Percentage Increase Calculator
Find how much a value has grown — as a percentage — between an old and new number.
About the Percentage Increase Calculator
Whether you are tracking a salary raise, a stock price gain, or website traffic growth, the Percentage Increase Calculator tells you exactly how much something has grown relative to its starting point.
The Formula
Percentage Increase = ((New Value − Original Value) / Original Value) × 100
Example: A product was priced at $80 and is now $100. Increase = ((100 − 80) / 80) × 100 = 25%.
When to Use It
Salary negotiations: If your salary jumps from $55,000 to $62,000, the raise represents a 12.7% increase — a useful figure to include in performance reviews.
E-commerce: Monthly revenue grew from $12,400 to $15,550? That's a 25.4% increase — strong growth to highlight in reports.
Fitness: Lifted 135 lb last month and now lifting 155 lb? You improved by 14.8%.
Real estate: A home bought for $320,000 now appraised at $389,000 represents a 21.6% appreciation.
Common Mistakes
One frequent error is confusing percentage increase with percentage points. If an interest rate rises from 2% to 3%, that is an increase of 1 percentage point, but a 50% increase in the rate itself. Always clarify which metric you mean when communicating changes.
Another mistake is using the new value as the denominator instead of the original. If sales went from 200 to 250, the increase is 50/200 = 25%, not 50/250 = 20%.
Interpreting Large Increases
A 100% increase means the value doubled. A 200% increase means it tripled. For viral social media posts or startup revenue, triple-digit growth percentages are common but must always be viewed alongside absolute numbers to give context.