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Percent Change is an important mathematical function used to measure the increased or decreased value in percentage, from the reference value. Similarly, the increase or decrease percent is applicable in many engineering, finance, chemical industries.How to find percentage Increase or Percentage Decrease? How to calculate percent increase between two numbers? What if you need to calculate percentage increase, but not only by how much a number increased, but also the change in percentage increase between two numbers?Percentage increase and decrease. Due to inconsistent usage, it is not always clear from the context what a percentage is relative to. When speaking of a "10% rise" or a "10% fall" in a quantity, the usual interpretation is that this is relative to the initial value of that quantity.Percentage Change. Subtract the old from the new, then divide by the old value. See percentage change, difference and error for other options. Note: when the new value is greater then the old value, it is a percentage increase, otherwise it is a decrease.