This calculator requires the use of Javascript enabled and capable browsers. This calculator is designed to give the percentage change from one number value to another. If you need to obtain the percentage of hours of the day, try our Hours In The Day Percentage Calculator. If you need to obtain the percentage of days of the month, try our Days In The Month Percentage Calculator. If you need information on percent change per capita, use our Percentage Change Per Capita Calculator. By definition, percentage is a fraction or ratio expressed as part of 100. Percentage change is that action over time, long term, brief or momentary. Percentage change from one number to another number, is determined by dividing the difference of the two numbers by the original number. Obviously, there are two types of change, increase and decrease.

To determine percentage increase, divide the change by the original number. An increase from 25 to 75 is calculated in this manner. The difference is 50. 50/25 = 2. That figure times 100 = 200%, or an increase of 200%. Decrease is the exact same process. To determine the percentage decrease, make these calculations. A decrease from 75 to 50 works is calculated in this manner. 25/75 = .33, or a 33% decrease. In order to figure a percentage increase of anything, multiply the number by the percentage. For example if you have a number of 100 and you wish to increase it by 50%, multiply 100 by 1.50 and get the result of 150. To determine the percent decrease of a number would be calculated like this. A 25% decrease of 100 is found by multiplying 100 by (100% - 25%) .75, or 75.