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Help & Documentation

Learn how to use Unitconvr's tools, API, and widgets

How to Use the Converter

1

Select Category

Choose from Length, Weight, Temperature, Area, Volume, Speed

2

Enter Value

Type the number you want to convert in the input field

3

Choose Units

Select source and target units from the dropdowns

4

Get Results

Results appear instantly, rounded to 12 significant digits for display.

API Documentation

Our free API allows you to integrate unit conversions into your applications.

Single Conversion

GET /api/v1/convert

Convert a single value between units

Batch Conversion

POST /api/v1/batch

Convert multiple values in one request

List Units

GET /api/v1/units/[category]

Get all available units for a category

View Full API Docs

Embed Widgets

Add unit converters to your website with our customizable widgets.

  1. 1Visit the Widget Builder tool
  2. 2Select category and customize appearance
  3. 3Copy the generated code
  4. 4Paste into your website's HTML
Build a Widget

Frequently Asked Questions

How accurate are the conversions?

The calculator uses stored unit definitions and rounds displayed results to 12 significant digits. Display precision does not guarantee measurement accuracy. Check the unit definition and formula for your task.

Is the service free?

Yes, Unitconvr is completely free to use, including the API and widgets.

Can I use this offline?

An internet connection is required to load pages and API data. Offline page caching is not supported.

Are there API rate limits?

The origin API at unitconvr.com/api allows 10–100 requests per minute, depending on the endpoint. Check /api/v1 and the response rate-limit headers. The edge API is a separate service.

Need more help?Contact Support