**Instructions:**

- Enter the top radius (r1), bottom radius (r2), and height (h) of the conical frustum.
- Select the unit of measurement from the dropdown.
- Click "Calculate" to calculate the volume and surface area of the frustum.
- Results will be displayed below along with detailed calculations.
- Use the "Clear" button to reset the inputs and results.
- Click "Copy" to copy the results to the clipboard.

**Results:**

**Detailed Calculation:**

**Calculation History:**

**Concepts**

A conical frustum is a portion of a cone that is formed by cutting off the top or bottom of the cone with a plane parallel to the base. The frustum has two circular bases, one at the top and one at the bottom, and a lateral surface that is a frustum of a cone.

**Formulae**

The following formulae can be used to calculate the volume, surface area, and lateral surface area of a conical frustum:

**Volume:**The volume of a conical frustum is calculated using the following formula:

```
V = (1/3) * πh * (r1^2 + r2^2 + r1r2)
```

where:

- V is the volume of the frustum
- π is the mathematical constant pi, approximately equal to 3.14159
- h is the height of the frustum
- r1 is the radius of the top base of the frustum
- r2 is the radius of the bottom base of the frustum

For example, the volume of a conical frustum with a height of 5 feet, a top base radius of 3 feet, and a bottom base radius of 4 feet is:

```
V = (1/3) * π * 5 feet * (3 feet^2 + 4 feet^2 + 3 feet * 4 feet) = 37.99 square feet
```

**Surface area:**The surface area of a conical frustum is calculated using the following formula:

```
A = π(r1^2 + r2^2 + (r1 + r2) * s)
```

where:

- A is the surface area of the frustum
- π is the mathematical constant pi, approximately equal to 3.14159
- r1 is the radius of the top base of the frustum
- r2 is the radius of the bottom base of the frustum
- s is the slant height of the frustum

The slant height of a conical frustum is the distance from the apex of the frustum to any point on the circumference of the top or bottom base. To calculate the slant height of a conical frustum, you can use the following formula:

```
s = √((r1 - r2)^2 + h^2)
```

For example, the surface area of a conical frustum with a height of 5 feet, a top base radius of 3 feet, and a bottom base radius of 4 feet is:

A = π(3 feet^2 + 4 feet^2 + (3 feet + 4 feet) * √((3 feet – 4 feet)^2 + 5 feet^2)) = 62.83 square feet

**Lateral surface area:**The lateral surface area of a conical frustum is calculated using the following formula:

```
L = π(r1 + r2) * s
```

where:

- L is the lateral surface area of the frustum
- π is the mathematical constant pi, approximately equal to 3.14159
- r1 is the radius of the top base of the frustum
- r2 is the radius of the bottom base of the frustum
- s is the slant height of the frustum

For example, the lateral surface area of a conical frustum with a height of 5 feet, a top base radius of 3 feet, and a bottom base radius of 4 feet is:

```
L = π(3 feet + 4 feet) * √((3 feet - 4 feet)^2 + 5 feet^2) = 49.45 square feet
```

## Benefits

There are a number of benefits to using a conical frustum calculator:

**Accuracy:**Conical frustum calculators are very accurate. They can calculate the volume, surface area, and lateral surface area of a conical frustum with a high degree of precision.**Convenience:**Conical frustum calculators are very convenient to use. They are available online and can be used anywhere with an internet connection.**Speed:**Conical frustum calculators can perform calculations very quickly. This can be helpful for students, engineers, and other professionals who need to calculate the volume, surface area, and lateral surface area of a conical frustum regularly.

## Interesting facts

Here are some interesting facts about conical frustums:

- Conical frustums are used in a variety of applications, including:
- Funnels Loudspeakers Musical instruments Rockets Tanks
- The Great Pyramid of Giza is believed to have been built using conical frustums.
- The conical frustum is the strongest geometric shape in compression.