Formula
Area = side²
If you only know the diagonal, the area is d² / 2 because the diagonal splits the square into two right triangles.
Example
A square with side 8 has area 8² = 64 square units.
Frequently Asked Questions
What is the unit of the result?
The result is in square units of the input, such as square meters, square feet, or square inches.
Can I use the diagonal instead?
Yes. If the diagonal is known, use d² / 2 to find the area.
Is this different from perimeter?
Yes. Perimeter measures the outside edge, while area measures the total enclosed space.