Math
Geometry and formula calculators for the common shapes and classroom staples that people actually reach for.
Percentage calculator
Percentage calculator covers the four percentage jobs people hit most often: finding a portion, reverse-solving the base number, comparing values, and measuring percent change.
Pythagorean theorem
Pythagorean theorem solves the missing side of a right triangle when you know the other two values.
Circle calculator
Circle calculator gives you diameter, circumference, and area from a single radius input.
Regular hexagon calculator
Regular hexagon calculator turns one edge measurement into the standard regular-polygon outputs: perimeter, area, apothem, and circumradius.
Regular pentagon calculator
Regular pentagon calculator turns one edge measurement into the standard regular-polygon outputs: perimeter, area, apothem, and circumradius.
Parallelogram calculator
Parallelogram calculator turns base, side, and height into the standard area and perimeter values.
Rectangle calculator
Rectangle calculator reports area, perimeter, and diagonal from length and width.
Rhombus calculator
Rhombus calculator focuses on the practical pair of side and height so you can get area and perimeter quickly.
Square calculator
Square calculator returns area, perimeter, and diagonal from a single side length.
Equilateral triangle calculator
Equilateral triangle calculator takes one side and returns perimeter, height, and area.
Cone calculator
Cone calculator reports volume, total surface area, and slant height from radius and height.
Cube calculator
Cube calculator turns one edge length into volume, surface area, and space diagonal.
Rectangular cuboid calculator
Rectangular cuboid calculator covers volume, surface area, and space diagonal for box-like solids.
Cylinder calculator
Cylinder calculator gives you volume, lateral area, and total surface area from radius and height.
Dodecahedron calculator
Dodecahedron calculator focuses on the classic edge-length input for surface area and volume.
Icosahedron calculator
Icosahedron calculator turns one edge length into the common regular-solid outputs.
Octahedron calculator
Octahedron calculator reports volume and surface area from a single edge measurement.
Prism calculator
Prism calculator is a generic right-prism helper: feed it base area, base perimeter, and prism height to get volume and surface area.
Hexagonal prism calculator
Hexagonal prism calculator uses side length and prism height to report base area, volume, and surface area.
Pentagonal prism calculator
Pentagonal prism calculator handles regular pentagonal bases and a prism height in one panel.
Triangular prism calculator
Triangular prism calculator assumes a regular triangular base so you can work from side length and prism height quickly.
Hexagonal pyramid calculator
Hexagonal pyramid calculator turns a regular hexagon edge and pyramid height into the usual pyramid outputs.
Pentagonal pyramid calculator
Pentagonal pyramid calculator is the regular-five-sided version of the pyramid helper.
Rectangular pyramid calculator
Rectangular pyramid calculator works from length, width, and height and reports the two slant heights as well.
Square pyramid calculator
Square pyramid calculator gives you slant height, volume, lateral area, and total area from a base edge and height.
Sphere calculator
Sphere calculator converts one radius into diameter, volume, and surface area.
Torus calculator
Torus calculator needs a major radius and a minor radius to return surface area and volume.
Tetrahedron calculator
Tetrahedron calculator turns one regular edge value into height, area, and volume.