Geometry Calculators

Measure the world with precision. These geometry calculators compute area, perimeter, volume, and surface area for every common 2D and 3D shape — squares, cubes, circles, spheres, cylinders, cones, pyramids, and regular polygons. You'll also find the distance and slope between points, the Pythagorean theorem solver, and a square-footage tool for flooring, paint, and real-estate math. Enter any known measurement and get every related property instantly.

  • Area

    Calculate the area of common 2D shapes.

  • Circle

    Calculate all properties of a circle from any one measurement.

  • Cube

    Find the volume, surface area, face diagonal, and space diagonal of a cube. Enter any one value you know and get all the others instantly.

  • Distance

    Calculate the distance between two points in 2D or 3D space.

  • Perimeter

    Calculate the perimeter (total boundary length) of common 2D shapes.

  • Regular Polygon

    Calculate area, perimeter, and properties of regular polygons.

  • Pythagorean Theorem

    Find the missing side of a right triangle. Enter any two sides to find the third.

  • Slope & Line Equation

    Find the slope and equation of a line from two points.

  • Square

    Find the side length, area, perimeter, and diagonal of a square. Enter any one value you know and get the other three instantly.

  • Square Footage

    Measure rooms in feet, meters, or inches. Add as many rooms as you need, see a running total, and get conversions plus material estimates.

  • Surface Area

    Calculate the surface area of common 3D shapes.

  • Volume

    Calculate the volume of common 3D shapes.