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, or any numerical values over time.

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
• The result is expressed as a percentage (%)

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

3. Importance of Percentage Change Calculation

Details: Percentage change is widely used in finance, economics, science, and business to compare changes over time, analyze trends, and make data-driven decisions.

4. Using the Calculator

Tips: Enter both old and new values. The calculator handles both increases (positive result) and decreases (negative result). Old value cannot be zero.

5. Frequently Asked Questions (FAQ)

Q1: What does a negative percentage change 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 the old value is zero (division by zero). Use absolute change instead.

Q3: How is this different from percentage difference?
A: Percentage change compares two values over time, while percentage difference compares two simultaneous values.

Q4: Can I calculate reverse percentage change?
A: Yes, you can rearrange the formula to find the original value given the percentage change and new value.

Q5: What's considered a significant percentage change?
A: Significance depends on context. In finance, 5% might be significant, while in scientific measurements, 0.1% could be crucial.