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 UK Office for National Statistics explains percentage notation and the distinction between percentages and percentage points.
UK source : Office for National Statistics — Percentages and percentage points.
UK source
UK source : Office for National Statistics — Percentages