Unit conversions
410 conversions across 14 quantities, each with an exact formula, a converter and a table of common values. Need something else? The Unit Converter handles every unit in one place.
Popular conversions
- CM to Inches
- Inches to CM
- KG to Pounds
- Pounds to KG
- Celsius to Fahrenheit
- Fahrenheit to Celsius
- KM to Miles
- Miles to KM
- Feet to Meters
- Meters to Feet
- CM to Feet
- ML to Cups
- Cups to ML
- Liters to Gallons
- Gallons to Liters
- Ounces to Grams
- Grams to Ounces
- KM/H to MPH
- MPH to KM/H
- Square Meters to Square Feet
- Square Feet to Square Meters
- L/100km to MPG
- MPG to L/100km
- kW to HP
All conversions
Length · 62
- MM to CM
- MM to Meters
- MM to KM
- MM to Inches
- MM to Feet
- MM to Yards
- MM to Miles
- CM to MM
- CM to Meters
- CM to KM
- CM to Inches
- CM to Feet
- CM to Yards
- CM to Miles
- Meters to MM
- Meters to CM
- Meters to KM
- Meters to Inches
- Meters to Feet
- Meters to Yards
- Meters to Miles
- KM to MM
- KM to CM
- KM to Meters
- KM to Inches
- KM to Feet
- KM to Yards
- KM to Miles
- Inches to MM
- Inches to CM
- Inches to Meters
- Inches to KM
- Inches to Feet
- Inches to Yards
- Inches to Miles
- Feet to MM
- Feet to CM
- Feet to Meters
- Feet to KM
- Feet to Inches
- Feet to Yards
- Feet to Miles
- Yards to MM
- Yards to CM
- Yards to Meters
- Yards to KM
- Yards to Inches
- Yards to Feet
- Yards to Miles
- Miles to MM
- Miles to CM
- Miles to Meters
- Miles to KM
- Miles to Inches
- Miles to Feet
- Miles to Yards
- Nautical Miles to KM
- KM to Nautical Miles
- Nautical Miles to Miles
- Miles to Nautical Miles
- Micrometers to MM
- MM to Micrometers
Weight · 48
- MG to Grams
- MG to KG
- MG to Ounces
- MG to Pounds
- Grams to MG
- Grams to KG
- Grams to Ounces
- Grams to Pounds
- Grams to Stone
- KG to MG
- KG to Grams
- KG to Ounces
- KG to Pounds
- KG to Stone
- Ounces to MG
- Ounces to Grams
- Ounces to KG
- Ounces to Pounds
- Ounces to Stone
- Pounds to MG
- Pounds to Grams
- Pounds to KG
- Pounds to Ounces
- Pounds to Stone
- Stone to Grams
- Stone to KG
- Stone to Ounces
- Stone to Pounds
- Tonnes to KG
- KG to Tonnes
- Tonnes to Pounds
- Pounds to Tonnes
- US Tons to Tonnes
- Tonnes to US Tons
- Long Tons to Tonnes
- Tonnes to Long Tons
- US Tons to KG
- KG to US Tons
- US Tons to Pounds
- Pounds to US Tons
- Troy Ounces to Grams
- Grams to Troy Ounces
- Troy Ounces to Ounces
- Ounces to Troy Ounces
- Carats to Grams
- Grams to Carats
- Carats to MG
- MG to Carats
Temperature · 6
Volume · 84
- ML to Liters
- ML to Fluid Ounces
- ML to Cups
- ML to Pints
- ML to Quarts
- ML to Gallons
- Liters to ML
- Liters to Fluid Ounces
- Liters to Cups
- Liters to Pints
- Liters to Quarts
- Liters to Gallons
- Fluid Ounces to ML
- Fluid Ounces to Liters
- Fluid Ounces to Cups
- Fluid Ounces to Pints
- Fluid Ounces to Quarts
- Fluid Ounces to Gallons
- Cups to ML
- Cups to Liters
- Cups to Fluid Ounces
- Cups to Pints
- Cups to Quarts
- Cups to Gallons
- Pints to ML
- Pints to Liters
- Pints to Fluid Ounces
- Pints to Cups
- Pints to Quarts
- Pints to Gallons
- Quarts to ML
- Quarts to Liters
- Quarts to Fluid Ounces
- Quarts to Cups
- Quarts to Pints
- Quarts to Gallons
- Gallons to ML
- Gallons to Liters
- Gallons to Fluid Ounces
- Gallons to Cups
- Gallons to Pints
- Gallons to Quarts
- Teaspoons to Tablespoons
- Tablespoons to Teaspoons
- Tablespoons to ML
- ML to Tablespoons
- Teaspoons to ML
- ML to Teaspoons
- Tablespoons to Cups
- Cups to Tablespoons
- Tablespoons to Fluid Ounces
- Fluid Ounces to Tablespoons
- Teaspoons to Cups
- Cups to Teaspoons
- UK Gallons to Liters
- Liters to UK Gallons
- UK Gallons to Gallons
- Gallons to UK Gallons
- UK Fluid Ounces to ML
- ML to UK Fluid Ounces
