Unit Converter
Six categories, all the everyday units, converted as you type.
Result
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Conversions people look up most
| From | To | Multiply by |
|---|---|---|
| Miles | Kilometres | 1.609 |
| Feet | Metres | 0.3048 |
| Pounds | Kilograms | 0.4536 |
| US gallons | Litres | 3.785 |
| Inches | Centimetres | 2.54 |
Temperature is the odd one out — it needs an offset, not just a factor: °F = °C × 9/5 + 32. Quick mental version: double the Celsius and add 30 (accurate within a couple of degrees for everyday weather).
Watch out for the two gallons (and pints, and fluid ounces)
A US gallon is 3.785 L; a UK (imperial) gallon is 4.546 L — 20% bigger. The same split affects pints and fluid ounces, which is why a "pint" in a London pub is larger than one in New York. This converter includes both variants; recipe conversions especially deserve the right one.
Frequently asked questions
How precise are the conversions?
Factors are exact where defined by standard (inch = 2.54 cm exactly, pound = 0.45359237 kg exactly) and shown to 6 significant digits otherwise — more than enough for schoolwork, cooking, and engineering estimates.
Why does 1 tonne differ from 1 US ton?
A metric tonne is 1,000 kg; a US ("short") ton is 2,000 lb ≈ 907 kg; an imperial ("long") ton is 2,240 lb ≈ 1,016 kg. This tool uses the metric tonne and short ton, labelled.
Does this work offline?
Once the page has loaded, yes — all conversion math is local JavaScript with no server round-trips.