Calculate the percentage increase or decrease between two values
Percentage change measures how much a value has increased or decreased relative to its original value. The formula is: Percentage Change = ((New Value - Old Value) ÷ Old Value) × 100. A positive result means an increase; a negative result means a decrease.
If a stock price goes from $80 to $100, the percentage change is ((100-80) ÷ 80) × 100 = 25% increase. If your rent goes from $1,500 to $1,350, the change is ((1350-1500) ÷ 1500) × 100 = -10%, meaning a 10% decrease.