Instantly calculate the percentage change between any two numbers. Get a clear result plus a full step-by-step breakdown so you understand exactly how it works.
Percentage increase (or decrease) measures how much a value has changed relative to its starting point. It expresses the change as a fraction of the original, multiplied by 100 to give a percentage.
A positive result means the value went up — an increase. A negative result means it went down — a decrease. Both are calculated with exactly the same formula.
It's used everywhere: salary negotiations, stock returns, price comparisons, sports statistics, and scientific data — making it one of the most practical math skills you can have.
See exactly how much revenue, followers, or performance metrics have grown over any period.
Find out how much more (or less) you're paying for anything — groceries, fuel, or subscriptions.
Work backwards from a target percentage to find what new value you need to hit your goal.
Three simple steps, and you'll have a precise answer with the full workings shown.
Type the starting number — the value before the change. This can be any non-zero number, including decimals and negatives.
Type the ending number — the value after the change. It can be higher or lower than the original.
Hit the button (or press Enter). The result appears in green for an increase or red for a decrease, with a full step-by-step breakdown underneath.
Common real-world scenarios — hover to highlight each row.
| Scenario | Original | New Value | Change | Result |
|---|---|---|---|---|
| Salary raise | $50,000 | $55,000 | ▲ Increase | +10.00% |
| Stock price drop | $240 | $180 | ▼ Decrease | −25.00% |
| Website traffic | 12,000 | 15,600 | ▲ Increase | +30.00% |
| Product price hike | $4.99 | $6.49 | ▲ Increase | +30.06% |
| Weight loss | 185 lbs | 162 lbs | ▼ Decrease | −12.43% |
| Energy bill | $120 | $154.80 | ▲ Increase | +29.00% |
| Test score improvement | 68 | 91 | ▲ Increase | +33.82% |
In-depth guides to help you master percentage calculations for any situation.
A thorough walkthrough of the formula, worked examples, and tips to avoid common errors.
Read articleUnderstand when values go up vs. down, and how the same formula handles both cases.
Read articleFrom finance to fitness, see exactly where percentage change shows up in everyday life.
Read articleThe errors most people make when calculating percentage change — and how to fix them.
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