# Perimeter of Rhombus

To calculate the **perimeter of a rhombus** we need to know a side length. A rhombus is a shape with four equal sides. The formula to calculate the **perimeter of a rhombus** is same like the formula of a square. The perimeter means the sum of all side lengths. For example a length of a fence around a rhombic garden. The elementary unit is one metre (1 m).

## Perimeter of Rhombus - formula

**Perimeter of Rhombus** = 4 × side length

P = 4 × a