# Conical Frustum Surface Area Calculator

Introducing a geometry calculator for calculating the surface area of conical frustums. Are you looking for a calculator to find the surface area of a conical frustum? The answer is here. Here is an online conical frustum surface area calculator that finds the area of a conical frustum. We also show you the formula for calculating the surface area of conical frustums with example.

## Conical frustum surface area formula

The surface area of a conical frustum can be obtained with the conical frustum surface area formula below:

`A = (π * r`

^{2}) + (π * R^{2}) + {π * (r + R) * √[(R - r)^{2} + h^{2}]}

`r`

: radius of the top surface`R`

: radius of the bottom surface`h`

: height of the conical frustum

## Example of how to calculate the surface area of a conical frustum

We now have the formula to calculate the surface area of a conical frustum. Let’s solve an example problem with that.

For a conical frustum with the top radius r = 3 cm, bottom radius R = 4 cm and the height h = 5 cm, we can calculate its surface area like so:

`A = (π * r`

^{2}) + (π * R^{2}) + {π * (r + R) * √[(R - r)^{2}+ h^{2}]}`A = (π * 3`

^{2}) + (π * 4^{2}) + {π * (3 + 4) * √[(4 - 3)^{2}+ 5^{2}]} = 190.67 cm^{2}

Now you know how to find the surface area of a conical frustum. If you need a handy calculation tool to find the surface area of a conical frustum, try out our conical frustum surface area calculator.

## How to use the conical frustum surface area calculator?

You can use the conical frustum surface area calculator to find the surface area of a conical frustum:

- Enter the length of the top radius (r).
- Enter the length of the bottom radius (R).
- Enter the length of the height (h)
- Our conical frustum calculation tool performs all the calculations for you. The surface area is displayed.