Percentage Change Calculator
Calculate the growth or decline between two values. Perfect for stocks, real estate, and business performance.
Percentage Change
+50.00%
Difference
$50
Direction
Increase
Times Multiplier
1.5x
Growth Analysis
The value has grown by exactly 50% of the original amount.
The Percentage Change Formula
((New Value - Old Value) / |Old Value|) × 100
To find the change, subtract the old from the new, divide by the old, and multiply by 100. A positive result is an increase, while a negative result is a decrease.
When to Use This Tool
Investing
Determine the Return on Investment (ROI). If you bought a stock at $200 and it's now $240, you've experienced a 20% gain.
Retail Markdowns
Check the real discount percentage. If a price drops from $150 to $120, the percentage change calculator shows you a 20% discount.
Salary Growth
Evaluate your raise. Moving from a salary of $60,000 to $66,000 represents a 10% increase in your annual compensation.
Percentage Change FAQ
1. Can percentage change be negative?
Yes. A negative percentage change indicates a decrease from the original value.
2. Why does a 50% drop require a 100% gain to recover?
If $100 drops by 50%, you have $50. To get back to $100, you must add $50. Since $50 is 100% of your current $50 balance, you need a 100% gain.
3. How do I calculate change from a negative number?
The formula uses the absolute value of the original number in the denominator to ensure the direction (increase/decrease) is mathematically correct.
4. Is percentage change the same as ROI?
In many cases, yes. Return on Investment (ROI) is the percentage change of an investment's value over a specific period.