Calculate area, perimeter, volume, and surface area of shapes
Calculate area, perimeter, volume, and surface area for common 2D and 3D shapes. Select a shape, circle, triangle, rectangle, trapezoid, sphere, cylinder, cone, or prism, enter the dimensions, and get every relevant measurement at once. The tool shows the formulas it uses so you can learn while you calculate.
Initializing in your browser…
You have a right triangle with legs 3 and 4 and need the hypotenuse and area for a layout.
Triangle
right triangle, legs a = 3, b = 4
Results
hypotenuse c = 5 area = 6 perimeter = 12
By the Pythagorean theorem c = √(3²+4²) = 5, and the area of a right triangle is ½·base·height = 6. The tool computes properties for many shapes and shows the formula used, so the result is verifiable, not a black box.
Calculate area, perimeter, volume, and surface area for common 2D and 3D shapes. Select a shape, circle, triangle, rectangle, trapezoid, sphere, cylinder, cone, or prism, enter the dimensions, and get every relevant measurement at once. The tool shows the formulas it uses so you can learn while you calculate.
Compute and verify answers for area, volume, and surface area problems.
Calculate paint coverage, flooring area, or material volume for DIY projects.
Determine material dimensions for custom enclosures, packaging, or parts.
Show students how changing a dimension affects area or volume with instant feedback.
Two-dimensional calculations cover area, perimeter, and related properties like diagonal length for rectangles or arc length for circles. Three-dimensional shapes add volume and surface area. For triangles, the tool accepts side lengths (SSS), two sides and an included angle (SAS), or base and height, automatically applying the appropriate formula. Visual diagrams label each dimension so there is no ambiguity about which measurement goes where.
The tool is unit-agnostic, results are in whatever unit you enter. If you type centimeters, the area comes out in square centimeters.
Not directly. Break the shape into standard shapes, calculate each, and sum the results.
The tool applies Heron's formula when three side lengths are given, computing the semi-perimeter first.
Every calculation runs locally in your browser. Your numbers and expressions are not transmitted or stored.