angle between degrees, radians, gradians, turns, arcminutes, arcseconds. Use for math, navigation, surveying. Inputs: value, from, to. Returns: {input}. See list_bundles for related 'conversions' calculators.

Convert time between seconds, minutes, hours, days, weeks, months, years. Use for project planning or unit homogenization. Inputs: value, from, to. Returns: {input}. See list_bundles for related 'conversions' calculators.

Convert fuel consumption between L/100km, mpg-US, mpg-UK, km/L. Use for car comparison across regions. Inputs: value, from, to. Returns: {input}. See list_bundles for related 'conversions' calculators.

Convert cooking measurements between ml, L, g, kg, cup, tbsp, tsp, fl_oz, oz. Use for recipe scaling and translating. Inputs: value, from, to. Returns: {input}. See list_bundles for related 'conversions' calculators.

Convert shoe sizes between EU, US (men/women), and UK systems. Use for online shopping. Inputs: size, from, to, gender. Returns converted size. See list_bundles for related 'conversions' calculators.

Compute simple or weighted grade average. Use for school report cards. Inputs: grades list, optional weights/coefficients. Returns weighted average and missing-grade-needed forecast. See list_bundles for related 'education' calculators.

Calculate binomial probability P(X=k) and cumulative P(X<=k). Returns: {exact_probability, cumulative_probability, std_deviation}. See list_bundles for related 'education' calculators.

Calculate descriptive statistics: mean, median, mode, std dev, quartiles. Returns: {count, std_deviation, min, max, range, iqr}. See list_bundles for related 'education' calculators.

Solve rule of three (cross-multiplication): if a→b, then c→? Use for proportions, recipe scaling, or unit pricing. Inputs: a, b, c. Returns x. See list_bundles for related 'education' calculators.

Compare unit prices across packages to find the best deal. Use for shopping. Inputs: list of {price, quantity, unit}. Returns price per unit and best buy. See list_bundles for related 'education' calculators.

Compute restaurant tip and per-person split. Use for shared meals. Inputs: bill, tip %, people count. Returns tip, total, per-person share. See list_bundles for related 'vie-quotidienne' calculators.

Estimate French Brevet (DNB) score from grades and continuous-control marks. Use for collège students forecasting their result. Inputs: grades by subject, continuous control. Returns total points and mention. See list_bundles for related 'education' calculators.

Estimate French Baccalauréat final score from grades and coefficients. Use to track lycée results before official scores. Inputs: grades by subject with coefficients. Returns weighted average and mention. See list_bundles for related 'education' calculators.

Estimate ECTS credit workload (1 ECTS ≈ 25-30 study hours). Use for university course planning across Europe. Inputs: course hours, credits target. Returns expected workload and balance. See list_bundles for related 'education' calculators.

Estimate Parcoursup admission score from bac + lycée grades. Use for French university candidates. Inputs: grades and coefficients per subject. Returns estimated score. See list_bundles for related 'education' calculators.

Calculate numerology life path number from birth date. Returns: {life_path_number, meaning}. See list_bundles for related 'fun' calculators.

Determine Chinese zodiac animal and element from birth year. Returns: {full_sign}. See list_bundles for related 'fun' calculators.

Compute physical, emotional, and intellectual biorhythm cycles for a date based on birth date. Use for self-tracking enthusiasts (pseudoscience). Inputs: birth date, target date. Returns 3 cycle values (-100 to +100) and zone. See list_bundles for related 'fun' calculators.

Calculate exact age in multiple units from birth date. Returns: {weeks, hours, minutes, seconds}. See list_bundles for related 'fun' calculators.

Find the day of the week for any date (Zeller's congruence). Use for historical dates or birthday checks. Inputs: day, month, year. Returns weekday name. See list_bundles for related 'fun' calculators.

Compute cement, sand, gravel, and water for a given concrete volume (NF DTU 21). Use for construction projects. Inputs: volume m³, mix ratio. Returns weights of each ingredient. See list_bundles for related 'construction' calculators.

Compute paint liters needed for a surface with chosen number of coats. Use for painting projects. Inputs: surface m², coats, paint coverage m²/L. Returns liters and number of cans. See list_bundles for related 'construction' calculators.

