Area of a Regular Polygon Calculator
⬛ Area & perimeter (2D). Use the Area of a regular polygon formula to find area, number of sides, side length: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Area | cm² |
| Number of sides | no unit |
| Side length | cm |
Worked example
Find the area when Number of sides = 5, Side length = 5 cm.
Using A = (n s²)/(4 tan(180° / n)): Area = 43.012 cm².
Frequently asked questions
What is the formula for Area of a regular polygon?
A = (n s²)/(4 tan(180° / n)).
What do the letters stand for, and what units are used?
Area in cm², Number of sides, Side length in cm.
How do you calculate area?
Put the values into A = (n s²)/(4 tan(180° / n)). For example, with Number of sides = 5, Side length = 5 cm, area = 43.012 cm².
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (area, number of sides, side length) and fill in the others: it rearranges the formula for you.
