1. What is Change Percentage?

Change percentage is a mathematical calculation that shows the relative change between an old value and a new value, expressed as a percentage. It is commonly used in finance, economics, and business to measure price changes, growth rates, and performance metrics.

2. How Does the Calculator Work?

The calculator uses the change percentage formula:

Where:

• \( \text{New} \) — New price or value (currency)
• \( \text{Old} \) — Original price or value (currency)
• \( \text{Change %} \) — Percentage change between old and new values

Explanation: The formula calculates the relative difference between the new and old values as a percentage of the original value.

3. Importance of Price Change Calculation

Details: Calculating price change percentage is essential for financial analysis, investment decisions, inflation tracking, sales performance evaluation, and market trend analysis.

4. Using the Calculator

Tips: Enter the old price and new price in any currency unit. Both values must be positive numbers, with the old price greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What does a positive change percentage indicate?
A: A positive percentage indicates an increase in price or value from the old to new amount.

Q2: What does a negative change percentage indicate?
A: A negative percentage indicates a decrease or reduction in price or value from the old to new amount.

Q3: Can the old price be zero?
A: No, the old price cannot be zero as division by zero is mathematically undefined.

Q4: How is this different from percentage difference?
A: Change percentage measures change relative to the original value, while percentage difference compares two values without designating one as reference.

Q5: What are common applications of change percentage?
A: Stock price changes, inflation rates, sales growth, cost increases, salary adjustments, and performance metrics.