Geometry Calculator
Need the area of a circle, the volume of a cylinder, or the surface area of a sphere? Select a shape, enter its dimensions, and get instant results with formulas shown. Covers rectangles, triangles, circles, trapezoids, cylinders, cones, spheres, and rectangular prisms.
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Select Shape
2D Shapes
3D Shapes
Rectangle
Enter dimensions below
Area
0
w × h
Perimeter
0
2(w + h)
Diagonal
0
√(w² + h²)
How to Use
- Select a shape from the grid (2D or 3D).
- Enter the required dimensions in the input fields.
- The result updates instantly with the formula shown.
- Switch shapes by clicking a different card.
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Frequently Asked Questions
What 2D shapes are supported?
Rectangle, triangle, circle, trapezoid, parallelogram, ellipse, rhombus, and regular pentagon.
What 3D shapes are supported?
Cube, sphere, cylinder, cone, rectangular prism (cuboid), and torus (donut).
Can I calculate the diagonal of a rectangle?
Not directly — but you can use the Pythagorean theorem with the Scientific Calculator.