Use this sum of interior angles calculator to calculate sum of interior angles in any polygon by entering the number of sides. Learn the polygon interior angles sum formula easily.
n = number of sides
Subtract 2 from the number of sides and multiply by 180° to find the sum of interior angles.
| n | Sum of Interior Angles |
|---|---|
| 3 | 180° |
| 4 | 360° |
| 5 | 540° |
| 6 | 720° |
| 8 | 1080° |
1. Count the number of sides (n).
2. Subtract 2 from n.
3. Multiply the result by 180° to get the sum of interior angles.
This sum of interior angles calculator automatically computes the sum using the correct polygon interior angles sum formula with up to six decimal places.
• Triangles always sum to 180°.
• Quadrilaterals always sum to 360°.
• As the number of sides increases, the sum of interior angles increases.
• Interior angles help in geometric constructions.
• Regular polygons have equal interior angles.