Enter the total number of moles and the total mass (grams) into the Calculator. The calculator will evaluate the Moles Per Gram. 

Moles Per Gram Formula

m:g = m/w


  • m:g is the Moles Per Gram (moles/gram)
  • m is the total number of moles
  • w is the total mass (grams)

To calculate Moles Per Gram, divide the number of moles by the mass in grams.

How to Calculate Moles Per Gram?

The following steps outline how to calculate the Moles Per Gram.

  1. First, determine the total number of moles. 
  2. Next, determine the total weight (grams). 
  3. Next, gather the formula from above = m:g = m/w.
  4. Finally, calculate the Moles Per Gram.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total number of moles = 30

total weight (grams) = 50


What is a mole in chemistry?

A mole is a unit of measurement used in chemistry to express amounts of a chemical substance, defined as the amount of any substance that contains as many elementary entities (e.g., atoms, molecules, ions, electrons) as there are atoms in 12 grams of pure carbon-12 (12C), the isotope of carbon with relative atomic mass 12 by definition. This number is known as Avogadro’s number, approximately 6.022 x 1023.

Why is the concept of moles per gram important?

Moles per gram is a critical concept in chemistry as it allows scientists to convert between the mass of a substance and the number of moles of that substance. This conversion is essential for stoichiometry calculations, which are used to predict the outcomes of chemical reactions in terms of the amounts of reactants and products involved.

Can the moles per gram value change for a substance?

Yes, the moles per gram value of a substance can change depending on its molecular weight. The molecular weight (or molar mass) of a substance affects how many moles of the substance there are in a given mass. Therefore, substances with higher molecular weights will have fewer moles per gram compared to substances with lower molecular weights.

How does temperature affect the calculation of moles per gram?

Generally, the calculation of moles per gram itself is not directly affected by temperature because it is a ratio of moles to mass (grams). However, the mass of a gas can be influenced by temperature (as well as pressure) due to changes in density. For substances in solid or liquid states, temperature changes are less likely to affect their mass significantly for the purpose of calculating moles per gram.