Percentage Calculator
Calculate percentages for discounts, tips, or grade calculations.
History (0)
What is X% of Y?
What is% of?
Result10
X is what % of Y?
is what % of?
Result20%
X is Y% of what? (reverse)
is% of ?
Result125
Formulas — X% of Y: (X/100)·Y · X is what % of Y: (X/Y)·100 · reverse: X/(Y/100) · change: (new−old)/|old|·100 · difference: |A−B|/((A+B)/2)·100 · stacked discount: multiply successive (1−dᵢ) factors · percent error: |exp−theo|/|theo|·100.
Inputs accept a trailing % and comma decimals (e.g. 12,5). Division by zero shows an explicit error instead of Infinity.