WHAT THIS TOOL DOES

This percentage change calculator finds the percentage increase or percentage decrease between two values.

Use it for prices, sales, population, scores, measurements, website traffic, stock levels, costs or any old-to-new comparison.

A positive answer means increase. A negative answer means decrease. Zero means no change.

HOW TO USE IT

Page 1 enters the original start value and the new end value.

Page 2 chooses rounding and solves the calculation.

Page 3 shows the formula, working and final percentage change.

If the start value is zero, percentage change is not defined.

PERCENTAGE CHANGE FORMULA

Percentage change = (end value − start value) ÷ start value × 100.

The difference shows how far the value moved.

Dividing by the start value compares that movement with the original size.

Above zero is an increase. Below zero is a decrease.

WORKED EXAMPLE

Start value = 100 and end value = 125.

Difference = 125 − 100 = 25.

Percentage change = 25 ÷ 100 × 100 = 25% increase.

For 100 to 80, the answer is −20%.

WHO USES IT

Students use it for percentage increase and decrease questions.

Shoppers use it for price changes and discounts.

Businesses use it for revenue, cost, traffic and performance comparisons.

Teachers use it to show the full working clearly.

COMMON SEARCHES

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Other searches include increase over time calculator, decrease percentage calculator, price change percentage and percentage difference.

This page answers the calculation directly without hiding the calculator behind SEO text.

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This page belongs to the utility calculators section.

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