Calculate percentages easily. Find what percent of a number is, percent increase/decrease, and more.
B% of A = A × B ÷ 100 | A is what % of B? = (A ÷ B) × 100 | Percent change = (B − A) ÷ A × 100 | Percent difference = |A − B| ÷ ((A + B) ÷ 2) × 100 | Percent error = |Observed − Actual| ÷ |Actual| × 100Five percentage modes: find a percentage of a number, express one number as a percentage of another, calculate percent change, percent difference, or percent error.