Area of a Circle CalculatorFind the area of a circle from its radius, diameter or circumference, in the unit of your choice.RadiusDiameterCircumferenceRadiusMillimetre (mm)Centimetre (cm)Metre (m)Kilometre (km)Inch (in)Foot (ft)Yard (yd)DiameterMillimetre (mm)Centimetre (cm)Metre (m)Kilometre (km)Inch (in)Foot (ft)Yard (yd)CircumferenceMillimetre (mm)Centimetre (cm)Metre (m)Kilometre (km)Inch (in)Foot (ft)Yard (yd)Area-ResetCopy calculation linkLink copied