Conversion

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Area Converter

From hectares to square metres or from acres to m²: convert any area exactly to the unit you need for land, a plot or a building plan.

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Euro to Dollar Converter

The exchange rate between euro and dollar changes every trading day. The rate field autofills with the current rate, based on the European Central Bank's daily reference rate, but you can always override it yourself to calculate with a different rate.

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Data Storage Converter

How many KB are in an MB, and how many MB in a GB? Convert storage between bytes, KB, MB, GB, TB and PB. Pick the binary standard (1024, what your operating system uses) or the decimal standard (1000, what manufacturers print on the box).

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Electrical Converter

From ampere to watt, from kW to horsepower or from watt to kWh: convert the key electrical units. For ampere–watt you enter the voltage (usually 230 V in Europe), and for energy the time in hours. That way you always get a correct, grounded answer instead of a rough rule of thumb.

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Length Converter

From a DIY project in inches to a distance in miles on a US road sign: convert any length exactly to the unit you need. This calculator covers both the metric system (millimetre to kilometre) and the imperial/US system (inch, foot, yard, mile).

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Pressure Converter

Tyre pressure in psi while your pump shows bar? Convert pressure exactly between psi, bar, kPa, pascal and atmospheres — for the car, the bike, a compressor or an engineering job.

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Speed Converter

From a US speed limit in mph to wind speed in knots while sailing: convert any speed exactly between km/h, mph, m/s and knots. Handy for travel, sports, weather reports and shipping.

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Temperature Converter

Celsius, Fahrenheit and Kelvin are the three most widely used temperature scales in the world. Whether you are reading a US recipe, checking an American weather report or working through a physics problem, this calculator instantly and exactly converts any value to the scale you need.

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Weight Converter

From a US recipe in ounces to your own body weight in stone: weight is expressed in very different units around the world. This calculator converts any weight exactly to the unit you need, from milligrams to tonnes.