Percentage Increase vs Percentage Change Calculator
Percentage increase and percentage change are easy to confuse because the names sound alike and the arithmetic is related, but they answer different questions. Percentage increase is forward-looking: you have an original value and a known percentage, and you want the added amount and the new value. Percentage change is backward-looking: you have an old value and a new value, and you want to know what percent the movement represents. The percentage increase article makes the distinction directly: it is for forward calculations, not for discovering the percent change between two already known values.
Both calculators share the same base-100 notation and the same respect for baselines — the percent you get depends on what you compare against. Neither is the same as percent off, and neither handles the symmetric case where neither value is the baseline.
What each calculator does
The percentage increase calculator takes an original value and an increase percentage. It multiplies the original by the percentage divided by 100 to find the added amount, then adds that amount to find the new value, in the same unit as the start. It restricts both inputs to nonnegative numbers so the result is always an increase or no change, and it is the right framing for raises, markups, price hikes, population estimates, and budget increases when the percent is already known.
The percentage change calculator takes an original value and a new value. It subtracts the original from the new value for the signed change, divides by the original value, and multiplies by 100. Positive results are increases, negative results are shown as labeled decreases, and zero is labeled No change. The original value cannot be zero because division by zero is undefined, and the page points to percentage difference when neither value is the baseline.
Side-by-side comparison
| Feature | Percentage increase calculator | Percentage change calculator |
|---|---|---|
| Inputs | Original value, increase percentage | Original value, new value |
| Outputs | Increase amount, new value | Signed percent change, absolute change |
| Direction | Forward: known percent applied | Backward: percent solved between values |
| Sign handling | Nonnegative only — increase or no change | Positive or negative, labeled increase/decrease |
| Zero baseline | Not applicable | Invalid (division by zero) |
| Typical uses | Raise, markup, price hike, fee | Before-and-after price, revenue, score metrics |
When to use which
Use the percentage increase calculator when the percentage is the known quantity: “my salary goes up 5%,” “this item is marked up 20%,” or “the budget increases 10%.” It returns both the added amount and the new value, which is what you need for planning a number forward.
Use the percentage change calculator when you have two actual measurements — last month’s revenue and this month’s, yesterday’s price and today’s, a score before and after — and you want the percent movement. It handles decreases directly, which the increase page cannot. And when you compare two values with no clear baseline, neither page is the right one: use the percentage difference calculator instead. Whichever tool you pick, remember the baseline rule — the percent you see depends entirely on the starting value it is measured against.
Where to start
- Percentage increase calculator — apply a known percentage to an original value and see the added amount and new value.
- Percentage change calculator — find the signed percent change between an old value and a new value, increases and decreases included.