Perimeter of a Square Calculator - Find Side & Diagonal

What Is the Perimeter of a Square?

The perimeter of a square is the total distance around its four equal sides. If you know the side length, diagonal, or area, you can find the perimeter instantly with our calculator.

Related tools: Square Area Calculator and Square Diagonal Calculator.

Perimeter Formulas

From side length $a$:

$$P = 4a$$

From diagonal $d$:

$$P = 2\sqrt{2} \times d$$

From area $A$:

$$P = 4\sqrt{A}$$

Worked Example

A square has side length 8 units. Its perimeter is $4 \times 8 = 32$ units.

Frequently Asked Questions

How do I find the perimeter of a square from its diagonal?

First find the side: a = d / √2. Then multiply by 4, or use P = 2√2 × d directly.

Can I find the side length from the perimeter?

Yes. Divide the perimeter by 4: a = P / 4. For example, if P = 20, then a = 5.

What is the perimeter of a square with area 64?

The side is √64 = 8, so the perimeter is 4 × 8 = 32 units.

Is the perimeter the same as the circumference?

Perimeter applies to polygons like squares. Circumference applies to circles. Both measure the outer boundary length.

Report

Square Perimeter Calculator

What Is the Perimeter of a Square?

Perimeter Formulas

Worked Example

Frequently Asked Questions

Related Tools

Recent Visits