The percentage increase calculator is a useful tool to calculate the increase from one value to another in terms of percentage of the original amount. Before using the calculator, you should understand how to calculate percent increase by using the percent increase formula. The upcoming sections will explain these concepts in further detail.

## Percentage increase/decrease calculation

The percentage increase/decrease from old value (V_{old}) to new value (V_{new}) is equal to the old and new values difference divided by the old value times 100%:

percentage increase/decrease = (*V*_{new} - *V*_{old}) / *V*_{old} × 100%

#### Example #1

Price percentage increase from old value of 1000$ to new value of 1200$ is caluclated by:

percentage increase = (1200$ - 1000$) / 1000$ × 100%

= 0.2 × 100% = 20%

#### Example #2

Price percentage decrease from old value of 1000$ to new value of 800$ is caluclated by:

percentage decrease = (800$ - 1000$) / 1000$ × 100%

= -0.2 × 100% = -20%

## Difference and final value calculation

The difference d is equal to the initial value *V*_{0} times the percentage increase/decrease p divided by 100:

*d* = *V*_{0} × *p* / 100

The final value *V*_{1} is equal to the initial value *V*_{0} plus the difference d:

*V*_{1} = *V*_{0} + *d*

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