Work out what a raise or markup turns a number into, or find the percentage increase behind a change that already happened.
How to Use the Percentage Increase Calculator
"Find New Value" takes an original value and a percentage increase and returns what that value becomes. "Find Percentage" runs it backward — enter the original and new values, and it returns the percentage increase between them; if the second value is actually smaller, a note points to the Percentage Change or Percentage Decrease calculator instead, since this page is built around increases specifically.
Find New Value: new value = original × (1 + percentage ÷ 100)
Find Percentage: percentage = ((new value − original value) ÷ original value) × 100A 15% raise on a $50,000 salary works out to $57,500 — original times 1.15. Run the numbers the other direction, and $50,000 becoming $57,500 confirms back as a 15% increase, the same formula in reverse.
How This Differs From the Percentage Change Calculator
Same arithmetic underneath, different job. The Percentage Change Calculator is built for after-the-fact analysis — two numbers, tell me what happened, with no assumption about direction. This calculator leads with the forward question instead: what does a raise, markup, or increase actually turn a number into, which is the more common way the question shows up when negotiating a salary bump or pricing a markup before it happens. The reverse lookup sits here as the secondary mode, for whenever the direction of the question flips.
Compounding several increases in a row — a 10% raise this year, another 10% next year — doesn't add up to 20%; each pass runs off the new, larger base, the same base-shifts-each-time behavior that makes percentage math slippery no matter which calculator states it.