- 1). Find the beginning period's CPI and the current period's CPI from the Bureau of Labor Statistics. The CPI is average amount a basket of goods and services cost at a given period of time. The base for the CPI is 100 and, as prices increase, the number rises from 100. For example, assume your first period the CPI is 119. Then, assume the current period's CPI is 128.
- 2). Subtract your beginning period's CPI from the current period's. In the example, 128 minus 119 equals nine. This is your change in CPI.
- 3). Divide your change in CPI by the beginning period's CPI to calculate the percent change in decimal form. In the example, nine divided by 119 equals .0756.
- 4). Multiply the percent change in decimal form by 100 to convert it to percentage form. In the example, 0.0756 times 100 equals 7.56 percent.
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