# Percentage increase/decrease free online calculator

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## Percentage increase/decrease calculation

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

percentage increase/decrease = (Vnew - Vold) / Vold × 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 V0 times the percentage increase/decrease p divided by 100:

d = V0 × p / 100

The final value V1 is equal to the initial value V0 plus the difference d:

V1 = V0 + d

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