17+ Average Mass Calculator. The average atomic mass calculator calculates the average atomic mass based on the isotopic masses relative to their natural abundance in a sample substance. The average mass ((am)) of a group of objects is calculated using the formula:

For a given element, it is the quickest and easy way to find the combined mass of proton, electron,. Average mass (am) is the mean mass of a set of objects. It is calculated by summing the masses of all objects and then dividing by the number of objects.







