1. What is a Percent Change Calculator?

Definition: This calculator determines the percentage change between two values (old and new).

Purpose: It helps analyze growth, decline, or change in any measurable quantity over time.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( New \) — The current or new value
• \( Old \) — The previous or original value

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

3. Importance of Percent Change Calculation

Details: Percent change is crucial in finance, economics, science, and business to measure growth rates, performance changes, and trends.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What does a positive/negative result mean?
A: Positive means increase, negative means decrease from old to new value.

Q2: How do I interpret a 100% change?
A: A 100% increase means the value doubled. A 100% decrease means it went to zero.

Q3: What if my old value is zero?
A: Percent change is undefined when old value is zero (division by zero).

Q4: Can I use this for percentage difference?
A: No, percentage difference between two values uses a different formula.

Q5: How is this different from percentage points?
A: Percentage points measure absolute difference between percentages, not relative change.