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Unit Converter
Convert over 400 units of length, weight, temperature, volume, speed, pressure, energy and more. Or just type a conversion like “5 ft 10 in to cm”.
Convert meters to feet
Popular conversions
Length
- Centimeters to Inches
- Inches to Centimeters
- Millimeters to Inches
- Inches to Millimeters
- Meters to Feet
- Feet to Meters
- Kilometers to Miles
- Miles to Kilometers
- Feet to Centimeters
- Centimeters to Feet
- Meters to Yards
- Yards to Meters
- Inches to Feet
- Feet to Inches
- Meters to Inches
- Nautical Miles to Kilometers
- Light-years to Kilometers
- Micrometers to Millimeters
Weight and mass
- Kilograms to Pounds
- Pounds to Kilograms
- Grams to Ounces
- Ounces to Grams
- Stone to Kilograms
- Kilograms to Stone
- Stone to Pounds
- Grams to Pounds
- Pounds to Grams
- Ounces to Pounds
- Pounds to Ounces
- US Tons to Tonnes
- Tonnes to US Tons
- Troy Ounces to Grams
- Carats to Grams
- Milligrams to Grams
- Micrograms to Milligrams
- Tolas to Grams
Temperature
Volume
- Liters to Gallons
- Gallons to Liters
- Milliliters to Fluid Ounces
- Fluid Ounces to Milliliters
- Cups to Milliliters
- Milliliters to Cups
- Tablespoons to Milliliters
- Teaspoons to Milliliters
- Cups to Fluid Ounces
- Tablespoons to Teaspoons
- UK Gallons to Liters
- Liters to UK Gallons
- Cubic Feet to Cubic Meters
- Cubic Meters to Cubic Feet
- Quarts to Liters
- Cubic Meters to Liters
- UK Pints to Milliliters
Area
Speed
Data storage
Data transfer rate
Pressure
Energy
Power
Fuel economy
Density and concentration
Flow rate
Radioactivity
Radiation: equivalent dose
Ratio and parts
Every unit, by category
448 units in 36 categories. Choose one to load it into the converter.
Length
Distances and sizes, from nanometres to light-years, including US survey and East Asian units.
Weight and mass
Metric, imperial, troy and traditional weights from Asia, India and Russia.
Temperature
Celsius, Fahrenheit and Kelvin, plus the historical Rankine, Réaumur, Rømer, Newton and Delisle scales.
Volume
Metric, US and imperial liquid measures, cooking measures and traditional Japanese and Russian units.
Area
Land and floor areas, including acres, hectares and regional units like the tsubo, mu, rai and marla.
Speed
Speeds for roads, the sea and the sky, and running pace in minutes per kilometre or mile.
Time
From nanoseconds to millennia. Months and years are Gregorian averages.
Data storage
Bits and bytes, in both decimal (kB, MB, GB) and binary (KiB, MiB, GiB) sizes.
Data transfer rate
Connection and transfer speeds in bits or bytes per second.
Pressure
Tyre, weather, blood and engineering pressures: psi, bar, kPa, atmospheres, mmHg and more.
Energy
Joules, calories, kilowatt-hours, BTUs and electronvolts, down to the scale of atoms and up to TNT.
Power
Watts, horsepower (mechanical, metric and electric), BTU per hour and tons of refrigeration.
Force
Newtons, pounds-force, kilograms-force, dynes and kips.
Angle
Degrees, radians, gradians, arcminutes and the mils used on maps and gun sights.
Frequency
Hertz, revolutions per minute and angular velocity.
Fuel economy
Miles per gallon (US and UK), kilometres per litre and litres per 100 km.
Density and concentration
Mass per volume: material densities and mass concentrations like mg/dL and g/L.
Torque
Newton metres, pound-feet, inch-pounds and kilogram-force metres.
Flow rate
Volume per unit of time: pumps, pipes, air handling and oil production.
Acceleration
Metres per second squared, g-force and the gal used in geophysics.
Electric current
Amperes, from nanoamps to kiloamps.
Voltage
Volts, from microvolts to megavolts.
Electrical resistance
Ohms, from milliohms to gigaohms.
