Math & Number Tools Calculator
Regular Hexagon Calculator: Area, Perimeter & Dimensions
Calculate regular hexagon area, perimeter, side length, apothem, radius, diagonal, and height with formulas for geometry and design.
Enter one known measurement to find every dimension of a regular hexagon. The diagram and worked steps update as you type.
Known measurement
Live geometry diagram
Six equilateral triangles. Schematic diagram; not to scale. Choose a result or a line in the diagram to use it as the known measurement.
Results
How it was calculated
This calculator assumes six equal sides and six 120° interior angles.
Optional hexagonal tile estimator
Regular hexagon formulas
A regular hexagon has six equal sides and can be split into six equilateral triangles, which makes the formulas predictable.
- Perimeter = 6 x side length.
- Area = 3 x sqrt(3) x side squared / 2.
- Long diagonal = 2 x side length.
Hexagon area calculator
Use the area formula when you know the side length, apothem, or perimeter. Keep all length units consistent.
- Area = perimeter x apothem / 2.
- Apothem = side x sqrt(3) / 2.
- Circumradius of a regular hexagon equals the side length.
When to use it
Hexagon calculations are useful for geometry homework, tile layouts, honeycomb patterns, CAD sketches, design work, and regular polygon checks.
- Use side length when a problem gives one edge.
- Use apothem for area from center-to-side distance.
- Round only after calculating the final result.
Related calculators
These geometry tools help when the shape or formula changes.
Hexagon Calculator FAQ
How do I find the area of a regular hexagon?
Use area = 3 x sqrt(3) x side squared / 2, or area = perimeter x apothem / 2.
How do I find hexagon perimeter?
For a regular hexagon, multiply the side length by 6.
What is the long diagonal of a regular hexagon?
The long diagonal is twice the side length.
Is the radius equal to the side in a regular hexagon?
Yes. The circumradius of a regular hexagon equals its side length.
Can this calculator handle irregular hexagons?
It is intended for regular hexagons. Irregular hexagons need additional side, angle, or coordinate data.
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