Convert measurements instantly
across every unit type.
Length, weight, volume, temperature, area, and speed conversions — with precise results, conversion formulas, and unit discovery endpoints in a single API.
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Reliable conversions with transparent formulas.
Convert between length, weight, volume, temperature, area, and speed units with consistent results. Every response includes the converted value and a human-readable formula so you can verify exactly how the calculation was performed.
{
"from": "miles",
"to": "km",
"input": 10,
"result": 16.09344,
"formula": "10 × 1.609344"
}
Simple API requests, instant results.
Pass a source unit, target unit, and numeric value in a simple JSON payload. No configuration, no external dependencies, and no lookup tables required. The API returns the converted value and the conversion formula in a single response.
POST /v1/technology/convert
Host: requiems.xyz
requiems-api-key: YOUR_API_KEY
Content-Type: application/json
{"from": "miles", "to": "km", "value": 10}
Real problems, real conversions.
Unit Conversion fits anywhere measurements need to be translated accurately and instantly.
Scientific and engineering calculations
Convert measurements between compatible units with consistent precision for technical, laboratory, and engineering workflows.
Travel and distance planning
Convert miles to kilometers, kilometers to miles, and other distance units for navigation, logistics, and international travel.
Recipe scaling and cooking
Switch between metric and imperial measurements when adapting recipes for different regions or serving sizes.
Fitness and health tracking
Convert weight, distance, and speed units across fitness apps, workout plans, and health dashboards.
Educational applications
Help students learn measurement systems and unit conversions with clear formulas and accurate results.
Build dynamic unit selectors
Use the available units endpoint to populate dropdowns and conversion tools in web and mobile applications.
Use together with complementary APIs.
Unit Conversion becomes even more useful when combined with other Requiems APIs.
Benefit: Convert physical measurements and currencies in the same workflow. Ideal for international commerce, shipping calculators, and pricing tools.
Outcome: One pipeline for quantity and money — shipping weight and landed cost in the same request flow.
Benefit: Transform distances and locations together. Convert miles to kilometers while calculating routes, delivery ranges, or travel estimates.
Outcome: Distance-aware location tools without hardcoding unit math.
Benefit: Handle both measurement and numeric transformations in engineering, educational, and technical applications.
Outcome: Measurement and radix conversion from a single API provider.
Frequently asked questions
Stop hardcoding conversion formulas.
One API key. Convert units instantly across length, weight, volume, temperature, area, and speed — plus 50+ APIs for developers.