Solve any percentage problem instantly — what is X% of Y, percentage change and more.
Three common percentage problems
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Percentage math comes up constantly in real life — calculating a discount, figuring out a tip, understanding a raise, or comparing price changes — yet many people default to rough mental estimates rather than exact calculations, leading to small but consistent errors.
Percentage change calculations trip people up most often. Going from $50 to $75 is a 50% increase, but going back from $75 to $50 isn't a 50% decrease — it's a 33% decrease. The base number you're calculating "percent of" changes the math, which is a common source of confusion in sales discounts and financial reporting.
Reverse percentage problems (working out the original price from a discounted price) are similarly easy to get wrong without a clear formula — a item marked "30% off, now $70" had an original price of $100, not $91, a mistake that's easy to make mentally.
Use the calculator above for the three most common percentage problems — straightforward, reliable, and faster than mental math when you actually need to be precise.