Percentage Change Calculator

What is the Percentage Change Calculator?

Percentage change tells you how much something has grown or shrunk relative to its original value. It's one of the most-used quick calculations in everyday life: price comparisons, stock returns, sales data, test score improvements, population shifts. This calculator takes two numbers — old and new — and gives you the percentage change between them. CalciHub's version also handles percentage decrease and shows whether the change was a gain or a loss.

How Does It Work?

Subtract the old value from the new value, divide that by the old value, then multiply by 100 to express it as a percentage. A positive result is an increase; a negative result is a decrease.

Percentage Change = ((New Value - Old Value) / Old Value) × 100

• New Value = The value after the change

• Old Value = The original starting value

• Result = Positive means increase, negative means decrease

How to Use CalciHub's Percentage Change Calculator

1. Enter the original (old) value.

2. Enter the new value.

3. Click Calculate.

4. The result shows the percentage change, labeled as an increase or decrease.

Tip: Don't confuse percentage change with percentage points. If a rate goes from 10% to 15%, that's a 5 percentage-point increase — but a 50% change relative to the original 10%.

A Quick Example

A product's price dropped from 80 to 60. What's the percentage change?

• Old Value = 80

• New Value = 60

• Change = (60 - 80) / 80 × 100 = -20 / 80 × 100 = -25%

The price fell by 25%. That's a meaningful discount — and having the exact percentage makes it easy to compare against other products or promotional offers without guessing.

Frequently Asked Questions