Cone Volume Calculator

Calculate the volume of a cone or conical frustum using the cone volume calculator below.

Diagram of a cone showing r = radius and h = height
Diagram of a frustum showing R = base radius, r = top radius, and h = height

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How to Calculate the Volume of a Cone

A cone is a three-dimensional object with a rounded base and curved sides that extend to a point or vertex. You can calculate the volume of a cone given the dimensions of its base and the height of its vertex.

Cone Volume Formula

You can use the following formula to find the volume of a cone:

V = 1 / 3πr²h

Thus, the volume of a cone is equal to 1/3 times pi times the length of the base radius r squared, times the height of the vertex h.

To calculate a cone’s volume, you need the height and radius, then apply the formula above.

Graphic showing the formula to calculate the volume of a cone.

For example, let’s calculate the volume of a cone with a radius of 7 and a height of 22.

V = 1 / 3 × π × 7² × 22
V = 1128.9

So, the volume of this cone is 1128.9.

How to Calculate the Volume of a Conical Frustum

A frustum is a three-dimensional object with a rounded base and a smaller rounded top, with a rounded side connecting the two planes. A frustum is essentially a horizontal slice of a cone.

Diagram of a frustum showing R = base radius, r = top radius, and h = height

You can calculate the volume of a frustum given the dimensions of its top and base, and the height of the top from the base.

Cone Volume Formula

You can use the following formula to find the volume of a frustum:

V = 1 / 3 × π × h × (R² + r² + (R × r))

Thus, the volume of a frustum is equal to 1/3 times pi times the height of the top from the base h, times the base radius R squared plus the top radius r squared, plus the product of the top and base radii.