Consumer price index for all goods, where 2015 prices equal 100

The consumer price index (CPI) is a measure of the relative cost of goods and is used to help calculate inflation. CPI can be indexed to different years, and it can vary between the goods and consumers included in the calculation. This is important to keep in mind when comparing between reported CPI values. This CPI sets 2015 to 100 and looks at all goods purchased by all consumers in the US.