Summary
Exposes five calculation tools via MCP: a safe expression evaluator supporting functions like sqrt, sin, and log with constants and variables; a unit converter covering length, weight, temperature, data, time, and speed; a statistics calculator for mean, median, variance, standard deviation, and correlation; a number formatter for currency, percentage, scientific notation, and different bases; and a percentage calculator for tips, discounts, and markup. Runs as a Node.js stdio server. Reach for this when you need Claude to handle numerical operations beyond simple arithmetic, whether converting 100 km/h to mph, calculating summary statistics on a dataset, or formatting financial figures with proper separators and currency symbols.
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Public tool metadata for what this MCP can expose to an agent.
22 tools
addAdds two numbers together2 params
Adds two numbers together
Parameters* required
firstNumbernumberThe first addend
secondNumbernumberThe second addend
subtractSubtracts the second number from the first number2 params
Subtracts the second number from the first number
Parameters* required
minuendnumberThe number to subtract from (minuend)
subtrahendnumberThe number being subtracted (subtrahend)
multiplyMultiplies two numbers together2 params
Multiplies two numbers together
Parameters* required
SecondNumbernumberThe second number
firstNumbernumberThe first number
divisionDivides the first number by the second number2 params
Divides the first number by the second number
Parameters* required
denominatornumberThe number to divide by (denominator)
numeratornumberThe number being divided (numerator)
sumAdds any number of numbers together1 params
Adds any number of numbers together
Parameters* required
numbersarrayArray of numbers to sum
moduloDivides two numbers and returns the remainder2 params
Divides two numbers and returns the remainder
Parameters* required
denominatornumberThe number to divide by (denominator)
numeratornumberThe number being divided (numerator)
meanCalculates the arithmetic mean of a list of numbers1 params
Calculates the arithmetic mean of a list of numbers
Parameters* required
numbersarrayArray of numbers to find the mean of
medianCalculates the median of a list of numbers1 params
Calculates the median of a list of numbers
Parameters* required
numbersarrayArray of numbers to find the median of
modeFinds the most common number in a list of numbers1 params
Finds the most common number in a list of numbers
Parameters* required
numbersarrayArray of numbers to find the mode of
minFinds the minimum value from a list of numbers1 params
Finds the minimum value from a list of numbers
Parameters* required
numbersarrayArray of numbers to find the minimum of
maxFinds the maximum value from a list of numbers1 params
Finds the maximum value from a list of numbers
Parameters* required
numbersarrayArray of numbers to find the maximum of
floorRounds a number down to the nearest integer1 params
Rounds a number down to the nearest integer
Parameters* required
numbernumberThe number to round down
ceilingRounds a number up to the nearest integer1 params
Rounds a number up to the nearest integer
Parameters* required
numbernumberThe number to round up
roundRounds a number to the nearest integer1 params
Rounds a number to the nearest integer
Parameters* required
numbernumberThe number to round
sinCalculates the sine of a number in radians1 params
Calculates the sine of a number in radians
Parameters* required
numbernumberThe number in radians to find the sine of
arcsinCalculates the arcsine of a number in radians1 params
Calculates the arcsine of a number in radians
Parameters* required
numbernumberThe number to find the arcsine of
cosCalculates the cosine of a number in radians1 params
Calculates the cosine of a number in radians
Parameters* required
numbernumberThe number in radians to find the cosine of
arccosCalculates the arccosine of a number in radians1 params
Calculates the arccosine of a number in radians
Parameters* required
numbernumberThe number to find the arccosine of
tanCalculates the tangent of a number in radians1 params
Calculates the tangent of a number in radians
Parameters* required
numbernumberThe number in radians to find the tangent of
arctanCalculates the arctangent of a number in radians1 params
Calculates the arctangent of a number in radians
Parameters* required
numbernumberThe number to find the arctangent of
radiansToDegreesConverts a radian value to its equivalent in degrees1 params
Converts a radian value to its equivalent in degrees
Parameters* required
numbernumberThe number in radians to convert to degrees
degreesToRadiansConverts a degree value to its equivalent in radians1 params
Converts a degree value to its equivalent in radians
Parameters* required
numbernumberThe number in degrees to convert to radians
mcp-math-tools
Math and calculation tools for AI agents, exposed via the Model Context Protocol (MCP).
Tools
calculate
Evaluate math expressions safely (no eval). Supports arithmetic operators (+, -, *, /, ^, %), parentheses, functions (sqrt, abs, floor, ceil, round, log, ln, sin, cos, tan, min, max, pow), constants (pi, e), and named variables.
convert_units
Convert between units across six categories:
- Length: m, km, cm, mm, mi, yd, ft, in
- Weight: kg, g, mg, lb, oz, ton
- Temperature: C, F, K
- Data: B, KB, MB, GB, TB
- Time: s, min, h, d, week
- Speed: m/s, km/h, mph, knots
statistics
Statistical analysis on datasets: mean, median, mode, variance, standard deviation, min, max, range, percentile, correlation between two arrays, and a full summary mode.
format_number
Format numbers as: currency ($1,234.56), percentage, scientific notation, binary, octal, hexadecimal, significant figures, or with thousands separators.
percentage_calc
Common percentage operations: X% of Y, what percent X is of Y, percentage change between two values, tip calculator, discount calculator, and markup calculator.
Installation
npm install
npm run build
Usage with Claude Desktop
Add to your claude_desktop_config.json:
{
"mcpServers": {
"math-tools": {
"command": "node",
"args": ["path/to/mcp-math-tools/dist/index.js"]
}
}
}
Examples
Calculate: 2 * (3 + 4) ^ 2 returns 98
Convert: 100 from km/h to mph returns 62.137...
Statistics: summary of [1, 2, 3, 4, 5] returns mean, median, mode, variance, etc.
Format: 1234567.89 as currency returns $1,234,567.89
Percentage: 15% tip on 85.50 bill split 3 ways
License
MIT
Featured
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →