BoringToolsKit

io.github.roadtogideon222-bytePublished by GitHub account roadtogideon222-bytev1.0.0Updated Oct 25, 2026

36 free private calculator tools for Claude. No accounts, no data leaves your session.

VerifiedStreamable HTTPWeb executableLocation & LifestyleFinanceData & Analytics

Overview

AI-generated overview

A free remote MCP server of 36 read-only calculators for money, health, home projects and everyday math, returning numbers only.

What you can do
Compute loans and interest: mortgage, VA, auto, boat/RV payments, compound and simple interest, savings growth, APY, CAGR, rule of 72, dividend reinvestment, emergency fund and 50/30/20 budget splits. Work out everyday money math: bill splitting with tip, stacked discounts, percentages, gross rent multiplier and YouTube revenue estimates. Estimate health figures: BMI, BMR/TDEE, calorie needs and maintenance calories. Handle home and DIY measurements: square footage, roofing, ceiling tiles, insulation savings, degree days, slope and pressure. Solve general math and misc: remainder, combinations, margin of error, win/loss percentage, protein molecular weight, key transposition and audio time.
When to use it
Useful when you want quick, deterministic numeric answers inside a chat without opening a separate calculator site, such as comparing loan payments, checking a tip split, sizing a home project, or sanity-checking a percentage or growth figure.
Requirements
A remote MCP client that supports Streamable HTTP; the endpoint is added by URL in the client's connector or config. No account, API key, header or environment variable is required, and no local runtime is needed.
Before you install
All tools are described as read-only and the server reports no accounts and no third-party calls, but calculations are sent to a remote endpoint, so treat inputs as leaving your machine. Results are estimates for planning, not financial, medical or professional advice; verify figures before acting on them.

Installation

In SourceWeft

  1. Open BoringToolsKit in the dashboard and add it to a workspace.
  2. 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.roadtogideon222-byte%2Fboringtoolskit/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": {
    "boringtoolskit": {
      "type": "http",
      "url": "https://boringtoolskit.com/mcp"
    }
  }
}

README

BoringToolsKit

MCP server for free, private calculators: 36 tools that compute payments, APY, budgets, home projects, and everyday math directly in Claude with no accounts and no data leaving your session.

BoringToolsKit is a free collection of private, no-signup browser calculators and everyday tools for money, home, school, and work, built for anyone who wants instant answers without accounts or uploads.

