MaCalculatriceEnLigne

io.github.tresor4kPublished by GitHub account tresor4kv0.4.0Updated Nov 2, 2026

Calculatrices francaises : salaire net, SMIC, impots, bareme kilometrique, TVA, conversions.

VerifiedStreamable HTTPWeb executableFinance Data & Analytics

Server details

Identifier: io.github.tresor4k/macalc-mcp
Transport: Streamable HTTP
Runtime: Web executable
Trust: Verified
Published: Sep 16, 2026

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Overview

AI-generated overview

Remote calculator server giving an assistant French tax, salary, VAT and loan tools plus hundreds of everyday math, conversion and finance calculators.

What you can do: Discover and dispatch calculators: list bundles, list a bundle's tools, and call any hosted calculator by name
French finance: income tax, gross-to-net salary, VAT, mortgage and other France-specific calculators
General finance: loans, compound and simple interest, break-even, margins, ROI, discounts, generic VAT, cost price, debt-to-income, inflation and purchasing power
Math: percentages, averages, geometry, equations, sequences, fractions, logarithms, combinatorics, trigonometry and base conversion
Unit conversions: temperature, distance, weight, volume, area, speed, pressure and data storage
When to use it: Useful when you want an assistant to run everyday numeric calculations with stated formulas and sources, especially French tax and salary figures, rather than estimating them itself. The wider catalog covers health, construction, science, cooking and travel calculators on demand.
Requirements: A remote MCP endpoint over streamable HTTP, or the npm wrapper run with npx or the Docker image for stdio-only clients. No API key or account is needed. The README states a rate limit of 1,000 calls per day.

Before you install

Results are third-party calculations, not professional tax or financial advice; verify figures against official sources before relying on them. The remote endpoint serves the full catalog while the local wrapper defaults to a smaller core profile. No credentials are requested.

Installation

In SourceWeft

Open MaCalculatriceEnLigne in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.tresor4k%2Fmacalc-mcp/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "macalculatriceenligne": {
      "type": "http",
      "url": "https://macalculatriceenligne.com/api/mcp"
    }
  }
}

README

macalc — Everyday Calculator MCP Server

[npm version] [license: MIT] [macalc MCP server]

A curated core of 15 well-scoped calculator tools — income tax (France, US, UK, Canada), gross-to-net salary, mortgage, compound interest, loans, VAT, percentages, BMI, TDEE — with on-demand access to the full macalc catalog of 446 calculators (22 categories, 8 countries' tax systems) through a discovery + dispatcher workflow. Free, no API key required.

Core tools (default profile)

Tool	What it does
`calculate_french_income_tax`	French income tax 2026 (Article 197 CGI, family quotient)
`calculate_french_salary`	French gross → net salary 2026 (cadre / non-cadre / civil servant)
`calculate_us_federal_tax`	US federal income tax 2026 (IRS brackets + standard deduction)
`calculate_uk_income_tax`	UK income tax 2025/26 (HMRC bands, allowance taper)
`calculate_canada_federal_tax`	Canadian federal income tax (CRA brackets + BPA)
`calculate_mortgage`	Monthly payment, total interest, amortization schedule
`calculate_compound_interest`	Lump-sum compound growth with yearly breakdown
`calculate_loan_payment`	Generic amortizing loan (term in months)
`calculate_percentage`	Percent of total / percent change / what-percent
`calculate_vat_generic`	Add or remove VAT/GST/sales tax at any rate
`calculate_bmi`	Body Mass Index + WHO category
`calculate_tdee`	Maintenance calories from BMR + activity level
`list_bundles`	Discover the 31 thematic bundles of the full catalog
`get_bundle_tools`	List the tools inside one bundle
`call_any_calculator`	Invoke any of the 446 hosted calculators by name

Need something not in the core (notary fees, concrete volume, VMA, pet food…)? list_bundles → get_bundle_tools(bundle_id) → call_any_calculator(tool_name, arguments).

Prefer the raw 446-tool listing? Set the env var MACALC_MCP_FULL=1.

Quick Start

Two install modes — pick whichever your MCP client supports.

Option A — Remote (Streamable HTTP, zero install)

For clients with native remote MCP support (Claude Desktop ≥ 0.8, Cursor, Windsurf, VS Code MCP, etc.)

json

{  "mcpServers": {    "macalc": {      "url": "https://macalculatriceenligne.com/api/mcp"    }  }}

{  "mcpServers": {    "macalc": {      "url": "https://macalculatriceenligne.com/api/mcp"    }  }}

Option B — Local stdio proxy (works everywhere)

For clients that only speak stdio, or sandboxed environments:

json

{  "mcpServers": {    "macalc": {      "command": "npx",      "args": ["-y", "macalc-mcp"]    }  }}

{  "mcpServers": {    "macalc": {      "command": "npx",      "args": ["-y", "macalc-mcp"]    }  }}

Or with Docker (tresor4k/macalc-mcp on Docker Hub):

json

{  "mcpServers": {    "macalc": {      "command": "docker",      "args": ["run", "-i", "--rm", "tresor4k/macalc-mcp"]    }  }}

{  "mcpServers": {    "macalc": {      "command": "docker",      "args": ["run", "-i", "--rm", "tresor4k/macalc-mcp"]    }  }}

That's it. No API key, no auth, no setup.

Note: Option A (remote URL) serves the full 446-tool catalog directly. Option B (this npm wrapper) serves the curated 15-tool core profile by default — lighter on your agent's context window — with the full catalog one dispatcher call away.

What's Inside — The Full Catalog

Finance (8 countries)

Country	Tools	Examples
🇫🇷 France	85+	Income tax (IR 2026), salary gross→net, VAT, mortgage, notary fees, inheritance, retirement, unemployment, auto-entrepreneur
🇧🇪 Belgium	35+	Precompte professionnel, bonus emploi, pension, cheques repas, droits donation
🇨🇭 Switzerland	30+	Federal + cantonal tax, AVS/LPP, LAMal, 3rd pillar, frontalier
🇨🇦 Canada/Quebec	25+	Federal + provincial tax, RRQ, RQAP, REER, CELI, TPS/TVQ
🇺🇸 USA	15+	Federal income tax, FICA, state tax, 401k, HSA
🇬🇧 UK	10+	Income tax, NI, SDLT, student loan repayment
🇲🇦 Morocco	10+	IR, CNSS, TVA
🇸🇳 Senegal	10+	IR, CSS, TVA

Health & Sport (50+ tools)

BMI, BMR (Mifflin/Harris-Benedict), TDEE, heart rate zones (Karvonen), 1RM (Epley/Brzycki), VMA (Cooper/Luc-Léger), VO2max, race prediction (Riegel), marathon/half pace, due date (3 methods), ovulation calendar, body fat (Navy method), daily calories, macros, hydration.

Math (60+ tools)

Percentages (increase/decrease/ratio), averages (weighted/geometric/harmonic), Pythagoras, area (triangle/circle/rectangle/trapezoid/polygon), volume (sphere/cylinder/cone/cube), perimeter, equations (1st/2nd degree), sequences (arithmetic/geometric), fractions, statistics (mean/median/mode/std dev), GCD/LCM, base conversion.

Construction (40+ tools)

Concrete volume & mix (B25 DTU 21), paint coverage, tile quantity, staircase dimensions (Blondel formula), insulation R-value, roof surface & slope, cable section (NF C 15-100), beam dimensioning (Eurocode 5), gravel/sand tonnage, wallpaper rolls, plasterboard sheets.

Science (25+ tools)

Ohm's law, Newton's laws, pH calculation, dilution (C1V1=C2V2), density, radioactive decay, speed of sound, ideal gas law, molar mass, concentration.

Conversions (40+ tools)

Temperature, distance, weight, volume, speed, pressure, energy, data storage, cooking units, shoe sizes, clothing sizes, currency.

