Polygon Area Calculator - Online Irregular Shape Tool
Calculate the area of an irregular polygon by entering its vertex coordinates. Uses the shoelace formula. Pure math.
UD5 Toolkit
Calculate the area of an irregular polygon by entering its vertex coordinates. Uses the shoelace formula. Pure math.
Find the centroid (center of mass) of any convex polygon by entering vertex coordinates. Useful for physics and design.
Enter a number of sides (3‑100) and get the correct polygon name (triangle, hectogon). Fun geometry reference.