A percentage is a number expressed as a fraction of 100. It is often denoted using the percent sign (%). For example, 45% represents 45 out of 100, or 45/100 as a fraction, or 0.45 as a decimal. Percentages are used to express how large or small one quantity is relative to another quantity.
Calculate a percentage of a number. For example, to find 20% of 150, enter 20 in the first field and 150 in the second. The result will be 30.
Find what percentage one number is of another. For example, to find what percentage 30 is of 150, enter 30 in the first field and 150 in the second. The result will be 20%.
Calculate the percentage increase or decrease. For example, to find the percentage change from 100 to 120, enter 100 as the Origin and 120 as the New value. The result will be 20% (increase).