Geometry Calculator
Area, perimeter and volume of common shapes.
Area
- Circumference
- 31.415927
- Diameter
- 10
Results use the same unit as your inputs: squared for area, cubed for volume.
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How this calculator works
Choose a shape and enter its dimensions. Only the dimensions listed for that shape are used.
Formula
Circle: A = πr²; Sphere: V = 4/3·πr³; Cylinder: V = πr²h
Example
A circle with radius 5 has an area of about 78.54 and a circumference of about 31.42.
When to use it
- Flooring, paint and material estimates
- Tank and container volumes
- Geometry homework
Frequently asked questions
What units should I use?
Any unit works as long as every dimension uses the same one. Areas come out in square units and volumes in cubic units.
How do I find the area of an irregular room?
Split it into rectangles, calculate each area and add them together.