How to Calculate and Solve for Loss on Ignition | Refractories

Last Updated on May 27, 2024

The loss on ignition is illustrated by the image below. Two essential parameters are needed to calculate the loss on ignition: weight before firing (m1) and weight after firing (m2).

The formula to calculate loss on ignition:

LOI = 100((m1 – m2)/m1)


LOI = Loss On Ignition
m1 = Weight before Firing
m2 = Weight after Firing

Let’s solve an example;
Find the loss on ignition when the weight before firing is 22 and the weight after firing is 11.

This implies that;

m1 = Weight before Firing = 22
m2 = Weight after Firing = 11

LOI = 100((m1 – m2)/m1)
LOI = 100((22 – 11)/22)
So, LOI = 100(11/22)
LOI = 100(0.5)
LOI = 50

Therefore, the loss on ignition is 50%.

Read more: How to Calculate and Solve for Permeability Number | Refractories

How to Calculate Loss on Ignition With Nickzom Calculator

Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the loss on ignition.

To get the answer and workings of the loss on ignition 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 –

To get access to the professional version via web, you need to register and subscribe to have utter access to all functionalities.
You can also try the demo version via

Android (Paid) –
Android (Free) –

Apple (Paid) –
Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Materials and Metallurgical under Engineering.

Now, Click on Refractories under Materials and Metallurgical

Now, Click on Loss on Ignition under Refractories

The screenshot below displays the page or activity to enter your values, to get the answer for the loss on ignition according to the respective parameter which is the Weight before Firing (m1) and Weight after Firing (m2).

Now, enter the values appropriately and accordingly for the parameters as required by the Weight before Firing (m1is 22 and Weight after Firing (m2) is 11.

Finally, Click on Calculate

As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the loss on ignition and presents the formula, workings and steps too.

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