How to Calculate Percentage Increase and Decrease

Understanding how to calculate percentage increase and decrease is essential for analyzing trends, whether it's the growth of your business or the rise in your monthly expenses.

What is Percentage Change?

Percentage change measures the relative difference between an old value and a new value.

The Unified Formula for Percentage Change

There is actually one single formula that handles both increases and decreases:

Formula: Percentage Change = ((New Value - Old Value) / Old Value) * 100

• If the result is positive, it's a percentage increase.
• If the result is negative, it's a percentage decrease.

Using two separate formulas for increase and decrease is a common source of confusion. The sign of the result already tells you everything you need to know.

Real-World Example: Sales Growth

Imagine your online store made $1,000 last month and $1,250 this month.

• Difference: $1,250 - $1,000 = $250
• Calculation: ($250 / $1,000) * 100 = 25%
• Result: You've experienced a 25% increase in sales!

Why Use an Online Calculator?

While the math is straightforward, manual calculations can lead to errors, especially with complex numbers. Our Percentage Increase Calculator handles these calculations instantly, providing both the absolute and relative change.

Mastering these simple formulas will give you a much clearer picture of your data and progress.