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Calculators :: Plane Geometry :: Square Calculator

Enter one known value and calculate the side, area, perimeter or diagonal of a square. You will get solution with step-by-step explanation.

Square Calculator

Input value you know and the value you want to find. You can enter either integers (10), decimal numbers(10.12) or FRACTIONS(10/3).

0 1 2 3 4 5 6 7 8 9 / . del
Enter known values:
side a =
area A =
perimeter P =
diagonal d =

Select value to find:
side a
area A
perimeter P
diagonal d
Show me an explanation.

Formulas for Square

To calculate missing value in square, based on one known value, you need to remember just three formulas.

square diagram
F1: $$ P = 4 \cdot a $$

a = side

d = diagonal

A = area

P = perimeter

F2: $$ A = a^2 $$
F3: $$ d = a \cdot \sqrt{2} $$

The diagram at the right shows when to use each of these formulas.

Example 1:

If you are given diagonal d and you want to calculate side a, then you need to use formula which connects d and a.

Example 2:

If you are given area A and you want to calculate perimeter P then you need to make two steps to calculate perimeter. In first step you apply formula which connects area A and side a after that use formula which connects side a and perimeter P.

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