Percentage Calculator

This calculator's percent-change mode takes your original and new value, finds the difference, and divides it by the original value to show you the exact percentage the number went up or down — useful for tracking things like salary raises, price changes, or year-over-year growth. If neither value is really the "original" and you just want to compare the two, use the Percentage Difference mode instead, which treats both values the same way.

Yes — switch to the "X% of Y" mode, enter the discount percentage and the original price, and the tool instantly shows you the exact amount you'd save. Subtract that number from the price to get your final total, which makes it handy for comparing deals while shopping online or in store.

"Percent of" answers questions like "what is 15% of 80," "X is what % of Y" tells you what percentage one number represents of another, "X is Y% of what" works backwards to find the original total, "percentage difference" compares two values symmetrically (A vs B gives the same result as B vs A), and "percent change" measures a directional move from one specific starting value — five different calculations, so this tool keeps them as five separate modes rather than mixing them into one confusing form.

No. Every calculation runs locally in your browser, so the numbers you enter — whether that's a salary, a grade, or a purchase price — are never transmitted to or stored on our servers.

No signup, account, or payment is required — this tool is free to use as often as you like, directly in your browser, on desktop or mobile.

This tool is built for common real-life math, not just classroom problems. Use it to split a bill fairly among friends, check how much you're really saving on a sale price, work out an exam or test score, or handle everyday business calculations — all without remembering a single formula or opening a spreadsheet.

Yes — use the '% of Number' mode with your bill total and the tip or tax percentage (like 18% or 20%) to get the exact amount to add, the same math a dedicated tip calculator uses.

A percentage point is the plain arithmetic difference between two percentages (going from 40% to 45% is a rise of 5 percentage points), while a percentage change describes that same move relative to the starting value (a 5-point rise from 40% is actually a 12.5% increase). Use the "% Change" mode here when you want the true relative percentage change, not just the point difference.

Yes. The "% Change" mode automatically detects whether the new value is higher or lower than the original and labels the result "increase" or "decrease" with the correct plus or minus sign, so you can use the same mode to check a pay cut, a price drop, or a declining metric just as easily as a gain.