The image above is a conical frustum.

To compute the volume of a conical frustum, three essential parameters are needed and this parameters are **radius of the lower base (R),** **radius of the upper base (r)** and **height (h).**

The formula for calculating the volume of a conical frustum:

V = ^{πh(R² + Rr + r²)} ⁄ _{3}

Where;

V = Volume of the conical frustum

R = Radius of the lower base

r = Radius of the upper base

h = Height of the conical frustum

Let’s solve an example;

Find the volume of the conical frustum when the lower base is 5 cm with an upper base of 9 cm and a height of 11 cm.

This implies that;

R = Radius of the lower base = 5 cm

r = Radius of the upper base = 9 cm

h = Height of the conical frustum = 11 cm

V = ^{π(11)((5)² + (5)(9) + (9)²)} ⁄ _{3}

V = ^{(34.557)((25) + (45) + (81))} ⁄ _{3}

V = ^{(34.557)(151)} ⁄ _{3}

V = ^{5218.185} ⁄ _{3}

V = 1739.39

Therefore, the **volume of the conical frustum** is **1739.39 cm ^{3}.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the volume of a conical frustum.

To get the answer and workings of the volume of a conical frustum using the **Nickzom Calculator – The Calculator Encyclopedia. **First, you need to obtain the app.

You can get this app via any of these means:

**Web** – https://www.nickzom.org/calculator-plus

To get access to the **professional **version via web, you need to **register** and **subscribe **for** NGN 1,500 **per** annum** to have utter access to all functionalities.

You can also try the **demo **version via https://www.nickzom.org/calculator

**Android (Paid)** – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator

**Android (Free)** – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator

**Apple (Paid)** – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8

Once, you have obtained the calculator encyclopedia app, proceed to the **Calculator Map, **then click on **Mensuration**** **under the **Mathematics** section

Now, click on** Volume of a conical frustum **under **Mensuration**

The screenshot below displays the page or activity to enter your values, to get the answer for the volume of a conical frustum according to the respective parameters which are the **radius of the lower base (R)**, **radius of the upper base (r) **and **height (h).**

Now, enter the values appropriately and accordingly for the parameters as required by the **example** above where the **radius of the lower base (R) **is **5 cm**, **radius of the upper base (r) **is **9 cm **and **height (h) **is **11 cm.**

Finally, Click on Calculate

As you can see from the screenshot above, **Nickzom Calculator** – The Calculator Encyclopedia solves for the volume of a conical frustum and presents the formula, workings and steps too.