Area of a Square Calculator
A = s² where s is the side length.
Result
Area
25.0000 units²
Diagonal: 7.0711.
- Side5
- Perimeter20.0000
- Diagonals·√27.0711
Step-by-step
- Area = s² = 5² = 25.0000.
How to use this calculator
- Enter the side length.
- Read the area, perimeter, and diagonal.
About this calculator
The simplest area formula. Squares are special rectangles where both sides are equal, and special rhombuses where all four sides are equal AND all corners are right angles. The diagonal of a square is s√2 ≈ 1.414s.
Frequently asked
s = √A. So an 81-unit² square has side √81 = 9.
Related calculators
Area of a Rectangle Calculator
A = length × width.
Area of a Circle Calculator
Calculate the area of a circle given its radius (or diameter). A = πr².
Area of a Rhombus Calculator
A = (d₁ × d₂) / 2 — half the product of the diagonals.
Area of a Triangle Calculator
Three formulas: base × height ÷ 2, SAS (two sides and angle), and Heron's (three sides).
Area of a Trapezoid Calculator
A = ½ × (parallel side a + parallel side b) × height.
Area of a Parallelogram Calculator
A = base × height (perpendicular height).