The image above represents the mill speed. Two essential parameters are needed to calculate mill speed: speed percentage (N%) and critical speed**Â (N _{c}).**

**The formula for calculating mill speed:**

MS = N% x N_{c}

Where:

MS = Mill Speed

N% = Speed Percentage

N_{c}Â = Critical Speed

Let’s solve an example;

Find the mill speed when the speed percentage is 12 and the critical speed is 10.

This implies that;

N% = Speed Percentage = 12

N_{c} = Critical Speed = 10

MS = N% x N_{c}

Then, MS = (^{12}/_{100}) x (10)

MS = (0.12) x (10)

MS = 1.2

Therefore, theÂ **mill speedÂ **isÂ **1.2 m/s.**

**Calculating the Speed Percentage when the Mill Speed and the Critical Speed are Given**

N% = ^{MS} / _{Nc}

Where;

N% = Speed Percentage

MS = Mill Speed

N_{c}Â = Critical Speed

Let’s solve an example;

Find the speed percentage when the mill speed is 24 and the critical speed is 6.

This implies that;

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MS = Mill Speed = 24

N_{c} = Critical Speed = 6

N% = ^{MS} / _{Nc}

So, N% = ^{24} / _{6}

N% = 3

Therefore. theÂ **speed percentageÂ **isÂ **3 m/s.**

Read more:Â How to Calculate and Solve for Critical Mill of Speed | Ball Mill Sizing

**Calculating the Critical Speed when the Mill Speed and the Speed Percentage are Given**

N_{c}Â = ^{MS} / _{N%}

Where;

N_{c}Â = Critical Speed

MS = Mill Speed

N% = Speed Percentage

Let’s solve an example;

Find the critical speed when the mill speed is 30 and the speed percentage is 3.

This implies that;

MS = Mill Speed = 30

N% = Speed Percentage = 3

N_{c}Â = ^{MS} / _{N%}

That is, N_{c}Â = ^{30} / _{3}

N_{c}Â = 10

Therefore, theÂ **critical speedÂ **isÂ **10 m/s.**

Read more:Â How to Calculate and Solve for Shaft Power | Ball Mill Sizing

**How to Calculate Mill Speed With Nickzom Calculator**

Nickzom Calculator â€“Â **The Calculator Encyclopedia** is capable of calculating the mill speed.

To get the answer and workings of the mill speed using the **Nickzom Calculator â€“ The Calculator Encyclopedia.Â **First, you need to obtain the app.

You can get this app via any of these means:

**Web**Â â€“Â https://www.nickzom.org/calculator-plus

To get access to theÂ **professionalÂ **version via web, you need toÂ **register**Â andÂ **subscribeÂ **for**Â NGN 2,000Â **per**Â annum**Â to have utter access to all functionalities.

You can also try theÂ **demoÂ **version viaÂ https://www.nickzom.org/calculator

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

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

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

Once, you have obtained the calculator encyclopedia app, proceed to theÂ **Calculator Map,Â **then click onÂ **Materials and MetallurgicalÂ **underÂ **Engineering****.**

Now, Click onÂ **Ball Mill Sizing****Â **underÂ **Materials and Metallurgical**

Now, Click on **Mill Speed****Â **underÂ **Ball Mill Sizing**

The screenshot below displays the page or activity to enter your values, to get the answer for the mill speed according to the respective parameters which is the **Speed Percentage (N%)** and **Critical Speed (N _{c}).**

Now, enter the value appropriately and accordingly for the parameter as required by the **Speed Percentage (N%)** isÂ **12** and **Critical Speed (N _{c})** is

**10**.

Finally, Click on Calculate

As you can see fromÂ the screenshot above,Â **Nickzom Calculator**â€“ The Calculator Encyclopedia solves for the mill speed and presents the formula, workings and steps too.