Find percentages, percentage change, and reverse values.
The three fields work independently depending on what you're solving for. Fill in Value and Total to get a percentage share — for example, entering 50 and 200 shows that 50 is 25% of 200. Fill in Value and New value instead to get a percentage change — entering 200 and 260 shows a 30% increase. You don't need to fill in every field for every calculation; use whichever pair matches your question.
These two terms get mixed up constantly, and the mix-up changes the actual meaning of a number. If a savings account's interest rate rises from 2% to 3%, that's a change of 1 percentage point — but expressed as a percentage change, it's actually a 50% increase, since 1 is half of 2. News articles and product descriptions often say "percent" when they mean "percentage points," which can make a modest change sound far bigger, or a big relative change sound small. When you see a rate described in "percent," check whether the source means the raw point difference or the relative change — this calculator's New value field always gives you the relative percentage change.
A common assumption is that a percentage increase and an equal percentage decrease cancel out. They don't, because each percentage applies to a different base value. Start with €100: a 20% increase brings it to €120. Apply a 20% decrease to that new €120, and you get €96 — not the original €100. The decrease is calculated on the larger number, so it removes more in absolute terms than the increase added. This matters for anything applied in sequence, such as stacked discounts, salary changes, or investment gains and losses.
Use this calculator for sale prices, margin changes, budget comparisons, test scores, and month-over-month changes. It is designed for fast everyday calculations without spreadsheet setup.
Enter the original value in "Value" and the new value in "New value." The calculator compares the two and returns the percentage change — positive for an increase, negative for a decrease.
A rate moving from 2% to 3% is a change of 1 percentage point, but a 50% percentage change, since 1 is half of 2. Percentage points describe the raw difference; percentage change describes it relative to the starting value — and they can tell very different stories about the same numbers.
No. The decrease is calculated on the new, larger amount, so it removes more than the increase added. €100 up 20% is €120; €120 down 20% is €96, not €100.
Percentage share compares one value to a total (Value ÷ Total). Percentage change compares how much a value moved relative to its own starting point (Value → New value).