Free Unit Converter

Convert 492 units across 17 categories: everyday metric and imperial units, plus ancient and regional units from around the world.

Most-used conversions

• Feet to meters
• Meters to feet
• Inches to centimeters
• Centimeters to inches
• Miles to kilometers
• Kilometers to miles
• Pounds to kilograms
• Kilograms to pounds
• Ounces to grams
• Fahrenheit to Celsius
• Celsius to Fahrenheit
• US gallons to liters
• US cups to milliliters
• US fluid ounces to milliliters
• Miles per hour to kilometers per hour
• Square feet to square meters
• Acres to hectares
• Hours to minutes
• Gigabytes to megabytes
• Mbps to MB/s
• MPG (US) to L/100 km
• Kilocalories to kilojoules
• Horsepower to kilowatts
• PSI to bars

Unit categories

• Length
  85 units
• Weight & Mass
  52 units
• Volume
  77 units
• Area
  40 units
• Temperature
  8 units
• Time
  40 units
• Speed
  16 units
• Energy
  25 units
• Power
  15 units
• Pressure
  19 units
• Force
  15 units
• Digital Storage
  24 units
• Data Transfer Rate
  15 units
• Angle
  18 units
• Frequency
  10 units
• Fuel Economy
  8 units
• Counting & Quantity
  25 units

Popular conversions

• Feet to meters
• Meters to feet
• Kilograms to pounds
• Pounds to kilograms
• US gallons to liters
• Liters to US gallons
• Square feet to square meters
• Square meters to square feet
• Celsius to Fahrenheit
• Fahrenheit to Celsius
• Days to hours
• Hours to minutes
• Miles per hour to kilometers per hour
• Kilometers per hour to miles per hour
• Kilocalories to kilojoules
• Kilojoules to kilocalories
• Horsepower to kilowatts
• Kilowatts to horsepower
• PSI to bars
• Bars to PSI
• Newtons to pounds-force
• Pounds-force to newtons
• Megabytes to gigabytes
• Gigabytes to megabytes
• Mbps to MB/s
• MB/s to Mbps
• Degrees to radians
• Radians to degrees
• Hertz to revolutions per minute
• Revolutions per minute to hertz
• MPG (US) to L/100 km
• L/100 km to MPG (US)
• Lakhs to millions
• Millions to lakhs

Historical and world units

Beyond the everyday metric, US and imperial units, this site covers units from around the world and across history, from the cubit and Roman mile to the tsubo, tola and lakh. Browse all historical and traditional units.