Unit Converter

Convert common measurements between metric, imperial and digital units with browser-native formulas.

Everything runs locally in your browser.

Everyday measurements

Convert distances, recipe measurements, room sizes, travel speeds and temperatures without opening a spreadsheet.

Metric and imperial

Switch between common SI, US customary and imperial units including meters, feet, miles, pounds, ounces, liters and gallons.

Private local processing

The formulas run in the page with JavaScript only. There is no upload endpoint, API dependency or server-side conversion job.

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Frequently Asked Questions

Is this unit converter free?

Yes. The Convertr unit converter is free to use and does not require an account.

Are values uploaded to the server?

No. Unit conversion uses first-party JavaScript formulas in your browser. The values you type are not uploaded.

Which categories are supported?

The converter supports length, weight and mass, temperature, area, volume, speed, digital data and time units.

Can I convert metric and imperial units?

Yes. Common metric and imperial units are included, such as meters, feet, miles, kilograms, pounds, liters, gallons, square meters and acres.

Unit Converter

Convert values among the supported measurement categories and units.

Input
A numeric value, source unit, target unit, and category.
Output
The converted numeric value with the applied unit relationship.
Real limitations
Results depend on defined factors, do not include live currency, and should not replace domain-specific precision, calibration, or safety calculations.
Privacy and data handling
a numeric value, source unit, target unit, and category is processed in this browser tab. Convertr does not receive or store it; closing or reloading the page clears the working state unless the tool explicitly offers a local download.

How to use this tool

  1. Provide a numeric value, source unit, target unit, and category in the tool controls.
  2. Choose the settings that affect the converted numeric value with the applied unit relationship, then run the tool.
  3. Review the converted numeric value with the applied unit relationship before copying or downloading it.

Common failure modes

A non-numeric value, incompatible categories, unsupported unit, or value outside browser number precision produces no reliable result.

Useful example

Convert 5 kilometres to miles and review the displayed precision before copying it.