Compute tiles needed including a waste margin (default 10%). Use for floor or wall tiling. Inputs: surface m², tile size, waste %. Returns tile count and surface ordered. See list_bundles for related 'construction' calculators.

Compute slope as percentage, angle in degrees, and ratio. Use for ramps, roofs, or terrain analysis. Inputs: rise, run. Returns slope% and angle°. See list_bundles for related 'construction' calculators.

Calculate staircase dimensions using Blondel formula. Returns: {step_height_cm, giron_cm, blondel, blondel_ok}. See list_bundles for related 'construction' calculators.

Compute thermal resistance R = thickness/lambda. Use for insulation specification (RT2020/RE2020). Inputs: thickness m, conductivity λ W/m·K. Returns R-value m²·K/W. See list_bundles for related 'construction' calculators.

Compute bricks or blocks needed for a wall including waste margin. Use for masonry projects. Inputs: wall dimensions, brick size, waste %. Returns brick count and pallets. See list_bundles for related 'construction' calculators.

Compute gravel volume (m³) and weight (tonnes) for a surface and depth. Use for paths, foundations, drainage. Inputs: area, depth, gravel density. Returns volume and weight. See list_bundles for related 'construction' calculators.

Compute electrical cable cross-section (mm²) per NF C 15-100. Use for residential wiring. Inputs: power kW, voltage, length, max voltage drop %. Returns required section. See list_bundles for related 'construction' calculators.

Compute wallpaper rolls needed for a room with pattern repeat factor. Use for renovation budget. Inputs: room dimensions, roll size, pattern repeat. Returns roll count. See list_bundles for related 'construction' calculators.

Compute Ohm's law: V=I·R. Solve for any of V, I, R given the other two. Use for electronics. Inputs: any 2 of (V volts, I amps, R ohms). Returns the third. See list_bundles for related 'science' calculators.

Compute force using Newton's second law F=m·a. Use for physics problems. Inputs: mass kg, acceleration m/s². Returns force in newtons. See list_bundles for related 'science' calculators.

Compute speed of sound in air at a given temperature. Use for physics or audio engineering. Formula: c=331.3+0.606·T_C. Inputs: temperature °C. Returns speed in m/s. See list_bundles for related 'science' calculators.

Compute dilution C1·V1=C2·V2. Solve for any unknown. Use for chemistry, lab work, pharmacy. Inputs: any 3 of (C1, V1, C2, V2). Returns the fourth. See list_bundles for related 'science' calculators.

Compute pH from H+ concentration or vice versa. Use for chemistry or aquarium care. Formula: pH=-log10[H+]. Inputs: pH or [H+] mol/L. Returns the missing value and acidity class. See list_bundles for related 'science' calculators.

Compute electrical power for single or three-phase circuits. Use for electrical engineering. Inputs: voltage, current, phase, power factor. Returns power kW and apparent power kVA. See list_bundles for related 'science' calculators.

Compute density, mass, or volume given the other two. ρ=m/V. Use for materials, chemistry, fluid dynamics. Inputs: any 2 of (mass, volume, density). Returns the third. See list_bundles for related 'science' calculators.

Compute remaining quantity after radioactive decay. Use for physics or carbon dating. Formula: N=N0·(0.5)^(t/half-life). Inputs: initial qty, half-life, elapsed time. Returns remaining qty. See list_bundles for related 'science' calculators.

Compute fuel cost for a journey. Use for trip budgeting or company expense. Inputs: distance km, consumption L/100km, fuel price €/L. Returns total cost and L used. See list_bundles for related 'auto-transport' calculators.

Compute reaction + braking distance by road condition (dry/wet/icy). Use for driver safety education. Inputs: speed km/h, reaction time s, road type. Returns total stopping distance m. See list_bundles for related 'auto-transport' calculators.

Compute electricity cost for an appliance. Use for energy budgeting. Inputs: power W, daily usage hours, kWh price. Returns daily/monthly/yearly cost. See list_bundles for related 'vie-quotidienne' calculators.

Compute the rent-to-income ratio. Use to assess housing affordability (rule of thumb: keep under 33%). Inputs: monthly rent, monthly gross income. Returns rent ratio % and verdict. See list_bundles for related 'immobilier' calculators.

Scale recipe ingredients up or down by a factor or new servings count. Use for cooking adjustments. Inputs: ingredients list, original servings, new servings. Returns scaled ingredient list. See list_bundles for related 'cuisine' calculators.

