What is the Percentage Increase Calculator?
The Percentage Increase Calculator measures how much a value has grown or declined relative to its original value. It computes the difference between the new and old values, divides by the original, and multiplies by 100. A positive result indicates growth, while a negative result indicates a decrease.
How does it work?
Enter the original value and the new value. The calculator subtracts the original from the new, divides by the original, and multiplies by 100. The result shows the percentage change, which can be positive for increases or negative for decreases.
Formula
((new - old) / old) x 100
How the calculation works
How the calculation works
- 1Enter the original baseline value
- 2Enter the new value after the change
- 3Subtract the original from the new value
- 4Divide the difference by the original value
- 5Multiply by 100 to express the change as a percentage
Worked example
Worked Example
Arjun, the founder of a small SaaS startup, raised his monthly plan price and saw monthly revenue move from ₹100,000 to ₹150,000. He wants to report the growth rate.
- 1Find the absolute change: 150 − 100 = 50
- 2Divide the change by the original value: 50 ÷ 100 = 0.5
- 3Multiply by 100: 0.5 × 100 = 50
- 4The result is a 50% increase
Result
The value grew from 100 to 150, a 50% increase, meaning revenue rose by half of its original size.
Interpretation guide
How to read your result
The new value is lower than the original, so you are looking at a percentage decrease, not an increase.
Investigate the cause of the decline and review periods separately, as percentage decreases can be more severe than the absolute numbers suggest.
Steady improvement that outpaces inflation but is not dramatic, typical of mature products or routine annual price adjustments.
Compare the rate against your industry's typical growth to decide whether to accelerate investment or optimize efficiency.
Meaningful acceleration, common in early-stage businesses or after a successful launch or pricing change.
Confirm the growth is durable by checking whether it persists across several consecutive periods.
The value more than doubled from the baseline, which usually indicates a very small starting base or a step-change event.
Check the baseline: a tiny original value inflates the percentage, so pair the percentage with absolute numbers.
Common mistakes
- - Using the new value as the denominator instead of the original value
- - Comparing percentage changes from different base values without context
- - Confusing percentage points with percentage change in rates
Practical tips
Practical tips
Always use the original value as the denominator; using the new value gives a different, misleading percentage.
A negative result means a percentage decrease, not a negative value; report it as e.g. a 25% decrease.
Pair percentage change with absolute change, since a 100% rise on a tiny base is still a small amount.
For year-over-year analysis, always compare the same month or quarter to avoid seasonality distortions.
When comparing growth rates, verify both periods used the same definition of revenue or quantity.
When should you use it?
- - Measuring sales or revenue growth across periods
- - Calculating price increases or decreases for financial analysis
- - Comparing growth rates between different investments or business units
- - Reporting performance metrics in business presentations
Benefits
- - Provides a standardized way to compare changes across different scales
- - Handles both increases and decreases in a single calculation
- - Supports data-driven decision making with clear percentage metrics
Step-by-step example
Identify the original baseline value. Determine the new value after the change. Subtract the original from the new to find the absolute change. Divide the change by the original value and multiply by 100 to express it as a percentage.
Real-world example
A company's revenue grew from Rs 100,000 to Rs 150,000 over a year. The percentage increase is 50%, meaning revenue grew by half of its original value. If revenue had dropped to Rs 75,000, the percentage change would be negative 25%.