Which units are supported?

Length (mm to miles), weight (milligrams to metric tons), volume (milliliters to gallons), area (square millimeters to hectares and acres), and temperature (Celsius, Fahrenheit, Kelvin).

How accurate are the conversions?

Conversions use standard, precise conversion factors (e.g. 1 inch = 2.54 cm exactly) and display up to 8 decimal places, so results are accurate for everyday and most technical use.

Is my data sent anywhere?

No. All math runs locally in your browser with JavaScript — nothing is uploaded or logged.

Why is temperature handled differently from the other categories?

Temperature scales don't share a common zero point the way length or weight units do, so converting between them needs an offset, not just a multiplier. The tool handles that automatically.

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UNIT CONVERTER

Length, weight, volume, area, and temperature — convert between units instantly, calculated right here in your browser.

How to convert a unit

1
Pick a category: length, weight, volume, area, or temperature.
2
Choose the unit you're converting from and enter a value.
3
Choose the unit you're converting to — the result updates instantly.
4
Use the swap button to flip the two units in one click.

Questions

Which units are supported?: Length (mm to miles), weight (milligrams to metric tons), volume (milliliters to gallons), area (square millimeters to hectares and acres), and temperature (Celsius, Fahrenheit, Kelvin).
How accurate are the conversions?: Conversions use standard, precise conversion factors (e.g. 1 inch = 2.54 cm exactly) and display up to 8 decimal places, so results are accurate for everyday and most technical use.
Is my data sent anywhere?: No. All math runs locally in your browser with JavaScript — nothing is uploaded or logged.
Why is temperature handled differently from the other categories?: Temperature scales don't share a common zero point the way length or weight units do, so converting between them needs an offset, not just a multiplier. The tool handles that automatically.