Compute swimming pool water volume in m³ and liters. Use for pool maintenance dosing. Inputs: shape, dimensions. Returns volume m³ and L. See list_bundles for related 'vie-quotidienne' calculators.

Estimate annual personal carbon footprint (tCO₂e). Use for sustainability awareness. Inputs: housing, transport, diet, lifestyle. Returns total emissions and breakdown. See list_bundles for related 'vie-quotidienne' calculators.

Compute restaurant tip following local custom (US 18-22%, FR included, JP no tip, etc.). Use when traveling. Inputs: bill, country. Returns recommended tip and total. See list_bundles for related 'vie-quotidienne' calculators.

Compute total curtain width using a fullness factor (1.5-3.0×). Use for window dressing. Inputs: window width m, fullness ratio. Returns total fabric width. See list_bundles for related 'vie-quotidienne' calculators.

Compute soil volume (m³) and number of bags needed for a garden bed. Use for gardening. Inputs: area, depth, bag volume. Returns m³ and bag count. See list_bundles for related 'vie-quotidienne' calculators.

Estimate moving volume (m³) by home type and contents. Use for moving company quotes. Inputs: home size, rooms, furniture density. Returns m³ and truck size recommendation. See list_bundles for related 'vie-quotidienne' calculators.

Compute flooring cost including waste margin. Use for renovation budget. Inputs: surface m², product price/m², waste %. Returns total cost and m² to order. See list_bundles for related 'vie-quotidienne' calculators.

Calculate US federal income tax for 2026 using progressive brackets with standard deduction. Returns: {gross_income, standard_deduction, taxable_income, federal_tax, effective_rate_pct, marginal_rate_pct, ...}. See list_bundles for related 'finance-us' calculators.

Calculate US FICA taxes (Social Security + Medicare) employee share for 2026. Returns: {gross_annual, social_security_taxable, social_security_tax, medicare_base_tax, medicare_additional_tax, medicare_total, ...}. See list_bundles for related 'finance-us' calculators.

Calculate US 401(k) contribution, employer match, and total retirement savings. Returns: {annual_salary, employee_contribution, employer_match, total_annual_contribution, catch_up_eligible, max_employee_limit}. See list_bundles for related 'finance-us' calculators.

Calculate US mortgage with PMI, property tax, and insurance estimates. Returns: {home_price, down_payment, loan_amount, monthly_pi, monthly_pmi, monthly_property_tax, ...}. See list_bundles for related 'finance-us' calculators.

Calculate US capital gains tax — short-term (ordinary rates) or long-term (preferential rates). Returns: {tax, gain_type}. See list_bundles for related 'finance-us' calculators.

Calculate US Child Tax Credit for 2026 with phase-out based on AGI. Returns: {agi, base_credit, credit_reduction, final_credit}. See list_bundles for related 'finance-us' calculators.

Calculate US student loan repayment under standard, graduated, or income-driven plans. Returns: {loan_balance}. See list_bundles for related 'finance-us' calculators.

Estimate US bi-weekly net paycheck after federal/state withholding and FICA. Returns: {annual_salary, fica_biweekly, net_biweekly, net_annual_estimate}. See list_bundles for related 'finance-us' calculators.

Estimate annual US property tax by state using effective tax rates. Returns: {home_value, effective_rate_pct, annual_property_tax, monthly_property_tax}. See list_bundles for related 'finance-us' calculators.

Compute US state income tax for a chosen state. Use for paycheck planning across states. Inputs: state, gross income, filing status. Returns state tax due and effective rate. See list_bundles for related 'finance-us' calculators.

Calculate UK income tax for 2025/26 using HMRC progressive brackets with personal allowance taper. Returns: {gross_income, personal_allowance, taxable_income, income_tax, effective_rate_pct, marginal_rate_pct}. See list_bundles for related 'finance-uk' calculators.

Calculate UK National Insurance contributions (Class 1 employee) for 2025/26. Returns: {annual_salary, ni_annual, ni_monthly, effective_rate_pct}. See list_bundles for related 'finance-uk' calculators.

Calculate UK student loan repayments based on plan type and salary. Returns: {annual_salary, repayment_rate_pct, annual_repayment, monthly_repayment}. See list_bundles for related 'finance-uk' calculators.

