Square Calculator
Enter any single measurement of a square — side, area, perimeter or diagonal — and get the rest.
Square
Formulas
area = s²
perimeter = 4s
diagonal = s√2 ≈ 1.41421 × s
side from area = √A
Worked example
A square room of 50 m²
- s = √50 ≈ 7.071 m
- Perimeter: 4 × 7.071 ≈ 28.28 m
- Diagonal: 7.071 × √2 = 10 m
Each wall is about 7.07 m long.
A handy fact
The diagonal of a square is always √2 times its side, so a square’s diagonal squared is exactly twice its area. That makes it easy to check: a 10 m diagonal means a 50 m² square.