Beyond the result
How to use the percentage calculator
How to calculate a percentage
Multiply the starting number by the percentage divided by 100. For example, 15% of 200 is 30.
Adding and subtracting a percentage
To increase 200 by 15%, add 30 and get 230. To decrease it by 15%, subtract 30 and get 170.
A percentage of a number versus percentage change
This tool calculates a percentage of a starting amount. To compare an old price with a new price, use our separate Percentage Change calculator.
Check the assumptions. These are educational estimates using the figures you enter. For important decisions, verify the figures against official requirements or your own records.
CHECK YOUR ASSUMPTIONS
Sources & next steps
The calculator uses the numbers you provide and the assumptions explained above. Verify important inputs using your records or independent references.
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