Calculate UK VAT — convert between net (ex-VAT) and gross (inc-VAT) amounts. Returns: {amount_net, amount_gross, vat_amount, vat_rate_pct}. See list_bundles for related 'finance-uk' calculators.

Compute UK Council Tax based on property band and local authority rate. Use for UK residents and home buyers. Inputs: band (A-H), local authority. Returns annual and monthly council tax. See list_bundles for related 'finance-uk' calculators.

Calculate Moroccan income tax (IR) on annual net taxable income (SNI) using the CGI Art. 73 progressive scale, minus the family-charge tax reduction. Returns: {annual_income_mad, taxable_income, family_deduction, income_tax_before_family_reduction_mad, income_tax_mad, effective_rate_pct, marginal_rate_pct, brackets}. See list_bundles for related 'finance-afrique-quebec' calculators.

Calculate Moroccan CNSS contributions (employee and employer shares). Returns: {gross_monthly_mad, employee, employer, pension_ceiling_mad}. See list_bundles for related 'finance-afrique-quebec' calculators.

Compute Moroccan VAT (TVA) — convert between HT and TTC. Use for invoicing in Morocco. Inputs: amount, rate (20/14/10/7), mode (ht/ttc). Returns HT, TTC, tax amount. See list_bundles for related 'finance-afrique-quebec' calculators.

Calculate Moroccan property income tax (profit foncier / revenus fonciers). Returns: {annual_rent_mad, taxable_income, income_tax_mad, effective_rate_pct, marginal_rate_pct}. See list_bundles for related 'finance-afrique-quebec' calculators.

Calculate Senegalese income tax (IR) on annual taxable income using the CGI Art. 173 progressive scale in XOF, before the family-charge reduction (Art. 174). Returns: {annual_income_xof, income_tax_xof, income_tax_capped_xof, effective_rate_pct, marginal_rate_pct, brackets}. See list_bundles for related 'finance-afrique-quebec' calculators.

Calculate Senegalese social contributions (CSS/IPRES) for employee and employer. Returns: {gross_monthly_xof, employee, employer, ipres_ceiling_monthly_xof}. See list_bundles for related 'finance-afrique-quebec' calculators.

Compute Senegalese VAT (TVA) — 18% standard rate. Use for invoicing in Senegal. Inputs: amount, mode (ht/ttc). Returns HT, TTC, tax amount. See list_bundles for related 'finance-afrique-quebec' calculators.

Calculate Quebec provincial income tax (Revenu Québec) with the basic personal amount credited at the lowest rate. Excludes employment-specific credits (QPP/QPIP/EI, worker deduction): for a salary use calculate_canada_combined_tax. Returns: {income_cad, basic_personal_amount, basic_personal_credit, taxable_income, provincial_tax, effective_rate_pct, marginal_rate_pct, ...}. See list_bundles for related 'finance-afrique-quebec' calculators.

Calculate Canadian federal income tax (CRA) with the basic personal amount credited at the lowest rate (before any Quebec abatement). Returns: {income_cad, basic_personal_amount, basic_personal_credit, taxable_income, federal_tax, effective_rate_pct, marginal_rate_pct, ...}. See list_bundles for related 'finance-afrique-quebec' calculators.

Calculate combined Quebec + federal income tax on an employment income with the Quebec federal abatement (16.5%), single, no dependents (same engine as /api/v1/salaire-net?pays=qc). Returns: {income_cad, quebec_provincial_tax, federal_gross_tax, federal_abatement_qc, federal_net_tax, total_combined_tax, ...}. See list_bundles for related 'finance-afrique-quebec' calculators.

Calculate Quebec Pension Plan (RRQ) contributions for employee. Returns: {gross_annual_cad, rrq_base_earnings, rrq_contribution_tier1, rrq_additional_earnings, rrq_contribution_tier2, total_rrq_contribution, ...}. See list_bundles for related 'finance-afrique-quebec' calculators.

Calculate Canadian Employment Insurance (EI) premiums for Quebec and non-Quebec residents. Returns: {gross_annual_cad, max_insurable_earnings, insurable_earnings, employee_rate_pct, employee_premium}. See list_bundles for related 'finance-afrique-quebec' calculators.

