The Consumer Price Index is released by the Bureau of Labor Statistics around the 10th-13th of each month, covering the prior month's data. It's the single most-watched inflation number in the world. When CPI comes in higher than expected, stock markets drop and bond yields spike. When it comes in lower, markets rally. Understanding how to read this report puts you ahead of most people reacting to headlines.
The key numbers to find
Every CPI release contains dozens of data points, but four are the ones that matter most for understanding your purchasing power:
CPI-U All Items YoY is the headline inflation rate — the number you see in news articles. It compares today's prices to the same month a year ago. Currently 2.8%. This is the number most people mean when they say "inflation."
Core CPI strips out food and energy because they're volatile. The Fed watches this number more closely for policy decisions because it shows the underlying trend without short-term swings from oil prices or seasonal food costs. The catch: you still have to eat and heat your home, so "core" inflation isn't what you actually experience.
Month-over-Month shows the direction of change. A 0.1% monthly reading annualizes to about 1.2% — very low. A 0.4% reading annualizes to about 4.9% — much hotter. If you see three consecutive months above 0.3%, inflation is accelerating regardless of what the year-over-year number says.
Shelter is the largest single component at 36% of the index. It moves slowly because it's based on lease renewals and equivalent rent estimates, not real-time housing prices. This lag means shelter CPI can show moderation while actual rents are still climbing — or vice versa.
Where to find CPI data
The BLS publishes the full report at bls.gov/cpi. The release time is 8:30 AM Eastern on the scheduled date. FRED (the Federal Reserve's data portal) archives the full historical series at fred.stlouisfed.org under series ID "CPIAUCSL" for the all-items index.
What CPI doesn't tell you
CPI measures price changes for a curated basket, adjusted for substitution and quality. It does not measure the total dilution of the currency. That's what M2 money supply tracks. The gap between M2 and CPI is the erosion that's already been created but hasn't fully shown up in consumer prices yet.
The Debase Brief breaks down every CPI release the morning it drops — what the numbers mean, how they compare to M2, and what the gap tells you about where prices are heading. No jargon, just the data.
Check what your salary is actually worth using both the CPI view and the M2 view — and see which one matches what your grocery bill tells you.