Is Percent Change Calculator free?

Yes, it's completely free to use. No registration or login required.

What's the difference between percent change and percent difference?

Percent change measures the relative change from an initial value to a final value. Percent difference compares two values without direction, using their average as the reference.

Does this tool upload my data?

No. All calculations happen in your browser. No data is uploaded to any server.

What does a negative result mean?

A negative percent change means a decrease. For example, from 100 to 80 is -20%, meaning a 20% decrease.

Can I use this on mobile?

Yes. The tool is responsive and works on phones, tablets, and desktops.

Free Online Percent Change Calculator - Calculate Percentage Inc...

How to Use

Enter the initial value (starting number)
Enter the final value (ending number)
Click "Calculate" to get the percent change
All calculations happen locally in your browser

What is Percent Change?

Percent change measures the relative change between an initial value and a final value. The formula is:

Percent Change = (Final - Initial) / |Initial| × 100%

Common uses include: stock market changes, sales growth analysis, population change, price changes, and test score comparisons.

Frequently Asked Questions

Q: Is the result positive or negative?

Positive means growth (e.g., 100→150 is +50%). Negative means decrease (e.g., 100→80 is -20%).

Q: What if the initial value is 0?

Percent change cannot be calculated when the initial value is 0 (division by zero). The tool will show an error message.

Q: What's the difference between percent change and percentage points?

Percent change is a relative measure (a rate going from 5% to 6% is a 20% increase). Percentage points are absolute (5% to 6% is a 1 percentage point increase).

Q: How do I calculate a discount percentage?

A discount is the percent change in price. For example, $200 to $150 = (150-200)/200 × 100% = -25%, meaning a 25% discount.

Q: Does it work offline?

Yes. After the page loads, all calculations work offline since everything runs locally in your browser.

Q: How accurate is the result?

Results are accurate to 4 decimal places using JavaScript's double-precision floating point (15-17 significant digits).

📊 Percent Change Calculator

How to Use

What is Percent Change?

Frequently Asked Questions