What do I need to enter?

Just the length of one side of the square — all sides are equal, so one side is enough.

What results does it show?

Area, perimeter and diagonal of the square, updated live as you type.

Area = side squared, Perimeter = 4 times side, Diagonal = side times the square root of 2.

Yes. It is free, needs no signup, and runs in your browser.

Enter one side of your square — get area, perimeter and diagonal. All sides are equal, so one side is enough.

Side

Enter values — the result will show here live.

Enter the length of the square's side.
Area, perimeter and diagonal will appear. For marla/land math: if the side is in feet, the area will be in square feet.

Note: Formulas: Area = side², Perimeter = 4 x side, Diagonal = side x √2.