Regular Hexagon Area Calculator

How it is calculated

For a regular hexagon, with six equal sides and equal angles, the area is A = (3√3 / 2) × s² and the perimeter is P = 6 × s, where s is the side length. The factor 3√3 / 2 is about 2.598, because a regular hexagon splits into six equilateral triangles, each with area (√3 / 4) × s².

The side can be in any unit; the result is labelled 'units' and 'units²', so read it as the same unit you entered (centimetres give cm², metres give m²). Results are rounded to two decimals, and the side must be greater than zero. The tool needs a regular hexagon: an irregular six-sided shape cannot be measured from one side.

Common mistakes

• Entering the distance between two opposite flat sides (the width across flats) as the side. The side is one edge, and the across-flats distance is about 1.732 times larger.
• Entering the corner-to-corner distance. In a regular hexagon that is exactly twice the side, so halve it first.
• Using a hexagon that is not regular, such as a stretched one. Equal sides are required.
• Mixing the unit labels. The output says 'units' even when you measured in centimetres or metres; the area is in that unit squared.
• Doubling the side and expecting double the area. Area grows with the square of the side.