## Percentage change calculator

[Math_m_Percentage_change_calculator]

## Percentage change calculation

The percentage change 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 change = (*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 change = (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 change = (800$ – 1000$) / 1000$ × 100%

= -0.2 × 100% = -20%