About This Tool
The Geometry Calculator computes area, perimeter and volume for a range of common 2D and 3D shapes including rectangles, triangles, circles, cylinders and more.
Frequently Asked Questions
What shapes are supported?
Rectangle, Square, Triangle, Circle, Cylinder, and Sphere.
What units does the calculator use?
The calculator is unit-agnostic — results are in whatever unit you enter (e.g. cm → cm², cm³).
How is the triangle area calculated?
This tool uses the base × height / 2 formula. For triangles defined by three sides only, use our dedicated Triangle Calculator.