Geometry
Pentagon Calculator
Lets users solve and check pentagon instantly with formula, steps and examples — no manual math.
Enter your details
units
Your result
Area
61.9372 sq units
Pentagon: area = 61.94, perimeter = 30, interior angle = 108°.
Perimeter
30 units
Apothem
4.1291 units
Interior angle
108 °
About this calculator
A regular pentagon (5 equal sides): area = (n·s²)/(4·tan(π/n)), perimeter = n·s, interior angle = (n−2)·180/n.
Frequently asked questions
Why CalcBreeze
- ✔ Verified formulas, instant recalculation
- ✔ Works on every device, no signup needed
- ✔ Save, share & export results
- ✔ 1100+ calculators across 50+ categories
- ✔ Pixel-consistent design across every tool