Reverse Percentage Calculator
If you know a part and the percent it represents, find the original whole: whole = part × 100 ÷ percent.
Calculator
Use the Reverse Percentage Calculator
Result
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Formula
whole = part × 100 ÷ percent
Step-by-step
- 1
Enter the part
The portion of the whole you know.
- 2
Enter the percent
What percentage that part represents.
Worked example
Example input: part: 25, percent: 10
Result: 250
Related tools
- Percentage Calculator
Find a percentage of a value.
Frequently asked questions
How do I find the whole from a part?
Multiply the part by 100 and divide by the known share: 25 being 10 percent of the total means the total is 250. That is the example above, and the division works for any pairing. Checks like this are how list prices get recovered.
How do I reverse a tip or service charge?
Same division: a 10 dollar tip that represents 10 percent of the check means the check itself was 100. The tool answers backward whichever share you actually know.
What happens at 0 percent?
No whole exists to recover: saying a part is 0 percent of something states nothing about that something. The calculator reports no result instead of guessing.