Percentage Calculator
Most percentage questions are one of three shapes.
Notes
- Percentage change is not symmetric. Going from 100 to 120 is +20%, but 120 back to 100 is -16.6667%.
- Change from zero is undefined and is reported as an error rather than as infinity.
Common questions
- What is the difference between percentage points and percent?
- A rate moving from 5% to 7% is a rise of 2 percentage points, but a 40% increase. Both are correct — they answer different questions.
- How do I remove a percentage that has already been added?
- Divide rather than subtract. To strip 8% tax from $108, divide by 1.08 to get $100. Subtracting 8% would leave $99.36.