Perimeter Calculator
Calculate perimeter for common shapes quickly.
How to Do It Manually
Perimeter is the total length of all sides of a shape.
Square: 4s | Rectangle: 2(l + w) | Triangle: a + b + c | Circle (circumference): 2πr
Frequently Asked Questions
What is the difference between perimeter and area?
Perimeter is the total boundary length (1D measurement). Area is the space enclosed within (2D measurement).