OOnDevice

Unit Converter

Convert between units of length, weight, temperature, volume, speed, and more.

Works offlineNothing uploaded
3.28084

How to use it

1

Select conversion type

Choose the category like length, weight, or temperature.

2

Enter a value

Type the number you want to convert.

3

View converted result

See the converted value in your target unit instantly.

When to use Unit Converter

A German recipe calls for 250g of flour and your kitchen scale only does ounces. A Canadian road sign says 80 km/h and you want to know how that feels. Pick a category — length, weight, temperature, volume, or speed — enter a value, and every unit in that category updates at once. No hunting for the right output field: the full list refreshes live, so you can see 250g is 8.8 oz and 0.55 lb at the same glance. Covers millimeters to miles, milligrams to short tons, Celsius to Fahrenheit to Kelvin, milliliters to US gallons, and meters-per-second to miles-per-hour. Conversion factors are baked into the page — no server call, no network needed after the page loads.

  • Convert 250g of flour to ounces from a German recipe
  • Check what 38°C feels like in Fahrenheit for a weather app
  • Convert km/h to mph while reading a Canadian road atlas

About this tool

Metric and imperial coexist in daily life — a recipe in grams, a road sign in miles, a weather app stuck on Fahrenheit. Pick a category (length, weight, temperature, volume, or speed), enter a value, and see it converted to every unit in that category at once. No hunting for the right field: the full list updates live. Covers millimeters to miles, milligrams to tons, Celsius to Fahrenheit to Kelvin, milliliters to gallons, and meters-per-second to miles-per-hour. Conversions run locally — your inputs never leave this page.

Frequently asked

Is this converter private? Does it work offline?
Yes. All conversions happen on your computer — your inputs never leave your device.
What units are supported?
Length (mm to miles), weight (mg to tons), temperature (C/F/K), volume (mL to gallons), and speed (m/s to mph).
How accurate are the conversions?
Conversions use standard factors and are accurate to several decimal places.
Can I convert between metric and imperial?
Yes — all categories include both metric and imperial units.