1. What is a Percentage Change Calculator?

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

Purpose: It helps analyze changes in prices, quantities, measurements, and other numerical data over time.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• New — The current or recent value
• Old — The original or previous value

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

3. Interpreting Results

Positive result: Indicates a percentage increase
Negative result: Indicates a percentage decrease
Zero result: No change between values

4. Using the Calculator

Tips: Enter the original value (Old) and the new value (New). The old value cannot be zero.

5. Frequently Asked Questions (FAQ)

Q1: What if my old value is zero?
A: The calculation is undefined when dividing by zero. Use absolute difference instead.

Q2: How do I interpret a negative percentage?
A: A negative percentage indicates a decrease from the old to new value.

Q3: What's the difference between percentage change and percentage points?
A: Percentage change measures relative change, while percentage points measure absolute difference between percentages.

Q4: Can I calculate percentage change over multiple periods?
A: For compound changes, use the formula for each period sequentially.

Q5: How precise are the results?
A: Results are shown with 2 decimal places for precision.