Square Area Calculator
Calculate the area of a square from its side length. Formula: Area = side^2. Also computes the perimeter. Simple, instant, free.
How to use this tool
- Enter side length in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your area and the full breakdown beneath it.
Formula
Area = side^2; Perimeter = 4 x side
How it works
A square has four equal sides. Multiply the side length by itself to get the area. Multiply by 4 for the perimeter.
Worked example
Square tile with side 5 m
- Area = 5^2 = 25 m^2
- Perimeter = 4 x 5 = 20 m
25 m^2
Common mistakes to avoid
- Multiplying the side by 2 instead of squaring it (side x 2 vs side^2), which gives a linear measure rather than area.
- Entering the diagonal instead of the side length; if you have the diagonal d, the area is d^2/2.
- Confusing perimeter (4 x side) with area (side^2) and reporting the wrong value.
Key terms
- What makes a square special?
- All four sides are equal and all four angles are 90 degrees.
Frequently asked questions
- I know the area. How do I find the side length?
- Take the square root of the area: side = sqrt(Area).
- I measured the diagonal of my square room. Can I still find the area?
- Yes. side = diagonal / sqrt(2), then Area = side^2. Or directly: Area = diagonal^2 / 2.
- What is the difference between a square and a rhombus?
- Both have four equal sides, but a square has four right angles while a rhombus does not unless it is also a square.