Calculate French notary fees (frais de notaire) for a real estate purchase. Returns: {price, droits_mutation, emoluments_notaire, frais_divers, total_frais, total_pct}. See list_bundles for related 'finance-france' calculators.

Calculate French inheritance tax (droits de succession) based on relationship and amount. Returns: {amount, abatement, taxable_base, tax_due, effective_rate_pct, marginal_rate_pct}. See list_bundles for related 'finance-france' calculators.

Estimate French child support (pension alimentaire) based on income, custody and number of children. Returns: {income, rate_pct, monthly_support, annual_support}. See list_bundles for related 'finance-france' calculators.

Compute French property capital gains tax (plus-value immobilière) including duration abatements. Use for sellers of secondary residence. Inputs: purchase price, sale price, years held, work cost. Returns tax due, social charges, net gain. See list_bundles for related 'finance-france' calculators.

Calculate French auto-entrepreneur (micro-enterprise) net income and social charges. Returns: {social_charges_rate_pct, social_charges, abatement_fiscal_pct, taxable_income_approx, net_before_tax, cfe_estimate_eur}. See list_bundles for related 'finance-france' calculators.

Estimate French prime d'activité monthly amount (CAF benefit). Use for low-income workers checking eligibility. Inputs: net monthly salary, household composition. Returns estimated benefit and eligibility note. See list_bundles for related 'finance-france' calculators.

Estimate French housing aid (APL — Aide Personnalisee au Logement). Returns: {rent, rent_ceiling, estimated_apl, note}.

Estimate French basic retirement pension (retraite de base Assurance Vieillesse). Returns: {average_salary_best25, annual_pension, max_monthly_pension, prorata_pct}. See list_bundles for related 'finance-france' calculators.

Calculate French severance pay for rupture conventionnelle or licenciement. Returns: {monthly_salary, years_first_10, years_above_10, gross_indemnite, note}. See list_bundles for related 'finance-france' calculators.

Estimate French unemployment benefit (ARE — Aide au Retour a l'Emploi). Returns: {daily_ref_salary, daily_are, monthly_are_estimate, min_daily, max_daily_75pct_sjr}. See list_bundles for related 'finance-france' calculators.

Estimate net income from portage salarial (freelance via umbrella company). Returns: {portage_management_fee_10pct, social_charges_45pct, net_monthly, net_annual_estimate, net_ratio_pct}. See list_bundles for related 'finance-france' calculators.

Calculate Belgian personal income tax (IPP/PB) on an annual taxable base using the income-year 2026 (tax year 2027) progressive brackets, minus the tax-free allowance reduction (SPF method). Returns: {income, tax_free_amount, tax_free_reduction, taxable_base, income_tax, effective_rate_pct, marginal_rate_pct, ...}. See list_bundles for related 'finance-belgique' calculators.

Convert Belgian gross monthly salary to net salary (estimate: employee ONSS 13.07% + annual personal income tax, single, no municipal surcharge; same engine as /api/v1/salaire-net?pays=be). Returns: {gross_monthly, social_cotisations_13_07pct, special_social_contribution, professional_withholding_tax, net_monthly, net_annual, ...}. See list_bundles for related 'finance-belgique' calculators.

Calculate Belgian VAT — convert between HT and TTC. Returns: {amount_ht, amount_ttc, vat_amount, vat_rate}. See list_bundles for related 'finance-belgique' calculators.

Calculate Belgian self-employed social contributions (cotisations INASTI). Returns: {annual_income, tier1_up_to_73850_at_20_5pct, tier2_73850_to_108785_at_14_16pct, tier3_above_108785, total_contributions, effective_rate_pct}. See list_bundles for related 'finance-belgique' calculators.

Calculate Belgian meal voucher (cheque-repas / maaltijdcheque) benefit. Returns: {face_value_per_voucher, employer_contribution_per_voucher, employee_contribution_per_voucher, monthly_total_vouchers, monthly_employer_cost, monthly_employee_contribution, ...}. See list_bundles for related 'finance-belgique' calculators.

Estimate Belgian retirement pension based on career years and average salary. Use for retirement planning in Belgium. Inputs: years of contribution, average salary, status (employee/self-employed). Returns monthly pension estimate. See list_bundles for related 'finance-belgique' calculators.

