Unit Converter API — Convert Between Any Measurement Units
Convert between units of length, mass, volume, temperature, speed, area, pressure, time, energy, and data storage. Free API.
What is Unit Conversion?
Unit conversion transforms values from one measurement unit to another across multiple categories. The API supports length (meters, feet, miles, km, etc.), mass/weight (kg, lbs, ounces, etc.), volume (liters, gallons, cups, etc.), temperature (Celsius, Fahrenheit, Kelvin), speed (km/h, mph, knots), area (m², acres, hectares, etc.), pressure (Pa, psi, bar, etc.), time (seconds, hours, days, etc.), energy (J, cal, kWh, etc.), and data storage (bytes, KB, MB, GB, TB).
How to Use It
Call GET /api/v1/unit-converter?value=100&from=km&to=miles. Returns { value: number, from: string, to: string, result: number, category: string }.
Try it live
Test this endpoint in the interactive console
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Frequently Asked Questions
How many units are supported?
Over 150 units across 10 categories.