Percentage Increase Calculator
Calculate the new value after increasing a number by a given percentage.
About the % Increase Calculator
Percentage increases show up everywhere from raises and rent hikes to population growth and price adjustments. This calculator takes an original value and a percentage increase and returns both the new total and the dollar (or unit) amount added.
How It Works
The calculator multiplies the original value by the percentage, expressed as a decimal, to find the increase amount, then adds that increase back onto the original value to get the new total.
New Value = Original × (1 + Percent/100); Increase Amount = New Value − Original.
Example
Scenario: Increasing 80 by 15%.
Result: An increase of 12, for a new value of 92.
Assumptions & Limitations
- Assumes a single percentage increase applied once to the original value.
- Works for any unit — dollars, population, quantity — as long as the original value and percent are both provided.
- For a series of repeated increases over time (like compound growth), apply this calculation successively for each period rather than multiplying the percentages together.
Frequently Asked Questions
How is percentage increase different from percentage points?
A percentage increase is relative to the original value (a 15% increase on 80 is 12), while a percentage point change is a simple subtraction between two percentages, which is a different calculation entirely.
What if I know the new value and want to find the original?
Use the Reverse Percentage Calculator, which works backward from a known result and percentage to recover the original value.
Does a 15% increase followed by a 15% decrease return the original value?
No — because the decrease is calculated on the larger, increased value, applying a 15% decrease afterward leaves you slightly below the original starting value.