Percentage change calculator
Measure the percentage increase or decrease between two non-negative values.
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Percentage calculator
Find a percentage of a number, plus totals after adding or subtracting it.
Your result
A little input. A useful result.
Adjust the example inputs, then select Calculate percentage.
About this tool
Turn a percentage and a base number into an amount. You also get the totals after increasing or decreasing the base by that percentage, so you can compare all three results at once.
How to use it
- 1
Enter the base number you are starting with.
- 2
Enter the percentage, such as 15 for 15%.
- 3
Calculate the portion and the increased and decreased totals.
Questions, answered
How is the percentage amount calculated?
The amount is the base number multiplied by the percentage divided by 100. For example, 15% of 200 is 200 × 15 ÷ 100 = 30.
Can I use decimal or negative percentages?
Yes. Decimals such as 2.5 are accepted. A negative percentage produces a negative portion, so adding it reduces the base.