Unit Converter
Convert length, weight, temperature and volume between metric and imperial units. Everything runs locally in your browser.
New to this? Read the Unit Converter guide →
How to use the unit converter
- Pick the category (length, mass, temperature, volume and so on).
- Choose the unit you have and the unit you want.
- Type a value and read the converted result instantly.
Conversions run in your browser, so they are fast and work offline once the page has loaded.
How conversion works
Most units convert by a fixed ratio to a base unit: there are exactly 2.54 centimetres in an inch and 1000 grams in a kilogram, so the tool scales through the base unit to reach your target. Temperature is the exception, because Celsius, Fahrenheit and Kelvin have different zero points, so they convert with a formula rather than a single multiplier. The tool handles both correctly.
Everyday conversions
- Recipes: cups to millilitres, ounces to grams, Fahrenheit to Celsius.
- Travel: miles to kilometres, pounds to kilograms.
- DIY and work: feet to metres, inches to centimetres.
Popular single conversions are linked under "Popular conversions" above, each on its own focused page.
Where you'd use this
Recipes, travel, shipping, gym equipment and any document written for the other measurement system.
For example: A US recipe calls for a 9×13 inch pan at 350°F. That is 23×33cm at 175°C — and knowing the tin is the standard European roasting size saves buying a new one.
Popular conversions
- Kilometers to Miles
- Miles to Kilometers
- Centimeters to Inches
- Inches to Centimeters
- Meters to Feet
- Feet to Meters
- Millimeters to Inches
- Meters to Yards
- Kilograms to Pounds
- Pounds to Kilograms
- Grams to Ounces
- Ounces to Grams
- Stone to Kilograms
- Kilograms to Stone
- Cups to Milliliters
- Milliliters to Cups
- Liters to Gallons
- Gallons to Liters
- Tablespoons to Milliliters
- Fluid ounces to Milliliters
- Pints to Liters
- Feet to Centimeters
- Centimeters to Feet
- Inches to Millimeters
- Yards to Meters
- Inches to Feet
- Feet to Inches
- Grams to Pounds
- Pounds to Grams
- Milligrams to Grams
- Teaspoons to Milliliters
- Milliliters to Tablespoons
- Milliliters to Fluid ounces
- Liters to Pints
- Cups to Fluid ounces
- Celsius to Fahrenheit
- Fahrenheit to Celsius
- Celsius to Kelvin
- Kelvin to Celsius
Frequently asked questions
What units can I convert?
Length, weight and mass, volume and temperature among others — for example kilometres to miles, kilograms to pounds, or Celsius to Fahrenheit.
How accurate are the conversions?
They use standard internationally-defined conversion factors, so results are accurate for everyday and most technical uses.
Is anything uploaded?
No. All conversions are computed in your browser.