Percentage Increase & Decrease Calculator (Educational)

Why Percentage Increase and Decrease Matter

Percentage increase and decrease are used to understand how a value changes over time. They help learners compare growth and reduction in a clear and standardized way, regardless of the original number size.

Understanding the Concept

When a value becomes larger than the original, it is called a percentage increase. When a value becomes smaller, it is called a percentage decrease. Both are calculated relative to the original value.

Formulas Used

Step-by-Step Examples

• Increase example: Original = 100, New = 130 → Increase = 30%
• Decrease example: Original = 200, New = 150 → Decrease = 25%

Try the Percentage Increase / Decrease Calculator

How the Result Is Interpreted

A positive result indicates a percentage increase. A negative result indicates a percentage decrease. This interpretation helps learners clearly understand the direction of change.

What You Learn From This Tool

• How increases and decreases are calculated
• Why the original value is always the base
• How to interpret positive and negative results

Common Mistakes to Avoid

• Using the new value as the base instead of the original value
• Ignoring whether the change is an increase or decrease
• Forgetting to multiply by 100

Educational Notice: This calculator is designed for learning and understanding purposes only. Results are simplified and should not be treated as professional calculations.