1. What is a Percentage Decrease Calculator?

Definition: This calculator determines the percentage decrease between an old value and a new value.

Purpose: It helps users quantify reductions in values like prices, quantities, or measurements in percentage terms.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Old — Original value before decrease
• New — Value after decrease

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

3. Importance of Percentage Decrease Calculation

Details: Percentage decrease helps compare reductions across different scales and is widely used in finance, retail, and statistics.

4. Using the Calculator

Tips: Enter both old and new values. The old value must be greater than 0 and greater than or equal to the new value.

5. Frequently Asked Questions (FAQ)

Q1: What does a negative result mean?
A: A negative result indicates a percentage increase rather than decrease (when new value > old value).

Q2: Can I use this for price reductions?
A: Yes, this is commonly used to calculate discount percentages and price drops.

Q3: What's the difference between percentage decrease and percentage difference?
A: Percentage decrease specifically measures reduction, while percentage difference can be either increase or decrease.

Q4: How do I interpret a 0% result?
A: This means there was no change between the old and new values.

Q5: Why is the old value required to be greater than 0?
A: Division by zero is undefined in mathematics, so we need a positive old value.