Percentage Increase Calculator
This is a worked example. Clear the fields and enter your own values, then press Calculate.
PERCENTAGE INCREASE
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Percentage Increase Calculator
Percentage Calculators
Percentage increase measures how much a value has grown relative to where it started, whether that’s a price going up, a salary rising, or a measurement growing over time. This percentage increase calculator takes your starting and final values, confirms the change is actually an increase, and returns the exact percentage along with a full worked solution.
How to use this percentage increase calculator
- Enter the Starting Value, the original number before the change.
- Enter the Final Value, the number after the change.
- Click Calculate to see the Percentage Increase, a result badge, and the full Solution steps.
- Click Clear to reset both fields.
What this percentage increase calculator does
The calculator compares your Final Value against your Starting Value, using the starting value as the base for the calculation, since it represents the point the change is measured from. Unlike percentage difference, where either value could be entered first, order matters here: the Starting Value and Final Value play distinct, non-interchangeable roles in the formula.
The percentage increase formula
Percentage Increase = (Final Value − Starting Value) ÷ Starting Value × 100
The numerator is simply how much the value grew in absolute terms. Dividing that growth by the Starting Value expresses it as a proportion of where you began, and multiplying by 100 converts that proportion into a percentage. Because the Starting Value is always the denominator, the same absolute increase produces a larger percentage increase when the starting point is smaller, and a smaller percentage increase when the starting point is larger.
Worked example
Using the calculator’s own example figures, a Starting Value of 36 and a Final Value of 45:
Percentage Increase = (45 − 36) ÷ 36 × 100
= 9 ÷ 36 × 100
= 25%
= 9 ÷ 36 × 100
= 25%
The value grew by 9 units, and since that 9-unit growth represents a quarter of the original 36, the result is a 25% increase.
Why the same absolute change can mean different percentages
| Starting Value | Final Value | Absolute Increase | Percentage Increase |
|---|---|---|---|
| 36 | 45 | 9 | 25% |
| 100 | 109 | 9 | 9% |
| 18 | 27 | 9 | 50% |
All three rows share the same absolute increase of 9, but the percentage increase varies considerably depending on the starting value. This is why percentage increase, not the raw difference, is the more meaningful figure when comparing growth across values of different sizes, for example comparing a salary raise or a price hike across two people or products with different starting figures.
What if the final value is lower?
If your Final Value is actually lower than your Starting Value, the change is a decrease, not an increase, and the result badge in this calculator reflects that. For a value that has gone down rather than up, a dedicated percentage decrease calculator applies the same core logic but frames the result appropriately as a reduction.
Frequently asked questions
Does it matter which value I enter as Starting and which as Final?
Yes. The Starting Value is always the base of the calculation (the denominator), and the Final Value represents where the number ended up. Swapping them would produce a different, incorrect percentage relative to what actually happened.
Why does the same numeric increase give a different percentage each time?
Because percentage increase is calculated relative to the Starting Value, the same absolute increase represents a larger percentage when the starting point is small, and a smaller percentage when the starting point is large. This is why percentage figures, not raw differences, are used to compare growth fairly across different scales.
What happens if I enter a Final Value that’s lower than the Starting Value?
That represents a decrease rather than an increase. This calculator is built around increases, so if your value went down, a percentage decrease calculator is the more appropriate tool for framing that result correctly.