Faktori API

Free JSON API for conversions and calculations. No API key required. CORS enabled.

Unit Conversion

GET /api/convert?from=cm&to=feet&value=171

Response:

{
  "from": { "unit": "cm", "value": 171 },
  "to": { "unit": "feet", "value": 5.610236 },
  "formula": "feet = cm × custom"
}

Available conversions: cm-feet, cm-inches, inches-cm, meters-feet, km-miles, miles-km, kg-lbs, lbs-kg, celsius-fahrenheit, fahrenheit-celsius, kelvin-celsius, liters-gallons, gallons-liters, ml-oz, sqft-sqm, sqm-sqft, mph-kmh, kmh-mph, and more.

Compound Interest

GET /api/finance/compound-interest?principal=10000&rate=7&years=10

Optional: compounds (default: 12 for monthly)

{
  "principal": 10000,
  "rate": 7,
  "years": 10,
  "compoundsPerYear": 12,
  "total": 20096.61,
  "interest": 10096.61,
  "formula": "A = P(1 + r/n)^(nt)",
  "ruleOf72": 10.29
}

Percentage

GET /api/math/percentage?percent=15&of=200

{
  "percent": 15,
  "of": 200,
  "result": 30,
  "formula": "result = (15 ÷ 100) × 200"
}

Rate Limits

100 requests per minute per IP
All responses include CORS headers
Responses cached for 24 hours
No API key required

About

All calculations use pure math formulas — no external data sources.
Results are deterministic: same input always produces same output.
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