Square Area Calculator
Find the area of a square from its side length or perimeter with this free calculator that gives instant results in your browser.
Enter Values
Shape
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter the side length.
- Press Calculate.
How it works
A square has four equal sides, so its area is side × side (side²) and its perimeter is 4 × side. With the side in metres the area is in square metres (m²).
Worked example
5 m side. area 25 m², perimeter 20 m.
Frequently asked questions
What's the difference between area and perimeter?
Area (side²) is the space inside the square in m²; perimeter (4 × side) is the distance around the outside in metres.
How do I find the side from the area?
Take the square root of the area: side = √area. A 25 m² square has 5 m sides.
Related tools
- Rectangle Area Calculator
- Triangle Area Calculator
- Equilateral Triangle Area Calculator
- Regular Polygon Area Calculator
- Ellipse Area Calculator
- Parallelogram Area Calculator
Explore more in Geometry, Shape, Area & Volume.
Cite this tool
Zerdly. (2026). Square Area Calculator. Retrieved from https://www.zerdly.com/tools/square-area-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.