This free online calculator will help you to find the perimeter of a rectangle.

Using this online calculator, you will receive a detailed step-by-step solution to your problem, which will help you understand the algorithm how to find rectangle perimeter.

Calculator

Guide

Some theory

Calculation of rectangle perimeter

a =

b =

Entering data into the perimeter of a rectangle calculator

You can input only integer numbers or fractions in this online calculator. More in-depth information read at these rules.

N.B. In online calculator you can use the value in the same units of measurement!

If you have any difficulties with units conversion, you can use the length converter.

Additional features of a rectangle perimeter calculator

Use and keys on keyboard to move between field in calculator.

Theory. Perimeter of a rectangle

Rectangle is any quadrilateral with four right angles.

The perimeter of the rectangle ABCD is equal to twice the sum of the sides adjacent to one corner.

P = 2(a + b)

where P - perimeter of a rectangle,
a - length of first rectangle side,
b - length of second rectangle side.

You can input only integer numbers, decimals or fractions in this online calculator (-2.4, 5/7, ...). More in-depth information read at these rules.