Percentage Change Calculator – Measure Growth and Decline Accurately

The Percentage Change Calculator is a valuable tool for identifying how much a value has increased or decreased over time, relative to its original amount. Whether you're analyzing sales data, investment performance, or even weight loss, this calculator gives you fast and precise results.

What is Percentage Change?

Percentage change is the rate of increase or decrease between two values, expressed as a percentage of the original (starting) value. It’s one of the most common ways to describe trends and fluctuations in data.

Formula

Percentage Change = ((New Value − Original Value) / Original Value) × 100

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

When to Use Percentage Change

• Finance: Track investment returns or price fluctuations.
• Business: Measure revenue growth or cost reduction over time.
• Health: Monitor weight loss or gain as a percentage.
• Education: Compare exam scores between terms or years.

Examples

• Original price = $50, new price = $65 → 30% increase
• Initial value = 200 users, new value = 150 users → 25% decrease
• Started with 80, now 100 → ((100−80)/80)×100 = 25% growth

Tips

• Always base the calculation on the original (old) value.
• This is not the same as percentage difference (which compares values symmetrically).
• In business reports, showing percentage change communicates trends more clearly than raw numbers.

Ready to track your change? Use our Percentage Change Calculator below to understand performance, progress, or loss in any area of life or work.