The US Inflation Rate Calculator calculates the accumulative US inflation rate through selectable times that can range from January 1913 to the most current month in 2015. If you’re looking to see how the buying power of the dollar has changed between two dates, use the popular Inflation Calculator instead.

To use this calculator, simply select starting and ending months and years. The accumulative inflation rate will automatically display as soon as enough information is available.

Like other inflation-related calculators, the US Inflation Rate Calculator relies on Consumer Price Index data published monthly by the government — specifically, the Bureau of Labor Statistics. The CPI is a government measure of change in prices of goods and services at the consumer level. The calculator simply looks up the selected monthly CPI figures, compares them and then displays the accumulate inflation rate.