Enter the total number of moles of substance and the total volume of substance into the Number Density Calculator. The calculator will evaluate the Number Density. 

Number Density Formula

The following two example problems outline the steps and information needed to calculate the Number Density.

ND = n / V

Variables:

  • ND is the Number Density (moles / volume)
  • n is the total number of moles of substance 
  • V is the total volume of substance 

How to Calculate Number Density?

The following steps outline how to calculate the Number Density.


  1. First, determine the total number of moles of substance. 
  2. Next, determine the total volume of substance. 
  3. Next, gather the formula from above = ND = n / V.
  4. Finally, calculate the Number Density.
  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 of substance = 5,000

total volume of substance = 3

ND = n / V = ?