Percent Change Calculator
Calculate the percentage change between two values. Shows increase or decrease with colour coding, absolute change and the formula used
How to Calculate Percent Change
Formula: ((New - Original) / Original) × 100. Same formula as percentage increase, but the result can be positive (increase) or negative (decrease). So going from £100 to £150 is +50% change; going from £100 to £80 is -20% change.
Used for any directional comparison: stock price changes, year-on-year growth, weight changes, score improvements, traffic spikes/drops. Financial markets quote daily changes as +/- percentages (FTSE 100 +0.5% today, NASDAQ -1.2%). Use percent change rather than percent increase/decrease when the direction isn't predetermined.
Common Percent Changes
| From | To | Change |
|---|---|---|
| 100 | 120 | +20% |
| 100 | 110 | +10% |
| 100 | 100 | 0% (unchanged) |
| 100 | 90 | -10% |
| 100 | 75 | -25% |
| 50 | 75 | +50% |
| 50 | 25 | -50% |
| FTSE 7500 | FTSE 7575 | +1% |
Frequently Asked Questions
What's the difference between percent change and percentage point change?
Percent change is relative; percentage point is absolute. Going from 5% to 7% is a 2 percentage point change but a 40% percent change ((7-5)/5 × 100). Polls and economic statistics often confuse these - 'unemployment rose 2 points' vs 'unemployment rose 40%' can describe the same data differently.
How do I show negative changes?
Use a minus sign or the word 'decrease': '-15%' or '15% decrease'. Stock and market reports use the minus convention; news articles often use 'decrease' or 'fell by'. Both unambiguous; the minus sign is more compact.
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