The image above represents grain size determination. To calculate average number of grains per square inch, one essential parameter is needed and this parameter is **ASTM Grain Number (n).**

**The formula for calculating average number of grains per square inch:**

N_{o}Â = 2^{(n – 1)}

Where:

N_{o}Â = Average Number of Grains per Square Inch

n = ASTM Grain Number

Given an example;

Find the average number of grains per square inch when the ASTM grain number is 2.

This implies that;

n = ASTM Grain Number = 2

N_{o}Â = 2^{(n – 1)}

That is, N_{o}Â = 2^{(2 – 1)}

N_{o}Â = 2^{(1)}

N_{o} = 2

Therefore, theÂ **average number of grains per square inchÂ **isÂ **2.**

Read more:Â How to Calculate and Solve for Grain Size Number with Magnification | Imperfection in Solids

**How to Calculate Grain Size Determination: Relationship between ASTM number and Grain Size per Square Inch | Nickzom Calculator**

Nickzom Calculator â€“ The Calculator Encyclopedia is capable of calculating the average number of grains per square inch.

To get the answer and workings of the average number of grains per square inch using the Nickzom Calculator â€“ The Calculator Encyclopedia. First, you need to obtain the app.

You can get this app via any of these means:

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

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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

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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 **Imperfection in Solids**Â underÂ **Materials and Metallurgical**

Now, Click on **Average Number of Grains per Square Inch**Â underÂ **Imperfection in Solids**

The screenshot below displays the page or activity to enter your value, to get the answer for the average number of grains per square inch according to the respective parameter which is the **ASTM Grain Number (n).**

Now, enter the values appropriately and accordingly for the parameter as required by the **ASTM Grain Number (n)** is **2**.

Finally, Click on Calculate

As you can see from the screenshot above, Nickzom Calculatorâ€“ The Calculator Encyclopedia solves for the average number of grains per square inch and presents the formula, workings and steps too.