About the Square Calculator
Calculate the area, perimeter and diagonal of a square from any one of side, area, perimeter or diagonal.
Also known as: square area, area of a square, square perimeter, side of square.
How to use this calculator
- Enter i know the, value.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
A = s² · P = 4s · d = s√2
Worked example
Using the values pre-filled in the calculator above:
- I know the: Side
- Value = 6
the calculator returns:
- Area: 36
- Side: 6
- Perimeter: 24
- Diagonal: 8.485281