The perimeter of a square is the total length around its edge — the sum of all four equal sides. You need this whenever you want to know how much material goes around a square surface, like window frames, fences or borders.

The Formula

P = 4 × t

• P — perimeter of the square (cm, m, etc.)
• t — length of one side (all four sides are equal)

Since all four sides of a square are the same length, you just measure one side and multiply by 4. This makes the square the easiest shape to measure around.

Step-by-Step Example