Overview
What Is a Polygon Calculator?
This tool calculates the interior angle sum, each interior angle, and area of a regular polygon based on the number of sides and side length.
Calculate interior angles and area of regular polygons.
This tool calculates the interior angle sum, each interior angle, and area of a regular polygon based on the number of sides and side length.
Useful for coursework involving regular polygons and their properties.
Input how many sides the polygon has.
Input the length of each equal side.
Interior angles and area update automatically.
(n-2) × 180°, where n is the number of sides.
((n-2) × 180°) ÷ n, for a regular polygon.
(n × s²) ÷ (4 × tan(π/n)), where n is sides and s is side length.
No, this assumes a regular polygon with equal sides and angles - irregular polygons need different calculation methods.
3, forming a triangle - polygons need at least 3 sides.
No, calculations happen entirely in your browser.
As sides increase, each interior angle approaches (but never reaches) 180°, making the shape increasingly circle-like.
Yes, decimal measurements are fully supported.
Yes, regular polygon calculations are used in various design and construction contexts.
Yes, completely free with no sign-up required.