Calculate Belgian benefit-in-kind for company car (avantage de toute nature voiture). Returns: {co2_reference, benefit_rate_pct, annual_taxable_benefit, monthly_taxable_benefit, estimated_monthly_tax_impact}. See list_bundles for related 'finance-belgique' calculators.

Compute Belgian donation tax (droits de donation) by region (Bruxelles/Flandre/Wallonie). Use for estate planning in Belgium. Inputs: region, amount, recipient relation. Returns tax due and effective rate. See list_bundles for related 'finance-belgique' calculators.

Calculate Swiss income tax — federal + estimated cantonal tax. Returns: {income, federal_tax, federal_marginal_rate_pct, cantonal_tax_estimate, cantonal_rate_pct, effective_rate_pct, ...}. See list_bundles for related 'finance-suisse' calculators.

Convert Swiss gross monthly salary to estimated net salary after employee social contributions (AVS/AI/APG 5.3% uncapped, AC 1.1% up to 148,200/year, LPP employee share by age when age is given). Income tax and LAMal health insurance are not withheld. Same engine as /api/v1/salaire-net?pays=ch. Returns: {gross_monthly, avs_ai_apg_5_3pct, ac_chomage_1_1pct, lpp_2e_pilier_10pct (LPP employee share, CHF/month), lamal_health_fixed (0), net_monthly, ...}. See list_bundles for related 'finance-suisse' calculators.

Compute Swiss VAT (TVA/MWST) — convert between net (HT) and gross (TTC). Use for invoicing or expense reimbursements in Switzerland. Inputs: amount, rate (8.1, 3.8, 2.6, 0). Returns HT, TTC, and tax amount. See list_bundles for related 'finance-suisse' calculators.

Calculate Swiss occupational pension (LPP / 2e pilier) contributions by age bracket. Returns: {eligible, note}. See list_bundles for related 'finance-suisse' calculators.

Calculate Swiss pillar 3a tax savings (3e pilier lie). Returns: {annual_contribution, net_cost_after_saving, max_employee_2026, max_self_employed_2026}. See list_bundles for related 'finance-suisse' calculators.

Calculate Swiss wealth tax (impot sur la fortune) by canton. Returns: {net_wealth, tax_free_threshold, taxable_wealth, wealth_tax_rate_pct, annual_wealth_tax, note}. See list_bundles for related 'finance-suisse' calculators.

Calculate Body Mass Index (BMI) and weight category. See list_bundles for related 'sante' calculators.

Calculate Basal Metabolic Rate using Mifflin-St Jeor equation. Returns: {bmr_kcal}. See list_bundles for related 'sante' calculators.

Calculate Total Daily Energy Expenditure from BMR and activity level. Returns: {tdee_kcal}. See list_bundles for related 'sante' calculators.

Estimate calories burned during physical activity using MET values. Returns: {calories_burned}. See list_bundles for related 'sante' calculators.

Estimate maximum heart rate using standard or age-adjusted formulas. Returns: {max_heart_rate}. See list_bundles for related 'sante' calculators.

Calculate heart rate training zones Z1-Z5, optionally using Karvonen method. See list_bundles for related 'sante' calculators.

Estimate ideal body weight using Lorentz and Devine formulas. Returns: {lorentz_kg, devine_kg, average_kg}. See list_bundles for related 'sante' calculators.

Estimate body fat percentage from BMI, age and sex using Deurenberg equation. Returns: {body_fat_pct}. See list_bundles for related 'sante' calculators.

Compute recommended daily fluid intake by weight, activity, and weather. Use for athletes and outdoor workers. Inputs: weight kg, activity hours, temperature °C. Returns L/day and electrolyte recommendation. See list_bundles for related 'sante' calculators.

Estimate 1 repetition maximum from submaximal lift using Epley, Brzycki and Lombardi formulas. Returns: {epley_1rm, brzycki_1rm, lombardi_1rm, average_1rm}. See list_bundles for related 'sante' calculators.

Calculate estimated due date using Naegele's rule and return trimester milestone dates

Calculate ovulation date and fertile window from last period and cycle length. Returns: {lmp, ovulation_date, fertile_window_start, fertile_window_end, next_period}. See list_bundles for related 'sante' calculators.

Estimate blood alcohol content (BAC) using Widmark formula. Returns: {bac_percent, legal_status_fr, estimated_sober_in_hours}. See list_bundles for related 'sante' calculators.

