BoringToolsKit MCP Server

Install BoringToolsKit MCP server

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

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

{
  "mcpServers": {
    "boringtoolskit": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://boringtoolskit.com/mcp"
      ]
    }
  }
}

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

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

Context tax

Connecting this server adds ~4,012 tokens of tool definitions to every model turn (moderate, 36 tools). Measured 2026-10-19 via its hosted endpoint; o200k tokenizer, worst case for clients that load all tools up front. How we measure

Input prices as of 2026-10-06. Excludes your own prompt and output.

Tools (36)

• mortgage_payment195 tok

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

• maintenance_calories176 tok

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

• tip_bill_split171 tok

  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.

• growing_degree_day161 tok

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

• bmr_tdee149 tok

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

• calorie145 tok

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

• dividend_reinvestment144 tok

  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.

• compound_interest142 tok

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

• key_transposition136 tok

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

• boat_loan136 tok

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

• discount_percent_off129 tok

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

• insulation125 tok

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

• square_footage120 tok

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

• roofing118 tok

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

• emergency_fund115 tok

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

• auto_loan114 tok

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

• va_mortgage111 tok

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

• percentage104 tok

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

• apy104 tok

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

• protein_molecular_weight104 tok

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

• cagr100 tok

  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.

• savings_growth97 tok

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

• margin_of_error94 tok

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

• win_loss_percentage88 tok

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

• youtube_revenue88 tok

  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.

• rule_of_7282 tok

  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.

• bmi81 tok

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

• combinations80 tok

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

• ceiling_tile80 tok

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

• audio_time_stretch79 tok

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

• simple_interest78 tok

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

• pressure77 tok

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

• slope76 tok

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

• gross_rent_multiplier74 tok

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

• remainder70 tok

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

• budget_50_30_2067 tok

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

Security signals

92/100 — no known issues found as of 2026-10-19, from the checks below. This is not a guarantee of safety; review what a server can do before connecting it.

Scan it yourself before installing with vectra-guard, the open-source agent security CLI. Scoring rules

Freshness

Active — last maintenance signal 4d ago. The newest of the signals below sets the band.

1. Last commit (default branch)

   2026-10-13 · 5d ago · GitHub

2. Latest release

   no data · GitHub

3. Package published

   no data · npm/PyPI

4. Registry entry updated

   2026-10-14 · 4d ago · official registry · v1.0.0

How it compares in AI & LLM Tools

Against the most-starred ai & llm tools servers we index. Token cost is per model turn, measured from each server's live tool list.