Free calculator
Percentage Calculator
Calculate percentages, percentage change, increases, decreases and original values instantly.
3020% of 150 = 30
Percentage formulas
X% of Y: Y × X ÷ 100. X is what percent of Y: X ÷ Y × 100. Percentage change: (new value − original value) ÷ |original value| × 100.
How to use this calculator
Select the calculation you need, enter the two known values and the result will update immediately. For worked examples, see the guide to calculating percentages.
Source & methodology
The calculator uses standard percentage arithmetic and keeps percentage change separate from percentage-point change.