Calculate recommended daily protein intake based on weight and fitness goal. Returns: {rate_g_per_kg, daily_protein_g, calories_from_protein}. See list_bundles for related 'sante' calculators.

Calculate waist-to-hip ratio and cardiovascular risk level. Returns: {risk_threshold, cardiovascular_risk}. See list_bundles for related 'sante' calculators.

Calculate running pace (min/km) and speed (km/h) from distance and time. Returns: {pace_min_per_km, pace_formatted}. See list_bundles for related 'sport' calculators.

Compute VMA (Maximal Aerobic Speed) from a fitness test result. Use for runners building training plans. Inputs: test type (Cooper 12-min, Luc Léger), result. Returns VMA km/h and zones. See list_bundles for related 'sport' calculators.

Estimate VO2max from VMA (maximal aerobic speed). Use for runners assessing cardio fitness. Formula: VO2max ≈ VMA × 3.5. Inputs: VMA in km/h. Returns VO2max in mL/kg/min and fitness category. See list_bundles for related 'sport' calculators.

Predict race time for a target distance using Riegel formula. Returns: {predicted_time_minutes, predicted_formatted, predicted_pace_min_km}. See list_bundles for related 'sport' calculators.

Solve speed/distance/time — provide any 2 of 3 values to compute the missing one. Returns: {error}. See list_bundles for related 'sport' calculators.

Estimate cycling power output considering gradient, speed and total mass. Returns: {power_watts, watts_per_kg}. See list_bundles for related 'sport' calculators.

Calculate swimming pace per 100m and SWOLF efficiency estimate. Returns: {pace_per_100m_min, pace_formatted, swolf_estimate}. See list_bundles for related 'sport' calculators.

Calculate 6 running training zones as speed ranges based on VMA. Returns: {vma_kmh}. See list_bundles for related 'sport' calculators.

Generate target split times for a marathon, half-marathon, or other race. Use for race-day pacing. Inputs: target finish time, distance km. Returns 5K splits, halfway, and final pace. See list_bundles for related 'sport' calculators.

Calculate bicycle development in meters per pedal revolution. Returns: {gear_ratio, development_m, speed_at_90rpm_kmh}. See list_bundles for related 'sport' calculators.

Compute cycling gear ratio (braquet) and development per pedal turn. Use for road cycling gear analysis. Inputs: chainring teeth, sprocket teeth, wheel diameter mm. Returns ratio and meters per pedal turn. See list_bundles for related 'sport' calculators.

Generate a full 1RM-to-12RM repetition table from a known lift using Epley formula. Returns: {input_weight, input_reps, estimated_1rm}. See list_bundles for related 'sport' calculators.

Calculate days, weeks, approximate months and working days between two dates. Returns: {weeks, months_approx, working_days}. See list_bundles for related 'temps-rh' calculators.

Count working days Mon-Fri between two dates with optional French public holiday exclusion. Returns: {working_days, public_holidays_excluded}. See list_bundles for related 'temps-rh' calculators.

Add two time durations and return the total in hours and minutes. See list_bundles for related 'temps-rh' calculators.

Calculate French overtime pay: first 8h at +25%, beyond 8h at +50% (weekly threshold 35h). Returns: {hours_at_25pct, hours_at_50pct, pay_25pct_zone, pay_50pct_zone, total_overtime_pay, extra_vs_normal}. See list_bundles for related 'temps-rh' calculators.

Calculate night shift pay (21h-6h) with configurable premium percentage. Returns: {night_hourly_rate, total_pay, premium_earned}. See list_bundles for related 'temps-rh' calculators.

Calculate exact age in years, months and days from a birth date. Returns: {today, age_years, age_months, age_days, total_days_lived, days_to_next_birthday}. See list_bundles for related 'temps-rh' calculators.

Compute current UTC offset for a timezone, accounting for DST. Use for scheduling and date math. Inputs: timezone (IANA name). Returns UTC offset and DST status. See list_bundles for related 'temps-rh' calculators.

Calculate part-time work percentage and optional pro-rata salary. Returns: {percentage, prorata_salary}. See list_bundles for related 'temps-rh' calculators.

Estimate retirement date from birth date and country legal retirement age. Returns: {retirement_age, retirement_date, years_remaining, already_retired, note}. See list_bundles for related 'temps-rh' calculators.

