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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.
All processing happens directly in your browser. Your files never leave your device and are never uploaded to any server.