What do you need to convert?
Type an amount and two units and press Enter — or pick one below.
Popular conversions
- USD to EUR 1 = 0.87
- EUR to USD 1 = 1.15
- cm to in 1 = 0.39370079
- m to ft 1 = 3.28084
- kg to lb 1 = 2.204623
- lb to kg 1 = 0.45359237
- °C to °F Temperature
- °F to °C Temperature
- L to US gal 1 = 0.26417205
- US gal to L 1 = 3.785412
- m² to ft² 1 = 10.76391
- ft² to m² 1 = 0.09290304
- km/h to mph 1 = 0.62137119
- mph to km/h 1 = 1.609344
- bar to psi 1 = 14.503774
- psi to bar 1 = 0.06894757
- kWh to J 1 = 3,600,000
- cal to J 1 = 4.184
- kW to hp 1 = 1.341022
- hp to kW 1 = 0.74569987
- h to min 1 = 60
- d to h 1 = 24
- MB to GB 1 = 0.001
- GB to MB 1 = 1,000
- ° to rad 1 = 0.01745329
- rad to ° 1 = 57.29578
- mpg (US) to L/100 km Fuel economy
- L/100 km to mpg (US) Fuel economy
All converters
Everyday
- Currency European Central Bank reference rates, updated each working day.
- Length Metres, feet, inches, miles and the rest of the distance family.
- Weight & mass Kilograms to pounds, grams to ounces, and the three different tons.
- Temperature Celsius, Fahrenheit, Kelvin and Rankine — offsets handled properly.
- Volume Litres, cups, pints and gallons — US and Imperial kept separate.
- Time Seconds to years, with a plain-English breakdown of the leftovers.
Property & land
Motion & science
- Speed km/h, mph, knots, metres per second.
- Pressure Bar, psi, pascal, atmospheres — tyres to weather charts.
- Energy Joules, calories, kilowatt-hours, BTU.
- Power Watts, kilowatts, horsepower — metric and mechanical.
- Angle Degrees, radians, gradians, arcminutes.
- Fuel economy mpg and L/100 km — an inverse relationship, not a simple factor.
Why this one
Most conversion sites give you a number and stop. This one shows the arithmetic underneath it, marks which factors are exact by definition rather than measured, and refuses to pretend that a US gallon and an Imperial gallon are the same thing.
Where a conversion has a trap in it — the three different tons, megabytes against mebibytes, miles per gallon running backwards — the page explains the trap instead of averaging it away.