Calculate / Free tool
Calculate a percentage
Calculate a percentage, discount or percentage change. Choose an operation and enter two values.
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How it works
To find p% of a value V, multiply V by p, then divide by 100. Percentage change compares the difference with the starting value. Calculations retain their precision until the result is displayed.
20% of 150 = 150 × 20 ÷ 100 = 30
Does a 20% increase cancel out a 20% decrease?
No. Starting with 100, a 20% increase gives 120, then a 20% decrease gives 96. Each percentage applies to a different base.
Useful next steps
Common ways to use this tool
- Find a percentage of any number, such as 20% of 150.
- Calculate a sale price after a percentage discount.
- Measure the percentage increase or decrease between two values.
Tips for an accurate result
For percentage change, the starting value is the reference. Reversing the two values changes the answer.