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Triangle Calculator
Solve any triangle from three sides or two sides and the angle between them: angles, area, perimeter and type.
Hexagon Calculator
Calculate the area, perimeter, apothem, diagonals and circumradius of a regular hexagon from its side length, or work back from the area.
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How to use this calculator
Enter your values after choosing the type of calculation in the tabs. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.
Regular hexagon formulas
Area = (3√3 ÷ 2) × a² ≈ 2.598 × a²
Perimeter = 6a
Apothem = (√3 ÷ 2) × a
Long diagonal = 2a Short diagonal = √3 × a
A regular hexagon is made of six equilateral triangles, so the circumradius equals the side length. Example: side 10 in → area 259.81 in², perimeter 60 in, flat-to-flat width 17.32 in.
Where hexagons show up
Hex tiles and pavers, hex bolts and wrenches (measured flat-to-flat), honeycomb, gazebos and garden beds. For a hexagonal tile, the short diagonal is the width you measure between flat sides; the long diagonal goes corner to corner.
Hexagon properties
| Property | Value |
|---|---|
| Sides / vertices | 6 |
| Interior angle | 120° |
| Sum of interior angles | 720° |
| Number of diagonals | 9 |
| Exterior angle | 60° |
Frequently asked questions
How do you find the area of a hexagon?
Multiply the side length squared by 2.598 (3√3 ÷ 2). Side 4 → 41.57.
How is a hex bolt size measured?
Flat to flat, which is the short diagonal: √3 × side.
About this tool
- Written by
- [Author: to be assigned]
- Reviewed by
- Formula tests passed · human review pending
- Last updated
- 31 Oct 2026
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