Circumference of a circle – Calculator Provide data for calculations Radius (r) cal (in)centimeter (cm)decymetr (dm)jard (yd)electric wirekilometers (km)meters (m)English mile (me)dear sea (nmi)millimeter (mm)english foot (ft)Inch sunShaku shaku Surface (A) akr (acre)Withsquare inch (sq in)square centimeter (cm²)hectare (ha)square yard (yd²)square kilometer (km²)square meter (m²)square milesquare millimeter (mm²)square foot (ft²)Tsubo tsuboAyumu buTatami jō Circuit (C) cal (in)centimeter (cm)decymetr (dm)jard (yd)electric wirekilometers (km)meters (m)English mile (me)dear sea (nmi)millimeter (mm)english foot (ft)Inch sunShaku shaku Diameter (d) cal (in)centimeter (cm)decymetr (dm)jard (yd)electric wirekilometers (km)meters (m)English mile (me)dear sea (nmi)millimeter (mm)english foot (ft)Inch sunShaku shaku see also: Area of the circle Circumference of a circle