With this simple square calculator, you can find out all the parameters in the blink of an eye. Fill in one box, and the calculator will display all the remaining parameters: side, area, perimeter, and diagonal. Scroll down if you want to remind yourself about the basic formulas in square calculations.

What is a square?

A square is a quadrilateral with four equal sides and four equal angles (right angles = 90°). It's one of the most basic shapes. It's a special case of a rhombus, a kite, a trapezoid, a parallelogram and a rectangle so it has all properties of these shapes.

Square calc: find P (perimeter)

Perimeter of a square is equal to sum of all sides. Because square has all four sides equal, the perimeter is then:
  • perimeter = a + a + a + a = 4 * a

Square calc: find A (area)

The area of a square is the product of the length of its sides:

  • area = a * a = a², where a is a square side

The term square is used to describe multiplying the value by itself, raising it to the second power.

Square calc: find d (diagonal)

Diagonals of a square are equal in length, they bisect the angles and they are the perpendicular bisectors of each other. The diagonal d of a square is equal to side length times square root of 2:

d = a√2

So, for example, if the square side is equal to 2 in, then the diagonal is 2√2 ≈ 2.828 in.

Square properties

Square is a really unique shape. Here we sum up a few important features:

  • Equality: all four angles are equal, all four sides of a square are equal, both diagonals are of the same length.
  • Bisection: diagonals bisect each other and bisect square angles.
  • Perpendicularity: all square angles are equal to 90° and the diagonals meet at 90°.
Hanna Pamuła, PhD candidate

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Square Calc: find A, P, d