1. What is a Percentage Change Calculator?

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

Purpose: It helps analyze growth, decline, or change in various contexts like finance, statistics, and measurements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The difference between values is divided by the original value, then multiplied by 100 to convert to percentage.

3. Importance of Percentage Change Calculation

Details: Percentage change helps compare relative differences regardless of scale, useful for tracking growth rates, price changes, performance metrics, and more.

4. Using the Calculator

Tips: Enter both old and new values. The old value cannot be zero (division by zero is undefined).

5. Frequently Asked Questions (FAQ)

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

Q2: What if my old value is zero?
A: Percentage change is undefined when the old value is zero, as it would require division by zero.

Q3: How is this different from percentage difference?
A: Percentage change compares two values over time, while percentage difference compares two simultaneous values.

Q4: Can I calculate reverse percentage?
A: Yes, by solving the formula for the unknown value when percentage change is known.

Q5: What's considered a significant percentage change?
A: Significance depends on context - a 5% price change may be significant, while 5% population growth might not be.