How to use the unit converter
- Choose a category.
- Enter an amount and select source and target units.
- Read the instant result or swap the units.
Metric vs imperial units
Metric uses decimal units such as meters and kilograms. Imperial and US customary measurements include feet and pounds.
Imperial vs US customary units
US and Imperial fluid ounces, pints, and gallons are explicitly separate because their volumes differ.
Common length conversions
One inch is 2.54 centimeters; one meter is about 3.28 feet; one mile is 1.609344 kilometers.
Common weight conversions
One pound is 0.45359237 kilograms; one kilogram is about 2.20462 pounds.
Temperature conversion
Temperature uses offset formulas: °F = °C × 9/5 + 32, and K = °C + 273.15.
Volume conversion
A US gallon is 3.785411784 liters; an Imperial gallon is 4.54609 liters.
Frequently asked questions
How many centimeters are in an inch?
One inch is exactly 2.54 centimeters.
How many feet are in a meter?
One meter is approximately 3.28084 feet.
How many pounds are in a kilogram?
One kilogram is approximately 2.20462 pounds.
How do I convert Celsius to Fahrenheit?
Multiply Celsius by 9/5, then add 32.
Is a US gallon the same as an Imperial gallon?
No. They have different volumes.
Is a US pint the same as a UK pint?
No. An Imperial pint is larger.
What is the difference between metric and imperial units?
Metric units scale by powers of ten; imperial units do not.