Capacitance
Farads, down to the picofarads on component markings.
Electric charge
Coulombs and the milliamp-hours printed on batteries.
Magnetic flux density
Tesla and gauss, from MRI scanners to the Earth's field.
Illuminance
Lux and foot-candles, for lighting design and photography.
Radioactivity
Becquerels and curies.
Radiation: absorbed dose
Grays and rads: energy absorbed per kilogram.
Radiation: equivalent dose
Sieverts and rem: absorbed dose weighted for its effect on the body.
Viscosity (dynamic)
Pascal-seconds, poise and centipoise.
Viscosity (kinematic)
Stokes, centistokes and square metres per second.
Amount of substance
Moles and the number of particles they contain.
Molar concentration
Molarity: moles per litre, from molar down to picomolar.
Ratio and parts
Percentages, per mille, basis points and parts per million, billion or trillion.
Specific energy
Energy per mass: fuel heating values and battery energy density.
Questions
What can I type in the conversion box?
A number, a unit and the unit you want, like “5 ft 10 in to cm”, “72 °F in C”, “3 cups to ml” or “60 mph to km/h”. It understands symbols, full names, plurals and British spellings, adds mixed units such as feet and inches together, and accepts fractions like 1 1/2 or ½. Leave out the second unit to see the value in every common unit.
Which units does the converter know?
448 units in 36 categories: everyday measures of length, weight, volume, temperature, area, speed and time, technical ones like pressure, energy, torque, viscosity and radiation, and regional units such as the Japanese tsubo, Chinese jin, Indian tola and Russian verst.
How accurate are the conversions?
They use exact definitions wherever one exists (an inch is exactly 2.54 cm, a pound exactly 0.45359237 kg) and show 10 significant figures. A few units have varied over time or by region; those are marked, and the value in common modern use is the one used.
Are US and UK gallons the same?
No. A US gallon is 3.785 litres and a UK (imperial) gallon is 4.546 litres, and pints, quarts and fluid ounces differ in the same way. Both are listed separately, and the plain names mean the US ones.
Is a kilobyte 1000 or 1024 bytes?
A kilobyte (kB) is 1000 bytes, as with every other metric prefix. 1024 bytes is a kibibyte (KiB), and the same goes for MB and MiB, GB and GiB. Disk makers use the first; many operating systems show the second, which is why a 1 TB drive shows up as about 931 GB.
Why can't I convert cups to grams, or kilograms to litres?
Volume and weight measure different things, so the answer depends on what's being measured: a cup of flour weighs far less than a cup of honey. The converter only converts between units of the same kind, and tells you when two units can't be converted.
About
A converter for every unit you’re likely to meet, and plenty you aren’t: metric and imperial, US and UK, scientific and engineering, and traditional units from Japan, China, India, Thailand and Russia.
Pick a category and two units, or type a conversion the way you’d say it: “72 °F in C”, “3 cups to ml”, “12 st 4 lb to kg”. It understands symbols, names, plurals and British spellings, adds mixed units like feet and inches together, and tells you when two units can’t be converted because they measure different things.
How it works
- Exact definitions: each unit is defined by how it relates to one base unit in its category, built from exact definitions wherever they exist. An inch is exactly 2.54 cm and a pound exactly 0.45359237 kg, so conversions stay exact however many steps they take.
- More than multiplication: temperatures have offsets (°F = °C × 1.8 + 32), and fuel economy and running pace are inverses (L/100 km = 235.215 ÷ mpg). Every result shows the formula it used.
- Reading what you type: when a symbol could mean two things, the unit you’re converting to decides. “oz to ml” uses fluid ounces; “oz to g” uses ounces of weight.
- Precision: results show 10 significant figures, with scientific notation for very large and very small numbers.
- Popular conversions like feet to meters and Celsius to Fahrenheit have their own pages, with the formula, a worked example and a conversion table.
Notes
Some units have varied by time and place (the marla, the maund and the cubit among them). Those are marked, and the value in common modern use is the one used. Months and years are Gregorian averages. Converting between volume and weight, such as cups of flour to grams, depends on the ingredient, so the converter doesn’t try.
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