Only Trusted Unit Converter
v1A value in, converted out.
Free · No uploads · On-deviceNothing converted yet. Everything stays on this page.
How it works
Through a base unit, except temperature
Length converts through metres, weight through kilograms, and volume through litres. A value is changed into the base unit, then out of it into the target unit, using fixed factors: a mile is 1609.344 metres, a pound is 0.45359237 kilograms, a US gallon is 3.78541 litres.
Temperature is different, because its scales start at different points, not just different sizes. It converts through Celsius: Fahrenheit to Celsius subtracts 32 then multiplies by 5/9, Kelvin to Celsius subtracts 273.15, and the reverse steps run the other way.
Guide
Conversions people actually need
- Cooking: cups to millilitres, or a recipe written in ounces into grams. US cups are used here; a metric cup is 250 ml, not 236.6 ml.
- Travel: miles to kilometres for road distances, feet to metres for heights.
- Weather: Fahrenheit to Celsius when a forecast comes from another country.
- Precision: results show six decimals at most. Tiny or huge results switch to exponent form so they stay readable.
Questions
Are US gallons different from UK gallons?
Yes. This tool uses US gallons (3.78541 litres). A UK gallon is 4.54609 litres, so a conversion done with the wrong gallon is off by about 20%.
Is temperature conversion exact?
The formulas are exact. Only the display is rounded, to six decimals, and very large or very small results switch to exponent form.
Can it convert currency?
No. Exchange rates change daily and need a live source. This tool converts physical units only, whose factors never change.
Do my numbers leave this page?
No. The conversion runs in your browser, on your device. Nothing is uploaded, saved or sent anywhere.