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Geometry Calculators

Cone Calculator

Volume, slant height and surface area of a right circular cone from its radius and height.

Enter values

Results update as you type.

Result

Volume

75.398224

Slant height
8.544004
Lateral area
80.525338
Total surface area
108.799672

About the Cone Calculator

Volume, slant height and surface area of a right circular cone from its radius and height.

Also known as: cone volume, volume of a cone, slant height, surface area of cone.

How to use this calculator

  1. Enter radius, height.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

V = ⅓πr²h · l = √(r² + h²) · A = πr(r + l)

Worked example

Using the values pre-filled in the calculator above:

  • Radius = 3
  • Height = 8

the calculator returns:

  • Volume: 75.398224
  • Slant height: 8.544004
  • Lateral area: 80.525338
  • Total surface area: 108.799672