1. What is Percentage Change?

Percentage change measures the relative difference between an old value and a new value, expressed as a percentage. It shows how much a quantity has increased or decreased compared to its original value.

2. How Does the Calculator Work?

The calculator uses the percentage change formula:

Where:

• New Value — The current or final value
• Old Value — The original or initial value

Explanation: The formula calculates the relative change between two values. A positive result indicates an increase, while a negative result indicates a decrease.

3. Importance of Percentage Change

Details: Percentage change is widely used in finance, economics, statistics, and everyday life to compare changes over time, analyze growth rates, and make relative comparisons between different quantities.

4. Using the Calculator

Tips: Enter both old and new values. The old value cannot be zero (division by zero is undefined). The calculator automatically determines if the change is an increase or decrease.

5. Frequently Asked Questions (FAQ)

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

Q2: How is percentage change different from percentage difference?
A: Percentage change compares a new value to an old value, while percentage difference compares any two values without considering which is the reference.

Q3: What if my old value is zero?
A: Percentage change is undefined when the old value is zero because you cannot divide by zero. In such cases, you should consider absolute change instead.

Q4: 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.

Q5: How is percentage change used in finance?
A: In finance, it's used to calculate returns on investments, track stock price changes, and analyze revenue growth or decline.