Square Calculator
Calculate the area, perimeter, and diagonal of a square from its side length.
Calculate
Enter your values below.
Result
Area
0
Perimeter
0
Diagonal
0
Formula used
Area = s², Perimeter = 4s, Diagonal = s√2
Example: Side 6 → area = 36, perimeter = 24, diagonal ≈ 8.49.
How to use this calculator
- Enter Side length.
- Press Calculate to see your result instantly.
FAQ
Frequently asked questions
How is a square's diagonal calculated?
By the Pythagorean theorem: since both sides equal s, the diagonal is s√2.
What's the difference between a square and rectangle calculator?
A square has all four sides equal, so only one measurement is needed instead of two.
Can side length be a decimal?
Yes, decimals are fully supported.
What units is the area in?
Your linear unit, squared.