Unit Converter
Type a number and get the answer instantly, with a chart of common values.
–
Calculations run in this page only. Conversion factors follow official definitions such as NIST.
Popular conversions
- Centimeters to Inches
- Inches to Centimeters
- Kilograms to Pounds
- Pounds to Kilograms
- Millimeters to Inches
- Celsius to Fahrenheit
- Feet to Meters
- Feet to Centimeters
- Meters to Feet
- Fahrenheit to Celsius
- Kilometers to Miles
- Miles to Kilometers
- Fluid ounces (US) to Milliliters
- Milliliters to Fluid ounces (US)
- Hectares to Acres
- Pounds per square inch to Bar
- Stone to Kilograms
- Centimeters to Feet
- Kilopascals to Pounds per square inch
- Kilojoules to Kilocalories
How to use
- 1. Pick a categoryLength, weight, temperature, area and more.
- 2. Choose units and typeType in the top box and the answer appears below. Typing in the bottom box converts the other way.
- 3. Use the chartA chart of common values appears on the right. The row matching your number is highlighted.
Handy reference
| Conversion | Value |
|---|---|
| 1 inch | 2.54 cm |
| 1 foot | 30.48 cm |
| 1 mile | about 1.609 km |
| 1 pound | about 0.4536 kg |
| 1 ounce | about 28.35 g |
| 1 US gallon | about 3.785 L |
Sources
Conversion factors follow official definitions such as the NIST conversion tables.
Sources: NIST Guide to the SI, Appendix B
FAQ
Who is this unit converter for?
It suits online shoppers checking sizes in inches or centimeters, home cooks using recipes from other countries, travelers converting km/h, mph and °C, DIYers who work in fractions of an inch, and students or engineers converting pressure, power or data sizes.
When is it useful?
For example, turning a TV or clothing size from inches into centimeters, converting a weight between kilograms and pounds, changing a recipe’s 180°C into Fahrenheit, or comparing a room size in square meters and square feet. The answer appears as you type, with a chart of common values.
What are the benefits of using it?
You can convert length, weight, temperature, volume, area, speed, fuel economy, pressure, energy, power and data on one page. Type in either box and it converts the other way. The chart can be printed, and your last category and units stay on this device.
How many centimeters are in an inch?
Exactly 2.54 cm (international definition).
How many kilograms is a pound?
Exactly 0.45359237 kg — about 0.45 kg.
How do I convert Fahrenheit to Celsius?
°C = (°F − 32) × 5 ÷ 9. A body temperature of 98.6°F is 37°C. The other way, °F = °C × 9 ÷ 5 + 32.
How many square feet are in a square meter?
1 square meter is about 10.764 square feet, because 1 square foot is exactly 0.09290304 m². Square inches, yards, acres and square miles are also available.
Are US and UK gallons the same?
No. A US gallon is about 3.785 liters and a UK (imperial) gallon is about 4.546 liters. The unit names say (US) or (UK).
What is the difference between MB and MiB?
An MB (megabyte) is 1,000 × 1,000 bytes; an MiB (mebibyte) is 1,024 × 1,024 bytes. Some computers show MiB values labeled as MB.
How are results in feet or pounds shown?
When the result is in feet, it is also shown as feet plus inches, for example 5 ft 7 in. When the result is in pounds, it is also shown as pounds plus ounces, with the value in stone.
Can I use fractions of an inch?
Yes. When the result is in inches, a fraction to the nearest 1/16 inch is shown too. You can also type fractions such as 5 1/4 or 3/8 in the number box.
Can it convert cooking measures?
Yes. US cups (about 236.6 mL), tablespoons (about 14.8 mL), teaspoons (about 4.93 mL) and fluid ounces are included, as well as UK fluid ounces. It cannot turn a volume into a weight, such as a cup of flour into grams.
What does “Significant digits” do?
It sets how many digits the answer shows: 4, 6 or 10 (6 by default). Trailing zeros are dropped from ordinary numbers. Very large numbers (10^15 or more) and very small ones (under 0.000001) are shown in scientific notation, such as 1.23457e+15.
What does “Pick by country” do?
Pick two countries, such as USA → Metric countries, and every category switches to the units each country commonly uses. For example, length becomes inches to centimeters and weight becomes pounds to kilograms. It is optional.
How is fuel economy converted?
It converts kilometers per liter (km/L), liters per 100 km (L/100km) and miles per gallon (US and UK). L/100km = 100 ÷ km/L. A value of 0 cannot be converted.
Which calorie and horsepower definitions are used?
One kilocalorie is 4,184 joules. Horsepower is split into mechanical horsepower (about 745.7 watts) and metric horsepower (about 735.5 watts).
Is my data sent anywhere?
No. The conversion happens in your browser. Your last category, units, value, significant digits and country choice are saved only in this device’s browser for next time.
Is there anything it can’t convert?
Currency, time and angles are not included. It also cannot convert between categories, such as volume to weight.
Does it work on a phone?
Yes. On a narrow screen the answer and chart appear below the inputs. Unit menus show the symbol first so names don’t get cut off.
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