# How to Calculate Year on Year

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• 1). Determine the amount of an item from an accounting period in year one and the same accounting period in year two for which you want to calculate the year-on-year change. Years one and two can be any two consecutive years. For example, calculate the year-on-year change in \$500,000 in second-quarter revenue in year one to \$650,000 in second-quarter revenue in year two.

• 2). Subtract the amount of the item in year one from the amount of the item in year two. For example, subtract \$500,000 from \$650,000, which equals \$150,000.

• 3). Divide your result by the amount of the item in year one. For example, divide \$150,000 by \$500,000, which equals 0.3.

• 4). Move the decimal two places to the right in your result and round to the tenths place, if necessary, to express the result as a percentage. For example, convert 0.3 to 30 percent. This is the year-on-year change in second-quarter revenue, which means the company's revenue grew 30 percent year-on-year.