Unit Converter
## Overview The Unit Converter API provides 11 endpoints covering 200+ units across 10 measurement categories. Simple, fast, and accurate conversions with formula explanations. ## Key Features - **10 Categories**: Length, weight/mass, temperature, volume, speed, time, digital storage, energy, pressure, area - **200+ Units**: Metric, imperial, and specialized units (nautical miles, troy ounces,…
2 subscribers
8.8/10 popularity
196 ms avg latency
99% success rate
11 endpoints
The in-depth APIMemo review for this API hasn't been published yet —
the data below comes straight from the public marketplace listing.
Unit Converter endpoints
| Method | Endpoint | Description |
|---|---|---|
| GET |
Single conversion /convert |
Convert a value from one unit to another. Supports all 26 categories including temperature (non-linear) and fuel economy (inverse). Units can be referenced by id, symbol, or… |
| POST |
Batch conversion /convert/batch |
Convert one value into multiple target units simultaneously. All targets must share the same category as the source unit. Returns a list of individual conversion results. |
| POST |
Chain conversion /convert/chain |
Perform a sequence of conversions where the output of each step is the input of the next. Each step may convert to any compatible unit. Useful for multi-hop unit transformations. |
| GET |
List all categories /categories |
Returns all supported unit categories with unit counts and metadata. |
| GET |
List units in a category /categories/{category} |
Returns detailed information about every unit in the specified category. |
| GET |
Search units /units/search |
Full-text search across unit id, name, symbol, and aliases. Optionally filter by category. |
| GET |
List compatible units /units/{unit_id}/compatible |
Returns all units that the given unit can be converted to/from (i.e., all units in the same category). |
| GET |
Temperature conversion /temperature/convert |
Convert between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur. Returns exact named formula used. Validates against absolute zero. |
| GET |
Fuel economy conversion /fuel/convert |
Convert between fuel economy units including L/100km (inverse unit). Supports mpg (US & UK), km/L, L/100km, mi/L, and gallons/100mi. Returns all equivalent values simultaneously. |
| GET |
API root / |
Returns API overview, version, and quick-start examples. |
| GET |
Health check /health |
Returns service health status. Suitable for uptime monitors and RapidAPI health probes. |
Unit Converter pricing
| Plan | Price | Rate limit | Quotas |
|---|---|---|---|
| BASIC | Free | — |
|
| Pro | $9.99 / month | 20 / minute |
|
| Ultra | $29.99 / month | 100 / minute |
|
