Percentage Increase / Decrease Calculator

Calculate percent change (old → new), or reverse it (find the new value from a percent, or find the original).

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Works with negatives too. In “Percent change (Old → New)”, percent change is:
(New − Old) ÷ Old × 100
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Explanation

Measures how much a value increased or decreased compared to the original.

  • Absolute change: Δ = new − old.
  • Percent change: % = (Δ ÷ old) × 100.
  • Reverse: given old and % change, new = old × (1 + %/100).