Percentage Change Calculator
Calculate percentage increase or decrease between two values. Also computes percentage of a number and reverse percentage.
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Results shown are estimates for informational purposes only. Nothing on CalcFlow is financial, tax, legal, or medical advice. Always consult a qualified professional before making important decisions.
What is a Percentage Change? Percentage change measures how much a value has increased or decreased relative to its original value, expressed as a percentage. It is one of the most common calculations in finance, retail, and data analysis.
Rule of Thumb
A positive percentage change is an increase; negative is a decrease. Percentage change from 100 to 200 is +100%, but from 200 to 100 is -50% — the starting value matters.
Example Calculation
A price that rose from $80 to $100 increased by ($100 - $80) / $80 x 100 = 25%. A salary cut from $50,000 to $45,000 is a decrease of ($45,000 - $50,000) / $50,000 x 100 = -10%.
Key Facts
- •Percentage change and percentage point change are different: a rate going from 4% to 6% is a 2 percentage point increase but a 50% relative increase.
- •Percentage change is symmetric only in theory — a 50% drop requires a 100% gain to recover.
- •In finance, a 10% loss followed by a 10% gain does NOT return to the original value.
How to Use
- Select what you want to calculate from the dropdown.
- For Percentage Change: enter the original value and the new value.
- For Percentage OF: enter the total (field 1) and the percentage (field 2).
- For Reverse: enter the result (field 1) and the known percentage (field 2).
- Click Calculate to see the result.
Formula
Percentage Change = ((New - Old) / |Old|) x 100 | X% of Y = (Y x X) / 100 | Reverse: Original = Value / (Percent / 100)| From | To | Percentage Change | Notes |
|---|---|---|---|
| 100 | 110 | +10% | 10% increase |
| 100 | 90 | -10% | 10% decrease |
| 50 | 100 | +100% | Doubled |
| 100 | 50 | -50% | Halved |
| 1000 | 1200 | +20% | Common raise scenario |
| 200 | 150 | -25% | Sale / discount scenario |
| 0.5 | 1.0 | +100% | Decimal values work |