About this calculator
Enter both.
How to use it
- Enter the number of sides.
- Enter the side length.
- Read the results.
The formula
Area = ½ × perimeter × apothem; interior angle = 180° − 360° ÷ n
- apothem
- distance from centre to a side
- n
- number of sides
Worked example
A hexagon with side 4
- Apothem ≈ 3.464; area ≈ 41.57.
- Interior angle 120°; 9 diagonals.
What the result means
Hexagons tile a floor perfectly, which is why bees use them.
Assumptions
- All lengths in the same unit.
Limitations
- Results are rounded to 10 significant figures.
Frequently asked questions
What is the interior angle of a regular hexagon?
120°.
How many diagonals does a polygon have?
n(n − 3) ÷ 2.
What is the sum of interior angles?
(n − 2) × 180°.
Last reviewed on 3 October 2026. Found a mistake? Tell us.