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Percentage Change Calculator

Calculate the percentage increase or decrease between two values.
See the exact change and direction.

Percentage Change

Percentage change measures how much a value has increased or decreased relative to its original value.

Percentage Change = ((New Value − Old Value) / Old Value) × 100

If the result is:

  • Positive → increase
  • Negative → decrease
  • Zero → no change

Examples:

  • Price went from $50 to $65: ((65 − 50) / 50) × 100 = +30% increase
  • Stock dropped from $120 to $96: ((96 − 120) / 120) × 100 = −20% decrease
  • Population grew from 10,000 to 12,500: +25% increase

Important note: A 50% increase followed by a 50% decrease does NOT return to the original value. $100 → +50% → $150 → −50% → $75.


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