Official site: https://boringtoolskit.com

Tools

ToolDescription
tip_bill_splitSplit a bill across a group after tax, tip, and optional rounding. Returns each person's share, the tip, the effective tip rate, and the collected total.
discount_percent_offCompute the final checkout total after stacked percentage discounts, a fixed coupon, and a tax assumption. Sequential discounts are NOT additive.
bmiCalculate body mass index and category from weight and height in US units.
bmr_tdeeEstimate basal metabolic rate (Mifflin-St Jeor) and total daily energy expenditure from age, weight, height, sex, and an activity multiplier.
mortgage_paymentEstimate the full monthly housing payment (principal, interest, tax, insurance, PMI, HOA) and the total interest over the term. Requires a positive home price.
auto_loanEstimate a monthly auto-loan payment from price, down payment, trade-in, term, and APR.
compound_interestGrow a balance with compound interest and optional monthly contributions. Returns future value, total contributed, and interest earned.
savings_growthProject the future value of a lump-sum investment (optionally with monthly additions), including interest earned.
simple_interestCompute simple interest, total value, and a comparison to annual compounding.
calorieEstimate BMR and total daily energy expenditure using Mifflin-St Jeor, from weight/height in US units.
percentageSolve percentage problems: what is X% of Y, X is what % of Y, or the % change from X to Y.
square_footageCompute total area (and with-waste area) from up to two rectangular spaces, plus square yards, square metres, and acres.
apyCompute annual percentage yield from a nominal rate and a compounding frequency, plus the one year interest and ending balance on an example deposit.
win_loss_percentageCompute a winning percentage from wins, losses, and ties, where ties count as half a win.
slopeCompute slope from rise and run as degrees, percent grade, and the rise to run ratio. Run must be above zero.
rule_of_72Estimate the doubling time of money at a fixed rate using the rule of 72, plus the exact doubling time from the compound formula. Rate must be between 0 and 30 percent.
cagrCompute the compound annual growth rate connecting a starting and an ending value over a number of years, with total return percent and absolute change.
remainderCompute the remainder and floored quotient of a division. Works for decimal inputs, not just integers.
combinationsCompute the number of distinct combinations, n choose r, using a multiplicative form that avoids factorial overflow.
margin_of_errorCompute the margin of error for a survey sample at the 90, 95, or 99 percent confidence level, assuming maximum variance proportions.
va_mortgageMonthly VA loan payment including the funding fee, with no PMI. Returns the financed amount, payment, and total interest.
gross_rent_multiplierGross rent multiplier for a rental property: price divided by annual gross rent. Lower means more rent per dollar of price.
emergency_fundEmergency fund target (expenses times coverage months), the remaining gap versus current savings, and months to close the gap at a fixed monthly contribution.
dividend_reinvestmentCompound a portfolio with a constant dividend yield and price growth, reinvesting monthly and optionally adding deposits. Returns ending value, total contributed, and dividends reinvested.
budget_50_30_20Split monthly after-tax income by the 50/30/20 rule into needs, wants, and savings or debt paydown.
growing_degree_dayAccumulate growing, heating, or cooling degree days (Fahrenheit basis) from daily high, low, a base threshold, and a day count. Includes Celsius-basis totals.
insulationU-value of an insulation upgrade and an estimated annual heating saving from conduction, using heating degree days, area, kWh conversion, and utility cost.
roofingRoof area from footprint and pitch, with waste allowance, roofing squares, and approximate shingle bundles (3 per square).
maintenance_caloriesDaily maintenance calories (TDEE) from Mifflin-St Jeor BMR and an activity level, using metric inputs.
protein_molecular_weightEstimate a protein chain molecular weight in Da and kDa from residue count and average residue mass, plus peptide bond count.
key_transpositionTranspose a musical key and report the number of semitone steps upward between two keys.
audio_time_stretchCompute the new duration of audio at a playback speed, plus the percent time change.
youtube_revenueEstimated YouTube Adsense revenue from monthly views and RPM, with an annual figure and a 30 percent RPM swing range. RPM defaults to 2 when omitted.
ceiling_tileCount 2x2 ft ceiling tiles needed for a rectangular room, with room area and a 5 percent cut-waste reminder.
boat_loanBoat or RV loan payment with optional sales tax, down payment, and trade-in, including amount financed and total interest.
pressureCompute pressure in Pascals, kilopascals, and psi from a force in newtons over an area in square metres.

Every tool carries readOnlyHint: true, so the server computes and returns numbers only. It never writes, never calls out to third parties, and never asks for an account.

Installation

Remote MCP (recommended, no install)

Add to claude_desktop_config.json, mcp.json, or your client's connector settings:

json
{  "mcpServers": {    "boringtoolskit": {      "url": "https://boringtoolskit.com/mcp"    }  }}

Streamable HTTP transport, no authentication (the tools are public data). Works in Claude Desktop, Claude Code, Cursor, and any MCP client supporting remote servers.

MCP endpoint

  • URL: https://boringtoolskit.com/mcp
  • Transport: Streamable HTTP
  • Protocol: 2024-11-05 and 2025-06-18 tested
  • Auth: none required (public read-only calculator tools)

What's inside the site

The website ships 850+ lightweight browser tools that run entirely client-side. Nothing is uploaded, nothing requires an account:

  • Money: loan/mortgage/payoff calculators, tip splitters, discount and tax calculators, salary and freelance rate tools
  • Home: paint, flooring, BTU, energy-cost and DIY measurement calculators
  • School: GPA calculators, grade trackers, unit converters, study timers
  • Work: timesheet and invoice calculators, text utilities, date and timezone tools

Privacy-first by design

Links

Source: README.md at commit 4c91c5f

Tools

36

tip_bill_split

Split a Bill with Tip and Tax

Split a bill across a group after tax, tip, and optional rounding. Returns each person's share, the tip, the effective tip rate, and the collected total.

