Calculate percentages quickly and accurately. This calculator handles three common percentage problems: finding a percentage of a number, calculating the percentage change between two values, and finding what percentage one number is of another.
To find X% of Y, multiply Y by X and divide by 100. For example, 15% of 200 = 200 × 15 ÷ 100 = 30.
Percentage change = (New Value − Old Value) ÷ Old Value × 100. A positive result means an increase, a negative result means a decrease. For example, a price going from £80 to £100 is a 25% increase.
Divide X by Y and multiply by 100. For example, 30 is what percentage of 200? 30 ÷ 200 × 100 = 15%.