1. What is Percentage Change?

Percentage change measures the relative change between an old value and a new value, expressed as a percentage. It's widely used in finance, economics, science, and everyday life to track growth, decline, or variation over time.

2. How Does the Calculator Work?

The calculator uses the percentage change formula:

Where:

• \( New \) — New value or current value
• \( Old \) — Old value or original value

Explanation: The formula calculates the difference between new and old values relative to the original value, then converts it to a percentage for easy interpretation.

3. Importance of Percentage Change Calculation

Details: Percentage change is essential for analyzing trends, comparing performance, making investment decisions, tracking growth rates, and understanding market fluctuations across various industries.

4. Using the Calculator

Tips: Enter the old value and new value in any consistent units. The old value must be greater than zero. Positive results indicate increase, negative results indicate decrease.

5. Frequently Asked Questions (FAQ)

Q1: What does a negative percentage change mean?
A: A negative percentage change indicates a decrease or reduction from the old value to the new value.

Q2: Can percentage change be more than 100%?
A: Yes, percentage change can exceed 100% when the new value is more than double the old value.

Q3: What if the old value is zero?
A: The calculation is undefined when old value is zero, as division by zero is mathematically impossible.

Q4: How is percentage change different from percentage point?
A: Percentage change measures relative change, while percentage points measure absolute difference between two percentages.

Q5: Where is percentage change commonly used?
A: Stock market analysis, sales growth tracking, population studies, inflation rates, academic performance, and scientific experiments.