How it works
Find area and perimeter of a convex regular polygon. All sides and all interior angles must be equal.
A = na²/[4tan(π/n)]; P = na
Worked example
Show example inputs and result
Number of sides: 6 · Side length: 4.
- Area
- 41.56921938
- Perimeter
- 24
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy