Unit Converter
Convert length, weight, volume, area, speed and temperature between metric and imperial units. Choose a type, enter a value and read the result instantly. Nothing is stored or sent.
Convert units
How to convert units
- Choose the type of unit, such as Length or Temperature.
- Enter the value and pick the unit you are converting from and to.
- Read the result and the conversion rate underneath. Use Swap units to reverse the conversion.
Common conversions
| Type | Conversion |
|---|---|
| Length | 1 inch = 2.54 cm; 1 foot = 0.3048 m; 1 mile = 1.609344 km |
| Weight | 1 kg ≈ 2.2046 lb; 1 lb = 0.45359237 kg; 1 oz ≈ 28.35 g |
| Volume | 1 US gallon ≈ 3.7854 litres; 1 US cup ≈ 236.6 ml |
| Area | 1 acre ≈ 4,046.86 m²; 1 hectare = 10,000 m² |
Celsius, Fahrenheit and Kelvin
Temperature uses formulas rather than a simple multiplier. Fahrenheit = Celsius × 9/5 + 32, Celsius = (Fahrenheit − 32) × 5/9, and Kelvin = Celsius + 273.15. Examples: 100 °C is 212 °F, 0 °C is 32 °F, 37 °C is 98.6 °F, and −40 is the same in both scales.
US and UK units are not always the same
The volume units here are US liquid measures, so a gallon is about 3.785 litres. An imperial (UK) gallon is larger, about 4.546 litres. The ounce is the everyday avoirdupois ounce used for food and body weight, not the troy ounce used for gold and silver (see the gold calculator).
The feddan
The feddan is an Egyptian unit of land area, about 4,200.83 square metres, which is slightly larger than an acre. It is included in the Area list.
Frequently asked questions
How many kilometres are in a mile?
One mile is exactly 1.609344 kilometres. For a quick estimate, multiply miles by 1.6.
How do I convert kg to pounds?
Multiply kilograms by 2.20462. For example, 70 kg is about 154.3 lb.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. So 20 °C is 68 °F.
What is a feddan in square metres?
About 4,200.83 square metres. It is used for farmland in Egypt.
Is a US gallon the same as a UK gallon?
No. A US gallon is about 3.785 litres and a UK imperial gallon is about 4.546 litres.
More free tools
BMI calculatorPercentage calculatorCurrency converterAll online calculators