Regular Heptagon Perimeter Calculator
This regular heptagon perimeter calculator works out the perimeter of a regular heptagon, the seven-sided polygon with all sides equal. Because every side is the same length, the perimeter is simply the side length multiplied by seven, and the calculator returns it instantly along with the area as a bonus. Enter the side length, pick your unit, and read off the result. It is unit agnostic, so a side in metres gives a perimeter in metres and a side in centimetres gives a perimeter in centimetres. The perimeter is the total distance around the outside of the shape, which is useful for fencing, edging, trim, framing and border calculations as well as geometry work. There is nothing to look up and no trigonometry needed for the perimeter itself, since it is just seven equal sides added together. If you also need the area, that is shown beside the perimeter and explained on the matching area page. The formula, a worked example and the assumptions are set out below.
The formula
The perimeter of a regular heptagon is the number of sides times the side length. In symbols, P = n s, where n = 7 and s is the side length. For comparison, the area is (1/4) n s² cot(pi/n).
Worked example
A regular heptagon with a side of 6 has a perimeter of 7 times 6 = 42. Enter 6 above to confirm, and to see the matching area.
Frequently asked questions
How do you find the perimeter of a regular heptagon?
Multiply the side length by seven. Every side of a regular heptagon is the same length, so P = 7 times the side.
Is the perimeter the same as the circumference?
For a polygon we call the distance around the outside the perimeter. Circumference is the same idea but is the word used for a circle.
What if the heptagon is irregular?
Then the sides differ, so add the individual side lengths instead. This calculator assumes a regular heptagon with equal sides.
Who this calculator is for
This calculator is for students, tradespeople and designers who need the perimeter of a regular heptagon for edging, framing or layout.
What this calculator assumes
- The polygon is regular, with seven equal sides.
- You enter the straight side length.
- The perimeter is in the same unit as the side.
- Results are rounded for display.
Formula and sources
Related calculators
- Regular Heptagon Area Calculator: area of the same shape.
- Perimeter Calculator: perimeter of common shapes.
- Circle Calculator: area and circumference of a circle.
- Area Calculator: area of common shapes.