1. What is a Percentage Change Calculator?

Definition: This calculator measures the percentage difference between an old value and a new value.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• New Value — The current or updated measurement
• Old Value — The original or previous measurement

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

3. Importance of Percentage Change Calculation

Details: Percentage change provides a standardized way to compare changes across different scales and units, making trends easier to interpret.

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's the difference between percentage change and percentage difference?
A: Percentage change compares two values over time, while percentage difference compares two simultaneous values.

Q3: How do I interpret a percentage increase from 0?
A: Percentage change from zero is undefined mathematically, as it requires division by zero.

Q4: Can I calculate percentage decrease?
A: Yes, the same formula works - a decrease will simply show as a negative percentage.

Q5: What's a good percentage change?
A: This depends entirely on context - in finance, 5% might be significant, while in population growth it might be modest.