Calculate French paid leave (congés payés): 2.5 days/month, max 25 working days/year. Returns: {accrual_per_month, accrued_days, capped_at_max, max_annual_days, days_to_max, months_to_max}. See list_bundles for related 'temps-rh' calculators.

Calculate total floor area and Carrez habitable area from a list of rooms. Returns: {rooms, total_area_m2, carrez_area_m2, note}. See list_bundles for related 'construction' calculators.

Calculate roof surface area from building footprint and slope angle. Returns: {rafter_length_m, net_roof_area_m2, with_5pct_overhang_m2}. See list_bundles for related 'construction' calculators.

Calculate plaster volume and weight for a given surface and thickness. Returns: {area_m2, volume_m3, weight_kg, bags_25kg}. See list_bundles for related 'construction' calculators.

Calculate max bending moment and shear for a beam under uniform distributed load. Returns: {load_kN_per_m, max_moment_kNm, max_shear_kN, note}. See list_bundles for related 'construction' calculators.

Compute excavation volume (m³) and truck loads needed for a foundation, pool, or trench. Use for construction. Inputs: length, width, depth (m), bulking factor. Returns m³ to remove and 8m³-truck count. See list_bundles for related 'construction' calculators.

Calculate kinetic (½mv²), potential (mgh), mass-energy (E=mc²), or work (F·d). Returns: {energy_joules, energy_kj, energy_kwh}. See list_bundles for related 'science' calculators.

Solve PV=nRT. Provide any 3 of: pressure_pa, volume_m3, moles, temperature_k. R=8.314. Returns: {error}. See list_bundles for related 'science' calculators.

Solve c=λ·f for EM waves. Provide wavelength or frequency. Also returns photon energy E=hf. See list_bundles for related 'science' calculators.

Calculate cable section from power, voltage, distance and max voltage drop. Returns: {current_a, allowed_drop_v, calculated_section_mm2, recommended_mm2}. See list_bundles for related 'science' calculators.

Calculate thermal R-value: R = thickness/lambda. Compare with RE2020 targets. Returns: {lambda_w_mk, r_value_m2KW, re2020_targets, walls_ok, roof_ok, floor_ok}. See list_bundles for related 'science' calculators.

Calculate car residual value: Y1:-25%, Y2:-15%, Y3:-10%, Y4-5:-8%, Y6+:-5%. Returns: {residual_value, total_dep, pct_lost}. See list_bundles for related 'auto-transport' calculators.

Calculate fuel consumption in L/100km and MPG from distance and fuel used. Returns: {l_100km, mpg_us, mpg_uk, co2_g_km_petrol}. See list_bundles for related 'auto-transport' calculators.

French ecological malus 2026: CO2 g/km based tax on new vehicle registration. Returns: {malus_eur, threshold, max}. See list_bundles for related 'auto-transport' calculators.

French fiscal horsepower CV = (CO2/45) + (P_kW/40)^1.6. Returns: {cv_raw, cv_fiscaux}. See list_bundles for related 'auto-transport' calculators.

Estimate annual car insurance from vehicle value, driver age and bonus-malus. Returns: {annual_premium_eur, monthly_eur, note}. See list_bundles for related 'auto-transport' calculators.

Compute water bill from cubic meters consumed and tariff bands. Use for household budget. Inputs: m³ consumed, fixed fee, variable rate. Returns total bill. See list_bundles for related 'vie-quotidienne' calculators.

Compare salaries across countries using PPP (FR=0.79, US=1.0, UK=0.81, DE=0.77, CH=1.36, BE=0.80). Returns: {ppp_from, ppp_to, equivalent, ratio}. See list_bundles for related 'vie-quotidienne' calculators.

Estimate shipping cost from weight, distance and service (standard vs express). Returns: {cost_eur, formula, note}. See list_bundles for related 'vie-quotidienne' calculators.

Calculate weekly and annual laundry cost (electricity + water + detergent). Returns: {per_load_eur, weekly_eur, annual_eur}. See list_bundles for related 'vie-quotidienne' calculators.

Compare unit prices of grocery items — normalizes g→kg, mL/cL→L. Returns: {best_value, savings_vs_priciest}. See list_bundles for related 'vie-quotidienne' calculators.