Area of a Square Calculator

Your details

The length of one side of the square.
cm
Area
25cm²

Surface area enclosed by the square

Side length (a)5cm
Perimeter (P)20cm
Diagonal (d)7.0711cm
Circumradius (R)3.5355cm
Inradius (r)2.5cm

Area is 25.0000 cm² for a side of 5.0000 cm.

  • The diagonal is 7.0711 cm, which is the side times the square root of 2 (about 1.41421).
  • The perimeter is 20.0000 cm - four times the side length.
  • The inscribed circle radius is 2.5000 cm and the circumscribed circle radius is 3.5355 cm.
  • Doubling the side length quadruples the area: a square with side 10.00 cm would have an area of 100.0000 cm².

Next stepUse the "Solve from" dropdown to work backwards from the area, diagonal, or any other known measurement.

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