Euclid

AI models do not calculate.

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What it can do

  • Calculate: Deterministic calculator for mathematical expressions. Arithmetic, percentages, exponents, roots, trigonometry, logarithms, factorials, and any expression with a numerical answer.
  • Convert: Converts between units of measurement. Supports length, weight, volume, temperature, area, speed, time, data (bytes/bits), and 100+ other units.
  • Statistics: Descriptive and inferential statistics. Mean, median, mode, std dev, variance, percentile, z-test, t-test, chi-squared, confidence intervals, correlation, and normal distribution functions

What data it sees

Do you need an account

No: the server works without sign-in

AI models do not calculate. They predict the most probable next token. When the token is a number, it is often close, and sometimes wrong. The error compounds downstream.

Euclid is a deterministic computation service for AI agents. It provides 10 tools via a single MCP connection:

  • calculate: arithmetic, percentages, exponents, trig, logarithms
  • convert: unit conversions across 1,000+ unit pairs
  • statistics: mean, median, mode, variance, standard deviation, percentile
  • datetime: date differences, business days, age, timezone conversion
  • finance: loan payments, NPV, IRR, CAGR, compound interest
  • regex: pattern testing and extraction
  • color: hex/RGB/HSL conversion, contrast ratios, WCAG compliance
  • encode: base64, hex, URL, SHA-256, MD5, JWT decoding
  • validate: email, URL, phone, ISBN, credit card, UUID
  • geo: distance, bearing, bounding boxes, coordinate conversion

Free tier: 1,000 lifetime computations. No credit card required. Paid: $1.00 per 10,000 computations.

Same input. Same output. Guaranteed.

Server tool list (10)

Raw names from tools/list. Only developers need these.

calculateDeterministic calculator for mathematical expressions. Arithmetic, percentages, exponents, roots, trigonometry, logarithms, factorials, and any expression with a numerical answer.
convertConverts between units of measurement. Supports length, weight, volume, temperature, area, speed, time, data (bytes/bits), and 100+ other units.
statisticsDescriptive and inferential statistics. Mean, median, mode, std dev, variance, percentile, z-test, t-test, chi-squared, confidence intervals, correlation, and normal distribution functions.
datetimeCalendar and date arithmetic. Date differences, add/subtract time, age, business days, day of week, quarter, leap year, days in month.
encodeEncoding, decoding, hashing, and JWT inspection. Base64, hex, URL, HTML encoding/decoding. SHA-256/512, SHA-1, MD5 hashing. HMAC signatures. JWT decode.
financeFinancial calculations with arbitrary-precision decimal arithmetic. Loan payments, amortization, present/future value, NPV, IRR, CAGR, margin/markup, compound interest.
geoGeospatial calculations. Distance (Haversine/Vincenty), bearing, midpoint, destination point, bounding boxes, polygon area, point-in-polygon, coordinate conversions (DMS, UTM).
colorColor space conversions, WCAG accessibility checks, color manipulation, and palette generation. Supports hex, RGB, HSL, HSV, CMYK, Lab, OKLab, OKLCH.
regexSafe regex execution via RE2. Test, match, matchAll, replace, split, and escape operations. Linear-time guarantees, no ReDoS.
validateFormat validation for structured identifiers. Email (RFC 5322), URL (WHATWG), UUID (RFC 9562), credit card (Luhn), IPv4, IPv6, IBAN (mod-97).