Running & Cycling (35+ tools)

Pace calculator, VMA (6 test methods), VO2max, FTP, heart rate zones, race prediction, training plan, calorie burn, hydration needs, bike gear ratio, tire pressure.

Education (20+ tools)

GPA calculator (French bac/brevet system), weighted average, statistics, derivatives, combinatorics, probability distributions.

Real Estate (15+ tools)

Rental yield (gross/net/net-net), Pinel tax reduction, PTZ eligibility, DPE energy class, Carrez surface, notary fees by department, loan comparison.

Cooking & Nutrition (15+ tools)

Recipe nutrition calculator, baking conversions, glycemic load, caffeine intake, daily vitamins, unit conversions (cups/ml/oz).

Travel (10+ tools)

Luggage weight calculator, jet lag recovery, travel budget, voltage adapters, sun exposure time.

Animals (8+ tools)

Dog/cat food calculator, pet age converter (corrected formula), aquarium volume, breeding due date.

Astronomy (8+ tools)

Sunrise/sunset, moon phase, solar panel output, wind chill, heat index, carbon sequestration.

Textile (5+ tools)

Fabric yardage, knitting yarn calculator, ring/bra/hat size converters.

Exemples d'outils

Impôt sur le revenu : page web du calculateur correspondant à l'outil calculate_french_income_tax (barème IR 2026, quotient familial).
Salaire brut en net : page web du calculateur correspondant à l'outil calculate_french_salary (cadre, non-cadre, fonction publique).
Mensualité de prêt immobilier : page web du calculateur correspondant à l'outil calculate_mortgage (mensualité, intérêts totaux, tableau d'amortissement).

Technical Details

Property	Value
Endpoint	`https://macalculatriceenligne.com/api/mcp`
Transport	Streamable HTTP (stateless)
Protocol	MCP v1 (`@modelcontextprotocol/sdk ^1.27.1`)
Auth	None (free, no API key)
Rate limit	1,000 calls/day
Response format	Structured JSON with formula, source, reference URL
Discovery	`https://macalculatriceenligne.com/.well-known/mcp/server.json`

Example Usage

Ask your AI assistant:

"Calculate the French income tax on 45,000€ for a single person"

The assistant calls calculate_french_income_tax with {income: 45000, parts: 1} and returns:

json

{  "impot": 4611,  "taux_effectif": "10.2%",  "taux_marginal": "30%",  "tranches": [    {"min": 0, "max": 11624, "taux": "0%", "impot": 0},    {"min": 11624, "max": 29638, "taux": "11%", "impot": 1982},    {"min": 29638, "max": 45000, "taux": "30%", "impot": 2629}  ],  "source": "Article 197 CGI — Loi de finances 2026",  "reference_url": "https://macalculatriceenligne.com/finance/fiscalite/calcul-impots/"}

{  "impot": 4611,  "taux_effectif": "10.2%",  "taux_marginal": "30%",  "tranches": [    {"min": 0, "max": 11624, "taux": "0%", "impot": 0},    {"min": 11624, "max": 29638, "taux": "11%", "impot": 1982},    {"min": 29638, "max": 45000, "taux": "30%", "impot": 2629}  ],  "source": "Article 197 CGI — Loi de finances 2026",  "reference_url": "https://macalculatriceenligne.com/finance/fiscalite/calcul-impots/"}

All Tool Categories

Finance FR (85)     Finance BE (35)     Finance CH (30)Finance CA (25)     Finance US (15)     Finance UK (10)Finance MA (10)     Finance SN (10)     Health (30)Sport/Running (35)  Math (60)           Construction (40)Science (25)        Conversions (40)    Education (20)Real Estate (15)    Cooking (15)        Travel (10)Animals (8)         Astronomy (8)       Textile (5)Automotive (10)

Finance FR (85)     Finance BE (35)     Finance CH (30)Finance CA (25)     Finance US (15)     Finance UK (10)Finance MA (10)     Finance SN (10)     Health (30)Sport/Running (35)  Math (60)           Construction (40)Science (25)        Conversions (40)    Education (20)Real Estate (15)    Cooking (15)        Travel (10)Animals (8)         Astronomy (8)       Textile (5)Automotive (10)

Total: 446 tools (hosted catalog — counts per category are approximate)

License

MIT

Source: README.md at commit b6641a2

Tools

200

list_bundles

List Bundles

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.

