Square Calculator
Compute area, perimeter, diagonal and inradius of a square from its side length.
About Square Calculator
A square has all four sides equal and all angles 90°. Its diagonal is s√2 and its inradius (inscribed circle radius) is s/2.
Formulas
Area
A = s²
- s
- Side length
Diagonal
d = s√2
- s
- Side length
Worked example
With the default values below, Square Calculator returns Area of 64.0000. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Side Lengthminimum 0 units
- 8 units
Results
- Area
- 64.0000 sq units
- Perimeter
- 32.0000 units
- Diagonal
- 11.3137 units
- Inradius
- 4.0000 units
Step by step
- 1Area= 64
- 2Perimeter= 32
- 3Diagonal= 11.3137
Assumptions and limits
- The result is derived only from the single input listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
What is the relationship between diagonal and side?
The diagonal is always √2 ≈ 1.414 times the side length.
How do I find the side from the area?
Take the square root of the area: s = √A.