Unit Converter
Convert length, weight, temperature, area, volume, speed, time and data sizes between metric and imperial units.
- 8 kinds of units
- Metric and imperial
- Converts as you type
Result
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In every unit
What this tool does
Unit Converter changes a value from one unit to another and shows the result in every other unit of the same kind at once, so you can compare at a glance.
It covers length, weight, temperature, area, volume, speed, time and digital storage. Conversion factors use the exact international definitions, for example 1 inch = 2.54 cm and 1 pound = 0.45359237 kg.
Who it helps
- Cooks and bakers converting cups, millilitres, ounces and grams.
- Travellers switching between miles and kilometres or °C and °F.
- Students checking science and maths homework.
- Builders and DIYers converting feet, metres and square footage.
How to use it
- Choose what you are measuring, such as Length or Temperature.
- Type the value and pick the units to convert from and to.
- Read the result, or see the value in every unit in the table.
Common conversions
| Conversion | How to convert | Example |
|---|---|---|
| Centimetres to inches | Divide by 2.54 | 10 cm ≈ 3.94 in |
| Inches to centimetres | Multiply by 2.54 | 12 in = 30.48 cm |
| Kilograms to pounds | Multiply by about 2.2046 | 5 kg ≈ 11.02 lb |
| Pounds to kilograms | Multiply by 0.45359237 | 10 lb ≈ 4.54 kg |
| Celsius to Fahrenheit | Multiply by 9, divide by 5, then add 32 | 37 °C = 98.6 °F |
| Fahrenheit to Celsius | Subtract 32, multiply by 5, then divide by 9 | 212 °F = 100 °C |
1 inch = 2.54 cm and 1 pound = 0.45359237 kg are exact international definitions. Results marked ≈ are rounded to two decimal places.
Good to know
| Item | Details |
|---|---|
| US and UK units | Cups, fluid ounces and teaspoons use US sizes; both US and UK gallons are listed |
| Digital storage | KB, MB and GB use 1,000; KiB, MiB and GiB use 1,024 |
| Year | A year is counted as 365 days |
| Precision | Results show up to 6 significant digits |
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply by 9, divide by 5, then add 32. So 25 °C × 9 ÷ 5 + 32 = 77 °F.
How many centimetres are in an inch?
Exactly 2.54 cm. A foot is 30.48 cm.
Why is my 1 TB drive shown as 931 GB on my computer?
Drive makers use 1 TB = 1,000,000,000,000 bytes, while many computers count in units of 1,024. 1 TB is about 931 GiB.
Is a UK gallon the same as a US gallon?
No. A UK gallon is about 4.546 litres and a US gallon is about 3.785 litres.