Geometry Calculators

Find area, volume, perimeter and surface area for the shapes you actually meet — in homework, exams, or a job that needs a quick number. Two-dimensional calculators cover squares, rectangles, triangles, circles, ellipses, parallelograms, trapezoids, rhombuses, pentagons, hexagons, octagons, circle sectors, ring shapes, kites and regular polygons, giving area and perimeter from the measurements you type in. Three-dimensional calculators cover cubes, cuboids, spheres, hemispheres, cylinders, cones, pyramids, triangular prisms, toruses, frustums and ellipsoids, giving volume and surface area. Each calculator shows the formula it uses and the working behind the answer, so it works as a study aid as well as a calculator — students can check homework and see exactly how the answer was reached, and teachers can use the steps to explain a concept. Builders and makers use the volume tools for concrete, tanks and storage, and the area tools for flooring, paint and materials. Everything runs in your browser with no sign-up and no cost, and the calculators work offline once the page has loaded, which makes them handy in a classroom or on a job site with no signal.