Perimeter Calculator
Calculate the perimeter of a rectangle or square.
How to Use the Perimeter Calculator
Select or enter the shape dimensions requested by the tool to calculate the total distance around its boundary.
Practical Example
A rectangle measuring 10 units by 6 units has a perimeter of 32 units.
Factors That Affect the Result
Use consistent units and accurate side lengths. Different shapes use different perimeter formulas, so make sure the selected shape matches your measurements.
Frequently Asked Questions
What is perimeter?
Perimeter is the total distance around a two-dimensional shape.
Is perimeter the same as area?
No. Perimeter measures boundary length, while area measures surface coverage.
Can I use centimeters or meters?
Yes, any consistent length unit can be used.
Related Tools
Using Perimeter Calculations
Perimeter is the total distance around a two-dimensional shape. The correct formula depends on the shape: a rectangle uses 2(l + w), a square uses 4s, and a circle uses circumference 2πr.
Perimeter is useful for fencing, trim, borders and edge material. It is measured in linear units, not square units. For irregular outlines, add the lengths of each boundary segment and include curves with an appropriate arc or circumference calculation rather than substituting area.