Percentage Calculator
Work out a percent of any number, what one number is as a percent of another, and the change between two values — instantly.
Find what y percent of a number is.
Everyday percent math, pre-loaded.
Original vs. new value, scaled to the same bar.
Percentages you hit all the time — a 10%, 20% or 50% slice of common base values.
| Value | 5% | 10% | 15% | 20% | 25% | 50% |
|---|---|---|---|---|---|---|
| 100 | 5 | 10 | 15 | 20 | 25 | 50 |
| 200 | 10 | 20 | 30 | 40 | 50 | 100 |
| 500 | 25 | 50 | 75 | 100 | 125 | 250 |
| 1,000 | 50 | 100 | 150 | 200 | 250 | 500 |
| 2,500 | 125 | 250 | 375 | 500 | 625 | 1,250 |
Pctzen handles the percentage calculations you run into daily — finding a percent of a number, measuring percent change between two values, or working backward from a result. It's built for shoppers comparing discounts, analysts checking growth rates, students verifying homework, and anyone who needs a reliable answer faster than opening a spreadsheet. Every calculation runs locally in your browser, so there's nothing to install and no data leaves your device. Type your values, read the result, move on.
Multiply the number by the percentage and divide by 100. For example, 15% of 80 is 80 × 15 ÷ 100 = 12.
Subtract the old value from the new one, divide the result by the old value, then multiply by 100.
Yes. Discount and tip modes apply the percentage straight to a price and show the amount saved or added.
It is free, requires no account, and each calculation runs in your browser.
