Enter an old value and a new value to find the exact percentage increase or decrease between them, plus the absolute difference. Perfect for prices, scores and metrics.
Change % = (new − old) ÷ old × 100. A rise gives a positive percent, a fall a negative one. The calculator also shows the absolute difference.
"Up 200%" and "up 2×" sound different but mean the same; expressing both as a percent removes the ambiguity when comparing metrics like revenue, weight or price.
Dividing by the new value instead of the old. That flips the base and gives the wrong percent whenever old ≠ new.
What if the old value is zero? Percent change from zero is undefined; report the absolute increase instead.
Negative percent means what? A drop — the new value is below the old one by that share.