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

Enter the original value in START VALUE. Enter the new value in END VALUE.

Choose rounding, then press SOLVE. The working shows the difference, the division step and the final percentage.

If the start value is zero, percentage change is not defined because the formula divides by the start value.

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.

When the result is above zero it is an increase. When it is below zero it is a decrease.

WORKED EXAMPLE

Start value = 100 and end value = 125.

Difference = 125 − 100 = 25.

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

For a decrease, for example 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.

The tool is designed for quick checks while keeping every control and result visible.

COMMON SEARCHES

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Other searches include increase over time calculator, decrease percentage calculator, price change percentage and percentage difference from start to end.

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

RELATED TOOLS

This page belongs to the utility calculators section and links to nearby calculator pages.