1. What is a Percentage Change Calculator?

Definition: This calculator measures the percentage increase or decrease between two values.

Purpose: It helps analyze growth rates, price changes, performance improvements, and other comparative metrics.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The difference between new and old values is divided by the old value, then multiplied by 100 to get a percentage.

3. Understanding Percentage Change

Positive Result: Indicates an increase (new value is larger than old value)

Negative Result: Indicates a decrease (new value is smaller than old value)

4. Using the Calculator

Tips: Enter both old and new values. The old value must be greater than zero (division by zero is undefined).

5. Frequently Asked Questions (FAQ)

Q1: What does a 100% increase mean?
A: It means the new value is double the old value (100% larger).

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

Q3: What does a negative percentage mean?
A: It indicates a decrease from the old value to the new value.

Q4: Why can't the old value be zero?
A: Division by zero is mathematically undefined.

Q5: How is this different from percentage difference?
A: Percentage change compares two values over time, while percentage difference compares two simultaneous values.