Calculate percentages, percentage change, and percentage of a number quickly and accurately.
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To find X% of Y, the formula is (X ÷ 100) × Y. For example, to calculate 20% of 150: (20 ÷ 100) × 150 = 30.
To calculate what percentage X is of Y, the formula is (X ÷ Y) × 100. For example, to find what percent 30 is of 150: (30 ÷ 150) × 100 = 20%.
To calculate percentage change (percentage increase or percentage decrease) from X to Y, the formula is ((Y − X) ÷ |X|) × 100. For example, a change from 150 to 180 is ((180 − 150) ÷ 150) × 100 = 20%, representing a 20% increase.
Choose 'X is what % of Y', enter the two numbers, and the calculator divides X by Y and multiplies by 100.
Percentage change is calculated as (New Value − Old Value) ÷ Old Value × 100, showing the increase or decrease as a percentage.
Yes, it works with negative numbers for all three calculation types.
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