Math & Science
Perimeter Calculator
Calculate perimeter of various shapes
Created and maintained by: CalcTago Editorial TeamLast updated: 2026-02-13
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
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Frequently asked questions
What does the Perimeter Calculator do?
It helps you calculate perimeter of various shapes.
What inputs do I need?
Enter Shape, Length, Width, Side A, Side B, Side C, and Radius.
Are decimals supported?
Yes, you can use decimal values where appropriate.
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About this tool
This Perimeter Calculator turns your inputs into practical results. Provide Shape, Length, and Width to calculate Perimeter and Shape.
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.