Calculate percentage increase, percentage decrease, percentage difference, and "what is X% of Y" with step-by-step math.
The term percent originates from the Latin per centum, meaning "by the hundred."
A common error in financial reports is confusing percentage increase with percentage points. For example, if interest rates increase from 4% to 5%, that represents a 1 percentage point increase, but a 25% relative increase in the cost of borrowing.
Suppose a company achieved $80,000 in revenue last quarter (Value A) and $100,000 this quarter (Value B):
Step 1: Calculate absolute difference → 100,000 - 80,000 = +20,000.
Step 2: Divide by initial value → 20,000 ÷ 80,000 = 0.25.
Step 3: Multiply by 100 → +25.00% Increase.
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