= 30
= 15%
= +25%
Home / Calculators / Percentage Calculator
Three common percentage calculations in one place.
"X% of Y" is calculated as (X ÷ 100) × Y. "X is what percent of Y" is calculated as (X ÷ Y) × 100. Percent change from an old value to a new value is calculated as ((new − old) ÷ old) × 100, shown as a positive number for an increase and negative for a decrease.