Perimeter of a Pentagon Calculator
Find the perimeter of a regular pentagon from one side length, or an irregular pentagon by summing all five side lengths.
Input
All five sides are equal. Enter one side length.
Enter all five side lengths individually.
Result
Enter values and click Calculate.
Perimeter
same unit as input
Step-by-step working
Summary
Find the perimeter of a regular pentagon from one side length, or an irregular pentagon by summing all five side lengths.
How it works
- Choose Regular or Irregular mode using the tabs.
- Regular: enter the single side length and click Calculate.
- Irregular: enter all five side lengths (a through e) and click Calculate.
- The result panel shows the perimeter and full step-by-step working.
- Click Reset to clear the form and start over.
Use cases
- Geometry homework and exam practice involving pentagons.
- Architecture and design projects with pentagonal floor plans.
- Fencing, framing, or tiling work on pentagonal plots.
- Verifying manual perimeter calculations quickly.
- Teaching the difference between regular and irregular polygons.
- Engineering tasks requiring precise five-sided boundary measurements.
Frequently Asked Questions
Last updated: 2026-06-13 ·
Reviewed by Nham Vu