Calculate the percentage difference or percentage change between two values. Includes percentage increase, percentage decrease, and the formula explained step by step.
Percentage change = ((100 - 80) / 80) × 100 = 25% increase.
Percentage change measures how much a value changed from an original (directional). Percentage difference measures the relative difference between two values without a direction — useful when neither value is the "original".
Formula: ((New Value - Original Value) / Original Value) × 100. Example: from 50 to 75 = ((75 - 50) / 50) × 100 = 50% increase.
Formula: ((Original Value - New Value) / Original Value) × 100. Example: from 100 to 80 = ((100 - 80) / 100) × 100 = 20% decrease.
15% of 200 = 200 × 0.15 = 30.
Divide the first number by the second and multiply by 100. Example: 30 is what percent of 200? = (30 / 200) × 100 = 15%.
Percentage difference = |75 - 50| / ((75 + 50) / 2) × 100 = 25 / 62.5 × 100 = 40%.
If a value increased by X%, the reverse decrease is X/(1 + X/100) × 100. For example: if $80 increased 25% to $100, then $100 decreased by 20% to reach $80.