How do you calculate cumulative percent?

Answer 1

Add each new individual percent to the running tally of the percentages that came before it.

For example, if your dataset consisted of the four numbers: 100, 200, 150, 50 then their individual values, expressed as a percent of the total (in this case 500), are 20%, 40%, 30% and 10%.

The cumulative percent would be:

100: 20%

200: 60% (i.e. 20% from the step before + 40%)

150: 90% (i.e. 60% from the step before + 30%)

50: 100% (i.e. 90% from the step before + 10%)