Parameters_unused

get_bundle_tools

Get Bundle Tools

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

Parametersbundle_idrequired

calculate_french_income_tax

Calculate French Income Tax

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.

Parameterspartscoupleincomerequired

calculate_french_salary

Calculate French Salary

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.

Parametersstatusgross_monthlyrequired

calculate_french_vat

Calculate French VAT

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.

Parametersmoderateamountrequired

calculate_mortgage

Calculate Mortgage

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.

Parametersyearsrequiredprincipalrequiredannual_raterequiredwith_schedule

calculate_compound_interest

Calculate Compound Interest

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.

Parametersyearsrequiredprincipalrequiredannual_raterequiredcompounds_per_year

calculate_simple_interest

Calculate Simple Interest

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.

Parametersyearsrequiredprincipalrequiredannual_raterequired

calculate_loan_payment

Calculate Loan Payment

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

Parametersmonthsrequiredprincipalrequiredannual_raterequired

calculate_break_even

Calculate Break Even

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.

Parametersfixed_costsrequiredprice_per_unitrequiredvariable_cost_per_unitrequired

calculate_profit_margin

Calculate Profit Margin

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

Parameterscostrequiredrevenuerequired

calculate_roi

Calculate ROI

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.

Parametersinvestmentrequiredreturn_valuerequired

calculate_discount

Calculate Discount

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

Parametersdiscount_pctrequireddiscount2_pctoriginal_pricerequired

calculate_vat_generic

Calculate VAT Generic

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.

Parametersmoderaterequiredamountrequired

calculate_cost_price

Calculate Cost Price

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

Parameterslaborrequiredoverheadrequiredquantityrequiredraw_materialsrequired

calculate_debt_to_income

Calculate Debt To Income

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.

Parametersmonthly_debtrequiredmonthly_incomerequired

calculate_inflation_adjustment

Calculate Inflation Adjustment

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.

Parametersyearsrequiredamountrequiredinflation_raterequired

calculate_purchasing_power

Calculate Purchasing Power

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.

Parametersamountrequiredto_yearrequiredfrom_yearrequiredavg_inflation

calculate_percentage

Calculate Percentage

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

Parametersarequiredbrequiredoperationrequired

calculate_average

Calculate Average

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.

Parametersvaluesrequiredweights

calculate_pythagoras

Calculate Pythagoras

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

Parametersabc

calculate_area

Calculate Area

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.

Parametersd1d2sideshaperequiredwidthheightlengthradiussemi_majorsemi_minor

calculate_volume

Calculate Volume

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.

Parametersshaperequiredwidthheightlengthradiusbase_area

calculate_perimeter

Calculate Perimeter

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

Parameterssideshaperequiredwidthlengthradiusside_csemi_majorsemi_minor

calculate_gcd_lcm

Calculate GCD LCM

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

Parametersarequiredbrequired

calculate_equation

Calculate Equation

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

Parametersarequiredbrequiredcdegreerequired

calculate_sequence

Calculate Sequence

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.

Parametersnrequiredtyperequiredcommonrequiredfirst_termrequired

calculate_fraction

Calculate Fraction

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

Parametersden1requiredden2num1requirednum2operationrequired

calculate_logarithm

Calculate Logarithm

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

Parametersbasevaluerequired

calculate_factorial_permutation

Calculate Factorial Permutation

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

Parametersnrequiredr

calculate_trigonometry

Calculate Trigonometry

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.

Parametersfuncrequiredunitvaluerequired

calculate_base_converter

Calculate Base Converter

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

Parametersvaluerequiredto_baserequiredfrom_baserequired

convert_temperature

Convert Temperature

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.