Percentage calculator
Find a percent of a number, percent change, or share of a total. Results update instantly — no account needed.
How to use the percentage calculator
1. Choose a mode: percent of a number, percent change, or what percent.
2. Enter the values (you can use a comma or a dot as the decimal separator).
3. Read the result — it recalculates automatically after each change.
4. Copy the result manually or try another example by switching modes.
Calculation examples
Percent of a number
You want to know what 23% of 890 is. In “percent of a number” mode, enter 23 and 890. Result: 204.70. Handy for tax, fees, and commission estimates.
Percent change
A price rose from 40 to 52. In percent-change mode, enter 40, then 52. Result: +30%. If it fell from 52 to 40, the result will be negative.
Share as a percent
45 out of 200 people voted. In “what percent” mode, enter 45 and 200. Result: 22.5%. Ideal for turnout, budget share, or project progress.
When to use this tool
• When you calculate discounts, VAT, commissions, or margins.
• When you compare price, salary, or traffic growth or decline.
• When you need a quick answer without opening a spreadsheet.
The formula and the intuition
A percent is simply a hundredth of a whole. When you say “15%”, you mean 15/100 = 0.15. So “15% of 200” is 200 × 0.15 = 30. The same rule applies to tax, discounts, and fees.
Frequently asked questions
How do I calculate a percent of a number?
Multiply the number by the percent and divide by 100. Example: 20% of 150 is 150 × 20 ÷ 100 = 30.
How do I calculate percent change?
Subtract the starting value from the ending value, divide by the starting value, and multiply by 100. A positive result means growth; a negative one means decline.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. Example: 25 of 200 is (25 ÷ 200) × 100 = 12.5%.
What is the difference between “percent of a number” and “percent change”?
“Percent of a number” answers “how much is X% of Y”. Percent change tells you how much a value rose or fell relative to where it started.
Can I enter fractions and decimals?
Yes. We accept both a dot and a comma as the decimal separator, e.g. 12.5 or 12,5.