Geometry calculators

57 calculators

Geometry calculators find area, perimeter, volume, and related measures for plane and solid figures. This hub groups 2D shapes, triangles, circles, angles, and 3D solids so you can open the page that matches the figure you actually have.

Formulas assume the dimensions labeled on the page (radius, side length, and so on). Selected tools include diagrams; every tool shows the identity in How it works. Shape calculators are free to use with no sign-up.

Printable Geometry formula sheet →

2D geometry calculators

Area, perimeter, and plane figures: polygons, ellipses, and related measures.

Triangle calculators

Right, special, and general triangles: area, angles, similarity, and inequalities.

Circle calculators

Radius, circumference, arcs, sectors, and circle equations.

Angle calculators

Complementary, supplementary, clock, central, and vector angles.

3D geometry calculators

Volume and surface of solids: boxes, spheres, cylinders, cones, and more.

Coordinate geometry calculators

Distance and other coordinate measures kept with geometry tools.