UtilityBaseCalculators
Geometry Calculator
Find area, perimeter, surface area, and volume for circles, triangles, cylinders, spheres, and more.
Updated July 10, 2026
How to use the geometry calculator
- 1Choose a 2D shape or 3D solid.
- 2Enter its dimensions.
- 3Read the area/perimeter or surface area/volume.
- 4Check the formula and diagram.
Common uses
- Finding the area of a circle or triangle
- Calculating the volume of a cylinder or sphere
- Geometry homework with formulas shown
- Sizing material for a project
Frequently asked questions
How do I find the area of a circle?
The area of a circle is π times the radius squared: A = πr². For a radius of 5, that's π × 25 ≈ 78.54. Enter the radius and the calculator shows the area, circumference, and diameter with the formula.
What's the formula for the volume of a cylinder?
Volume equals π times the radius squared times the height: V = πr²h. The calculator also gives the surface area, 2πr(r + h), and draws a labeled cylinder.
Does it show the working?
Yes. Each result lists the formula it used, so you can see how the number was derived — helpful for homework and for checking your own math.
About this tool
The geometry calculator computes the key measurements of common 2D shapes and 3D solids. Pick a shape — circle, rectangle, triangle, square, cylinder, sphere, cone, or rectangular prism — enter its dimensions, and it returns the area and perimeter, or the surface area and volume, each with the formula it used and a labeled diagram. It's built for students and anyone who needs the area of a circle or volume of a cylinder quickly. Everything is calculated in your browser.
Like most tools on UtilityBase, the geometry calculator runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more calculators here.
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