Rectangle perimeter Calculator

How to calculate rectangle perimeter

This tool calculates rectangle perimeter from Length, Width. Enter each quantity in its labelled field, then use the formula below to check the calculation.

Formula

2 × (length + width)

Worked example

Length

8

Width

5

Applying the formula to these values gives 26 units.

What should I check?

Find the area, perimeter, surface area or volume of common shapes. Use consistent length units: metres produce square metres for areas and cubic metres for volumes.

Use the reset button to restore this example. Your inputs are processed in this browser and are not included in a shared calculator link. See our methodology and limitations.