Percentage · all operations
Find a percent of a number, what percent one value is of another, or the original total from a part and percentage.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
Percent of: a×b/100; what percent: 100a/b; change from a to b: 100(b−a)/|a|
Variables & units
- Operation
- Select an option
- First number / percentage
- Numeric value · minimum -1000000000000, maximum 1000000000000
- Second number / total
- Numeric value · minimum -1000000000000, maximum 1000000000000
Worked example
20% of 250 = 50; 50 is 20% of 250.
Assumptions
For increase/decrease, first is the percentage and second is the original amount. For change, first is original and second is new. Percentage change uses the magnitude of the original as its base.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
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