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

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 triangle perimeter.

Calculator

Guide

Some theory

Calculation of triangle perimeter

Enter length of triangle sides:

a =

b =

c =

Entering data into the perimeter of a triangle 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 triangle perimeter calculator

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

Theory. Perimeter of a triangle

The perimeter of the triangle

∆ABC is the sum of the lengths of its sides:

P = a + b + c

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.