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Unit Converter

Unit Converter handles the most common measurement categories: length, weight, temperature, area, volume, and speed. Select a source and target unit from clean dropdowns, enter a value, and get an instant result. A swap button reverses the conversion direction.

Unit Converter Runs locally
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Step by step

How to use it

  1. Select a category: length, weight, temperature, area, volume, or speed.

  2. Choose the source unit and enter a value.

  3. Choose the target unit to see the converted result instantly.

  4. Use the swap button to reverse the conversion direction.

When to use it

Use cases

  • Convert recipe measurements between metric and imperial units.

  • Check a shipping weight in kilograms when given in pounds.

  • Convert a temperature reading between Celsius and Fahrenheit.

  • Calculate room area in square meters from square feet.

  • Convert speed limits or running pace between km/h and mph.

Limits & privacy

What this tool does and does not do

Private by design

All conversions happen locally in your browser. No data is sent to a server.

  • Covers six common categories — specialized units (e.g. nautical, energy) aren't included.

  • Conversions are within a category only; cross-category conversion isn't supported.

  • Results are rounded to 10 significant figures, sufficient for everyday and most professional use.

Questions

Frequently asked questions

Does it support metric and imperial units?

Yes. Each category includes both metric (SI) and imperial units where applicable, so you can convert freely between systems.

How precise are the results?

Results are computed to 10 significant figures and trimmed of trailing zeros — far more precision than most practical uses require.

What unit categories are supported?

Length, weight, temperature, area, volume, and speed — covering the most common everyday and professional conversion needs.

How does temperature conversion work differently from the others?

Unlike length or weight, which use simple multiplication, temperature scales (Celsius, Fahrenheit, Kelvin) require offset-based formulas since their zero points differ.

What does the swap button do?

It swaps the source and target units (and reverses the conversion direction) so you can quickly check the conversion both ways without re-selecting units.

Can I convert between units in different categories, like length to weight?

No — conversions are only meaningful within the same category (e.g. length to length). Cross-category conversion isn't supported because the units aren't comparable.

Are the unit definitions based on official standards?

Yes — conversion factors use standard SI definitions and commonly accepted imperial equivalents (e.g. 1 inch = 2.54 cm exactly).