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Surface/area calculator

  metric   GB & USA
squared millimeter squared inch
squared centimeter squared feet
squared meter squared yard
are acre
hectare squared mile
squared kilometer signification:

Use this convertor to convert the units of surface from American/English units to the metrical unit system (SI).

In the calculator mentioned below, you can calculate the area of a circle. You need to fill in the radius. You can also calculate the radius if you fill in the area. It does not matter in what units you fill in. You only have to know that the unit of the surface is derived of the length. If you fill in m, than the surface is m2.


Radius r Surface of circle