The Minneapolis Fed's table of annual average CPI shows 9.9 for 1913 and 321.9 for 2025. That is a gap of more than thirty times. One dollar in the first year and one dollar in the last are not the same thing at the register. The BLS inflation calculator exists to put a number on that gap.
What the BLS inflation calculator does
The CPI Inflation Calculator is an official tool from the U.S. Bureau of Labor Statistics. You give it a dollar amount and two dates. It tells you what that amount would be worth in the other year, based on changes in consumer prices. The BLS calculator page is the place to find it.
It runs on the Consumer Price Index, or CPI. That is a measure of the change in prices paid by urban consumers for a market basket of goods and services. Think of a cart that holds groceries, rent, gas, and doctor visits. BLS says the CPI reflects the spending patterns of more than 90% of the U.S. population.
That breadth is the point, and also the limit. The result describes average price change. It does not describe your cart.
How to enter your numbers
The workflow is short. Enter a starting amount. Pick the starting date. Pick the ending date. The tool compares the price level at each date and reports the equivalent amount.
Read the dates with care. A figure built on an annual average says something different from one built on a single month. A rent notice dated March and a grocery receipt dated October may not sit neatly inside the same yearly number.
One gap to flag: the BLS page text I reviewed does not walk through each on-screen field. So read the labels and any notes on the page. If a label is unclear, the BLS CPI frequently asked questions are the next stop.
The math behind the result
Each CPI value is an index. The index is set to 100 in a base period, and later values are measured against it. The Minneapolis Fed table uses 1983 as that base. A reading of 200 means the basket costs twice what it did then.
The inflation rate for a period is the change in the index divided by the earlier index value, times 100. To move a price forward, the Minneapolis Fed gives this formula: Year 2 price equals Year 1 price times the Year 2 CPI divided by the Year 1 CPI.
You can check the calculator by hand. Take the annual averages from the Minneapolis Fed table and run the formula. The table shows 2021 at 4.7% and 2022 at 8.0%. Those are year-over-year changes, and they compound. A month-over-month view would show the same climb in smaller, steadier steps.
Choosing the right series and source
For a general question about prices, the all-items CPI is the standard. For a narrower question, BLS publishes more specific series for food and beverages, housing, and medical care. If you want to know about a lease renewal, a housing series is a closer fit than the headline number.
The Minneapolis Fed also runs a calculator. Both are government-affiliated. Running the same question through each is a reasonable cross-check.
Be wary of third-party explainers. One commercial page I reviewed gave the inflation step with a misplaced parenthesis. Others cite no official source. Use them for background at most, and check any formula against BLS or Minneapolis Fed material.
Questions to ask before trusting a figure
Three questions do most of the work.
- Which CPI series is this? All items, a region, or a category.
- Which years does it cover, and are they annual averages or one month?
- Is the data current, and could it be revised?
The last one matters now. As of this June 2026 writing, coverage has reported that inflation reached a three-year high in May 2026 and has slowed somewhat since. Recent months can change after first publication. A figure built on the newest numbers may shift slightly later.
What the calculator cannot tell you
It measures a broad basket. It cannot tell you how inflation hits one household's budget, savings, debts, or interest costs. The sources I reviewed do not cover those personal questions.
Use the tool to understand general price trends and to check historical comparisons. For decisions that depend on your own situation, a qualified financial professional is the right contact. This article is educational only, and the official BLS pages are the place to confirm the data.
