Perimeter Calculator
Calculate the perimeter of a rectangle, circle or triangle.
Result
Results are estimates for general information only and are not professional advice.
Perimeter formulas
The perimeter is the total distance around a shape. A rectangle is 2 × (width + height), a circle's perimeter (circumference) is 2 × π × radius, and a triangle is the sum of its three sides. Choose a shape and enter the values.
Frequently Asked Questions
What is the Perimeter Calculator?
Calculate the perimeter of a rectangle, circle or triangle. It runs instantly in your browser and is completely free.
Is the Perimeter Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the Perimeter Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.