- UK Pints to ML
- ML to UK Pints
- Cubic Meters to Liters
- Liters to Cubic Meters
- Cubic Meters to Gallons
- Gallons to Cubic Meters
- Cubic Meters to Cubic Feet
- Cubic Feet to Cubic Meters
- Cubic Feet to Liters
- Liters to Cubic Feet
- CC to ML
- ML to CC
- Cubic Inches to CC
- CC to Cubic Inches
- Cubic Inches to Liters
- Liters to Cubic Inches
- Barrels to Liters
- Liters to Barrels
- Barrels to Gallons
- Gallons to Barrels
- Cubic Yards to Cubic Meters
- Cubic Meters to Cubic Yards
- Cubic Yards to Cubic Feet
- Cubic Feet to Cubic Yards
Area · 32
- Square Meters to Square Feet
- Square Meters to Hectares
- Square Meters to Acres
- Square Meters to Square KM
- Square Meters to Square Miles
- Square Feet to Square Meters
- Square Feet to Hectares
- Square Feet to Acres
- Hectares to Square Meters
- Hectares to Square Feet
- Hectares to Acres
- Hectares to Square KM
- Hectares to Square Miles
- Acres to Square Meters
- Acres to Square Feet
- Acres to Hectares
- Acres to Square KM
- Acres to Square Miles
- Square KM to Square Meters
- Square KM to Hectares
- Square KM to Acres
- Square KM to Square Miles
- Square Miles to Square Meters
- Square Miles to Hectares
- Square Miles to Acres
- Square Miles to Square KM
- Square Meters to Square Yards
- Square Yards to Square Meters
- Square Feet to Square Yards
- Square Yards to Square Feet
- Square CM to Square Inches
- Square Inches to Square CM
Speed · 20
Time · 26
- Seconds to Minutes
- Seconds to Hours
- Seconds to Days
- Minutes to Seconds
- Minutes to Hours
- Minutes to Days
- Hours to Seconds
- Hours to Minutes
- Hours to Days
- Days to Seconds
- Days to Minutes
- Days to Hours
- Milliseconds to Seconds
- Seconds to Milliseconds
- Days to Weeks
- Weeks to Days
- Years to Days
- Days to Years
- Months to Days
- Days to Months
- Months to Weeks
- Weeks to Months
- Hours to Weeks
- Weeks to Hours
- Years to Weeks
- Weeks to Years
Data · 30
- KB to MB
- KB to GB
- MB to KB
- MB to GB
- MB to TB
- GB to KB
- GB to MB
- GB to TB
- TB to MB
- TB to GB
- KiB to KB
- KB to KiB
- MiB to MB
- MB to MiB
- GiB to GB
- GB to GiB
- TiB to TB
- TB to TiB
- GiB to MiB
- MiB to GiB
- Bits to Bytes
- Bytes to Bits
- Megabits to MB
- MB to Megabits
- Gigabits to GB
- GB to Gigabits
- Gigabits to Megabits
- Megabits to Gigabits
- Bytes to KB
- KB to Bytes
Pressure · 22
Energy · 32
- kJ to KCAL
- kJ to kWh
- kJ to BTU
- kJ to Joules
- KCAL to kJ
- KCAL to kWh
- KCAL to BTU
- KCAL to Joules
- kWh to kJ
- kWh to KCAL
- kWh to BTU
- kWh to Joules
- BTU to kJ
- BTU to KCAL
- BTU to kWh
- BTU to Joules
- Joules to kJ
- Joules to KCAL
- Joules to kWh
- Joules to BTU
- Therms to kWh
- kWh to Therms
- MJ to kWh
- kWh to MJ
- Electronvolts to Joules
- Joules to Electronvolts
- Calories to Joules
- Joules to Calories
- Wh to Joules
- Joules to Wh
- Calories to KCAL
- KCAL to Calories
Power · 16
Fuel economy · 12
Angle · 12
Frequently asked questions
How accurate are these conversions?
Nearly every factor is exact by definition: the inch is exactly 2.54 cm and the pound exactly 0.45359237 kg, for example. Results are rounded to six significant digits for display. The few conventional values, such as average months or Mach at 20 °C, are marked on their pages.
Why do US and UK gallons, pints and mpg differ?
The US and the UK kept different gallons: the US gallon is 3.785 L and the imperial gallon 4.546 L. Pints, fluid ounces and miles per gallon follow from those, so each has its own page.
Is a GB 1,000 or 1,024 MB?
Both are in use. In SI units a gigabyte is 1,000 megabytes; the binary gibibyte (GiB) is 1,024 mebibytes. Drive makers use GB, while Windows shows binary values labeled GB. The data pages cover both.