BoringToolsKit MCP Server

by roadtogideon222-byte Your server? Claim it

answering

BoringToolsKit is answering right now. Last checked 3 min ago. It exposes 36 tools. Last commit 13 Oct 2026.

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

Uptime history 12 days of history

12 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

279 ms

Response time

average over 24h

Stars

last commit 13 Oct 2026

What changed 1

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 15 October 2026. No other catalogue keeps this.

15 Oct a tool changed the parameters it asks for mortgage_payment

Nothing serious here today

Today is the operative word: we check BoringToolsKit every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 3 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add boringtoolskit --transport http https://boringtoolskit.com/mcp

Settings → Connectors → Add custom connector, then paste this address

https://boringtoolskit.com/mcp

~/.codex/config.toml

[mcp_servers.boringtoolskit]
url = "https://boringtoolskit.com/mcp"

.cursor/mcp.json

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

.vscode/mcp.json

{
  "servers": {
    "boringtoolskit": {
      "type": "http",
      "url": "https://boringtoolskit.com/mcp"
    }
  }
}

Available tools 36

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

mortgage

mortgage_payment

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

va_mortgage

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

apy

apy

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

audio

audio_time_stretch

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

auto

auto_loan

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

bmi

bmi

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

bmr

bmr_tdee

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

boat

boat_loan

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

budget

budget_50_30_20

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

cagr

cagr

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.

calorie

calorie

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

ceiling

ceiling_tile

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

combinations

combinations

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

compound

compound_interest

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

discount

discount_percent_off

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

dividend

dividend_reinvestment

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.

emergency

emergency_fund

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

gross

gross_rent_multiplier

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

growing

growing_degree_day

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

insulation

insulation

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

key

key_transposition

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

maintenance

maintenance_calories

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

margin

margin_of_error

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

percentage

percentage

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

pressure

pressure

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

protein

protein_molecular_weight

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

remainder

remainder

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

roofing

roofing

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

rule

rule_of_72

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.

savings

savings_growth

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

simple

simple_interest

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

slope

slope

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

square

square_footage

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

tip

tip_bill_split

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.

win

win_loss_percentage

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

youtube

youtube_revenue

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.

Endpoints

URL	Transport	State	Latency	Checked
https://boringtoolskit.com/mcp	streamable-http	answering	181 ms	3 min ago

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BoringToolsKit — questions

Answers built from our own checks of this server.

What can BoringToolsKit do?

It exposes 36 tools, read directly from the server on our last check. Among them: apy, audio_time_stretch, auto_loan, bmi, bmr_tdee, boat_loan and 30 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is BoringToolsKit working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 279 ms. The bar chart above shows every period we have measured.

How do I connect BoringToolsKit?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does BoringToolsKit need an API key?

No. BoringToolsKit completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 36 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is BoringToolsKit?

It answers our handshake in 279 ms on average, which is faster than 60% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is BoringToolsKit open source?

We cannot say either way: 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.