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 between two values in finance, statistics, business, and other fields.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• New — The updated or current 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 percentage.

3. Importance of Percentage Change Calculation

Details: Percentage change helps compare relative differences regardless of the absolute values, making it useful for:

• Financial growth analysis
• Sales performance tracking
• Scientific data comparison
• Market trend analysis

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 result 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 old value is zero (division by zero). Consider absolute difference instead.

Q3: How is this different from percentage difference?
A: Percentage change compares new to old, while percentage difference compares any two values symmetrically.

Q4: Can I calculate reverse percentage?
A: Yes, if you know the percentage change and either old or new value, you can calculate the missing value.

Q5: What's considered a significant percentage change?
A: Significance depends on context. In finance, 5% might be significant, while in scientific measurements, 0.5% could be crucial.