ParameterstaxrequiredpeoplerequiredtipPctrequiredsubtotalrequiredtipOnTaxroundMode

discount_percent_off

Discount Price Calculator

Compute the final checkout total after stacked percentage discounts, a fixed coupon, and a tax assumption. Sequential discounts are NOT additive.

ParameterscoupontaxPctdiscount1discount2originalPricerequired

bmi

Body Mass Index Calculator

Calculate body mass index and category from weight and height in US units.

ParametersheightFtrequiredheightInweightLbrequired

bmr_tdee

BMR and TDEE Estimator

Estimate basal metabolic rate (Mifflin-St Jeor) and total daily energy expenditure from age, weight, height, sex, and an activity multiplier.

ParametersagerequiredsexrequiredactivityrequiredheightCmrequiredweightKgrequired

mortgage_payment

Monthly Mortgage Payment Estimator

Estimate the full monthly housing payment (principal, interest, tax, insurance, PMI, HOA) and the total interest over the term. Requires a positive home price.

Parametersaprhoapmitaxdowntermpricerequiredinsurance

auto_loan

Auto Loan Payment Calculator

Estimate a monthly auto-loan payment from price, down payment, trade-in, term, and APR.

Parametersaprdowntermpricerequiredtrade

compound_interest

Compound Interest Calculator

Grow a balance with compound interest and optional monthly contributions. Returns future value, total contributed, and interest earned.

Parametersrateyearstimingcontribcompoundprincipalrequired

savings_growth

Savings Growth Projector

Project the future value of a lump-sum investment (optionally with monthly additions), including interest earned.

ParametersrateyearsamountrequiredcontribMonthly

simple_interest

Simple Interest Calculator

Compute simple interest, total value, and a comparison to annual compounding.

Parametersraterequiredyearsrequiredprincipalrequired

calorie

Daily Calorie Needs Estimator

Estimate BMR and total daily energy expenditure using Mifflin-St Jeor, from weight/height in US units.

ParametersagesexactivityheightFtrequiredheightInweightLbrequired

percentage

Percentage Calculator

Solve percentage problems: what is X% of Y, X is what % of Y, or the % change from X to Y.

Parametersmodeval1requiredval2required

square_footage

Square Footage Calculator

Compute total area (and with-waste area) from up to two rectangular spaces, plus square yards, square metres, and acres.

Parameterswastewidthrequiredlengthrequiredwidth2length2

apy

APY Calculator

Compute annual percentage yield from a nominal rate and a compounding frequency, plus the one year interest and ending balance on an example deposit.

Parametersraterequireddepositrequiredcompoundrequired

win_loss_percentage

Win Loss Percentage Calculator

Compute a winning percentage from wins, losses, and ties, where ties count as half a win.

Parameterstieswinsrequiredlossesrequired

slope

Slope and Angle Calculator

Compute slope from rise and run as degrees, percent grade, and the rise to run ratio. Run must be above zero.

Parametersrunrequiredriserequired

rule_of_72

Rule of 72 Doubling Time

Estimate the doubling time of money at a fixed rate using the rule of 72, plus the exact doubling time from the compound formula. Rate must be between 0 and 30 percent.

Parametersraterequired

cagr

CAGR Calculator

Compute the compound annual growth rate connecting a starting and an ending value over a number of years, with total return percent and absolute change.

Parametersendrequiredstartrequiredyearsrequired

remainder

Division Remainder Calculator

Compute the remainder and floored quotient of a division. Works for decimal inputs, not just integers.

Parametersarequiredbrequired

combinations

Combinations Calculator

Compute the number of distinct combinations, n choose r, using a multiplicative form that avoids factorial overflow.

