How Does It Work?
- Pick the question you needThe page covers the three percentage questions people actually ask: a percentage of a number, a share expressed as a percentage, and a change between two values.
- Type your numbersEvery field accepts decimals and negative values. Results recalculate as you type, so there is no button to hunt for.
- Read or copy the answerEach block shows the result plus the working underneath, so you can check it or paste it into an email.
What Is It Used For?
Percentages sit behind most everyday number questions: a tip, a sale price, a tax line, a grade, a growth figure in a report. This calculator keeps all three common forms on one screen so you never have to remember which way round the division goes.
- Working out a discount, a tip or a commission on a price.
- Turning a score into a percentage — 45 correct answers out of 180 questions.
- Measuring growth or decline between two figures, such as last month against this month.
- Checking an invoice line, a payslip deduction or a bank fee.
- Homework and exam practice where you need to see the working, not just the answer.
Examples
| Question | Working | Answer |
|---|---|---|
| 20% of 250 | 250 × 0.20 | 50 |
| 15% of 89.90 | 89.90 × 0.15 | 13.49 |
| 45 out of 180 | 45 ÷ 180 × 100 | 25% |
| 120 → 150 | (150 − 120) ÷ 120 × 100 | +25% |
| 80 → 60 | (60 − 80) ÷ 80 × 100 | −25% |