Percentage Increase Calculator
Calculate percentages in every direction: X% of a number, what percent X is of Y, percentage change, increase and decrease.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the percentage calculator in increase mode: enter a percent and a number, and the tool adds that percent on top, showing the final value and the exact multiplication used — for example 200 + 25% = 200 × 1.25 = 250.
Adding a percentage is how real-world markups work: applying 20% VAT to a net price, granting a 5% raise on a salary, adding a 15% service charge to a bill, or projecting next year's budget at 10% growth. Instead of computing the percent separately and adding it, you can multiply once by (1 + X ÷ 100) — the calculator prints that factor so the shortcut is easy to remember.
Both fields accept decimals, and the result recalculates on every keystroke, entirely inside your browser. If you need the opposite operation — taking a percent off — switch the mode selector to "Decrease" or open the percentage-decrease page.
Example. In percent-of mode, 20 and 80 return 16, because 80 times 0.20 equals 16.
Limit. What-percent mode and percentage-change mode both refuse a reference value of zero.