Parametersnrequiredrrequired

margin_of_error

Margin of Error Calculator

Compute the margin of error for a survey sample at the 90, 95, or 99 percent confidence level, assuming maximum variance proportions.

Parametersnrequiredconfidence

va_mortgage

VA Loan Payment Calculator

Monthly VA loan payment including the funding fee, with no PMI. Returns the financed amount, payment, and total interest.

Parametersaprrequiredfeetermrequiredprincipalrequired

gross_rent_multiplier

Gross Rent Multiplier Calculator

Gross rent multiplier for a rental property: price divided by annual gross rent. Lower means more rent per dollar of price.

Parametersrentrequiredpricerequired

emergency_fund

Emergency Fund Target Calculator

Emergency fund target (expenses times coverage months), the remaining gap versus current savings, and months to close the gap at a fixed monthly contribution.

Parameterssavedmonthsrequiredmonthlyexpensesrequired

dividend_reinvestment

Dividend Reinvestment Calculator

Compound a portfolio with a constant dividend yield and price growth, reinvesting monthly and optionally adding deposits. Returns ending value, total contributed, and dividends reinvested.

ParametersyearsrequiredgrowthrequiredinitialrequiredyieldPctrequiredcontribution

budget_50_30_20

50/30/20 Budget Split Calculator

Split monthly after-tax income by the 50/30/20 rule into needs, wants, and savings or debt paydown.

Parametersincomerequired

growing_degree_day

Growing Degree Day Calculator

Accumulate growing, heating, or cooling degree days (Fahrenheit basis) from daily high, low, a base threshold, and a day count. Includes Celsius-basis totals.

Parametersbaserequireddaysrequiredmodetmaxrequiredtminrequired

insulation

Insulation Savings Estimator

U-value of an insulation upgrade and an estimated annual heating saving from conduction, using heating degree days, area, kWh conversion, and utility cost.

Parametersr1requiredr2areacost

roofing

Roofing Material Estimator

Roof area from footprint and pitch, with waste allowance, roofing squares, and approximate shingle bundles (3 per square).

Parametersrisewastewidthrequiredlengthrequired

maintenance_calories

Maintenance Calories Estimator

Daily maintenance calories (TDEE) from Mifflin-St Jeor BMR and an activity level, using metric inputs.

ParametersagerequiredsexrequiredactivityrequiredheightCmrequiredweightKgrequired

protein_molecular_weight

Protein Molecular Weight Calculator

Estimate a protein chain molecular weight in Da and kDa from residue count and average residue mass, plus peptide bond count.

ParametersresiduesrequiredavgResidueMassrequired

key_transposition

Musical Key Transposition Calculator

Transpose a musical key and report the number of semitone steps upward between two keys.

ParameterstoKeyrequiredfromKeyrequired

audio_time_stretch

Audio Time Stretch Calculator

Compute the new duration of audio at a playback speed, plus the percent time change.

Parametersspeedrequireddurationrequired

youtube_revenue

YouTube Revenue Estimator

Estimated YouTube Adsense revenue from monthly views and RPM, with an annual figure and a 30 percent RPM swing range. RPM defaults to 2 when omitted.

Parametersrpmviewsrequired

ceiling_tile

Ceiling Tile Calculator

Count 2x2 ft ceiling tiles needed for a rectangular room, with room area and a 5 percent cut-waste reminder.

Parameterswidthrequiredlengthrequired

boat_loan

Boat and RV Loan Calculator

Boat or RV loan payment with optional sales tax, down payment, and trade-in, including amount financed and total interest.

ParametersaprrequireddowntermrequiredpricerequiredtradetaxPct

pressure

Pressure Unit Converter

Compute pressure in Pascals, kilopascals, and psi from a force in newtons over an area in square metres.

Parametersarearequiredforcerequired

Version history

1
  1. v1.0.0LatestOct 14, 2026

Score

90% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

    Declare a license in the repository or the registry entry.