Quick percentage calculator
The three most common percentage questions. Results update as you type.
Need discounts, tips, reverse percentages or step-by-step working? Pick a dedicated calculator below.
Each calculator below has its own dedicated page with a full guide, worked examples, and FAQs — pick the one you need. All calculations run 100% in your browser: nothing you enter is ever sent to a server.
All Percentage Tools
How Do You Calculate a Percentage?
To find a percentage of a number, divide the percentage by 100 and multiply: 15% of 200 = 0.15 × 200 = 30. To find what percent one number is of another, divide the part by the whole and multiply by 100: 432 out of 500 = 86.4%. Use the quick calculator above for any of these in one step.
Percentage Formulas
| Question | Formula | Example |
|---|---|---|
| What is X% of Y? | X ÷ 100 × Y | 15% of 200 = 30 |
| X is what % of Y? | X ÷ Y × 100 | 30 of 200 = 15% |
| Percentage change | (new − old) ÷ old × 100 | 50,000 → 55,000 = +10% |
| Original before a % change | result ÷ (1 ± % ÷ 100) | $120 after +20% = $100 |
How to Calculate Percentage of Marks
Divide the marks you got by the total marks and multiply by 100. If you scored 432 out of 500: 432 ÷ 500 × 100 = 86.4%. For several subjects, add all obtained marks and all total marks first, then divide; don't average the percentages if subjects have different totals.
Quick Answers
| of 50 | of 200 | of 1,000 | of 5,000 | |
|---|---|---|---|---|
| 5% | 2.5 | 10 | 50 | 250 |
| 10% | 5 | 20 | 100 | 500 |
| 15% | 7.5 | 30 | 150 | 750 |
| 20% | 10 | 40 | 200 | 1,000 |
| 25% | 12.5 | 50 | 250 | 1,250 |
Percentage vs Percentage Points
A rate rising from 4% to 6% has gone up 2 percentage points, which is a 50% increase relative to where it started. News reports on interest rates and elections usually mean percentage points.
Which Percentage Calculator Do I Need?
- Percentage of a number calculator: X% of Y, or what percent X is of Y.
- Percentage change calculator: the change or difference between two values.
- Percentage increase calculator: raises, price rises and growth.
- Discount calculator: sale prices, including stacked discounts.
- Reverse percentage calculator: the original price before a discount or tax.
- Markup vs margin and the tip calculator for business and bills.
Who Uses the Percentage Calculator?
- Shopping: work out a discount, a tip or the tax on a price.
- School and work: turn marks into a percentage or find a share of a total.
- Money: see how much a rent or salary rise is in percentage terms.
How the Percentage Calculator Saves You Time
Each kind of percentage question needs a slightly different formula. This calculator has them side by side, so you type two numbers and read the answer.
Frequently Asked Questions
What is the formula for percentage?
How do I calculate percentage of marks?
How do I calculate a percentage on a calculator?
What is the difference between percentage change and percentage difference?
What is the difference between a percentage increase and a percentage point change?
How do I find the original price before a discount?
Last updated: September 2026