Unit Converter
Convert length, weight, volume, area, speed, time, and temperature in one place. Pick a type, enter a number, and read the answer both ways. Imperial factors are exact, and everything runs in your browser.
1 cm = 0.3937008 in
1 cm in every length unit
| Unit | Symbol | Value |
|---|---|---|
| Millimeters | mm | 10 |
| Centimeters | cm | 1 |
| Meters | m | 0.01 |
| Kilometers | km | 0.00001 |
| Inches | in | 0.3937008 |
| Feet | ft | 0.0328084 |
| Yards | yd | 0.01093613 |
| Miles | mi | 0.000006213712 |
Common conversions
| From | Equals |
|---|---|
| 1 cm | 0.3937008 in |
| 1 mi | 1.609344 km |
| 1 kg | 2.204623 lb |
| 1 oz | 28.34952 g |
| 1 gal | 3.785412 L |
| 1 cup | 236.5882 mL |
| 1 ac | 4046.856 m² |
| 60 mph | 96.56064 km/h |
| 98.6 °F | 37 °C |
| 100 °C | 212 °F |
How to use it
1. Pick a measurement type
Choose length, weight, volume, area, speed, time, or temperature.
2. Enter a value and units
Type a number, then choose the From unit and the To unit. The swap button reverses them.
3. Read the result
The answer updates as you type. A table below shows the same amount in every unit of that type.
4. Copy it
Copy the converted number with one click.
Common questions
Are the conversion factors exact?
For length, weight, volume, and area, yes. The inch is defined as exactly 2.54 cm, the pound as exactly 0.45359237 kg, and the US gallon as exactly 3.785411784 L. Every other imperial unit here is built from those, so results come straight from the definitions. Only the displayed number is rounded, to 7 significant digits.
How do I convert Fahrenheit to Celsius?
Subtract 32, then multiply by 5/9. Water freezes at 32 °F (0 °C) and boils at 212 °F (100 °C). Temperature is an offset scale, not a simple ratio, so the converter goes through kelvin instead of using one multiplier.
Are the gallon, cup, and ounce the US or the UK size?
The US size. A US gallon is 3.785 L and a US cup is about 236.6 mL. The UK imperial gallon is larger, at 4.546 L, and is not included here. The fluid ounce here is a volume, not a weight, so it will not match the ounce in the weight tab.
Which measurement types are supported?
Length, weight and mass, volume, area, speed, time, and temperature. Each type has the common metric and US customary units, for example miles, feet, pounds, stone, acres, knots, and kelvin.
Does anything get sent to a server?
No. The math runs in your browser, so nothing you type is uploaded.