The simple version

There are three inflation numbers that regularly show up in news coverage. CPI, the Consumer Price Index, is published by the Bureau of Labor Statistics. PCE, the Personal Consumption Expenditures Price Index, is published by the Bureau of Economic Analysis. And core means either of those measures with food and energy prices removed. They are not the same number, and they often disagree by a few tenths of a percentage point in any given month, sometimes by more. Here is why it matters to your money before we go further: the Federal Reserve sets its 2% inflation target against PCE, not CPI, so when economists ask whether the Fed is hitting its target, they are looking at a different number than the headline CPI figure most news stories quote.

This piece is the decoder. What each measure tracks, why they differ, and what a 3.8% inflation rate, the most recent CPI reading, actually does to cash over time.

The numbers

• U.S. consumer prices rose 3.8% over the 12 months through April 2026 by the headline CPI measure. (BLS)
• The Federal Reserve's stated inflation target is 2% measured against the PCE Price Index, not CPI. (Federal Reserve, FOMC longer-run goals statement)
• PCE has historically run several tenths of a percentage point below CPI, mostly because of methodology differences in how the two indexes are constructed. (BEA, Federal Reserve research)
• Core inflation, both CPI and PCE, strips out food and energy. Both BLS and BEA publish a headline number and a core number every month. (BLS, BEA)

Why the Federal Reserve targets PCE, not CPI

Three structural differences explain why the Fed prefers PCE. First, the weights. CPI weights are updated annually based on a household spending survey. PCE weights update every quarter based on actual current spending, which means PCE captures faster when households substitute, say, switching to chicken when beef prices rise. Second, the coverage. CPI tracks out-of-pocket spending by urban consumers, which leaves out some health care spending paid for by employers and insurers. PCE includes that broader spending. Third, the formula. PCE uses a formula that better accounts for substitution, while CPI uses one that does not, fully, until weights are next refreshed. The Fed's research and policy framework, restated most recently in its longer-run goals statement, says PCE gives a more complete and accurate picture of the cost of living for the broad U.S. economy, which is why the 2% target is set against PCE.

Core inflation is a separate concept. Core means inflation measured without food and energy prices, both of which can swing sharply from month to month for reasons that have nothing to do with broader price trends, things like a freeze in Brazil or a pipeline outage. Stripping food and energy is meant to reveal the underlying trend, not because food and gas do not matter to households, they obviously do, but because including them makes month-to-month numbers noisy. The Fed watches both headline and core PCE for that reason. So does the bond market.

The Real Cost lens

The most useful way to feel an inflation number is to apply it to cash over a long horizon. Take $10,000 held as cash, not invested, just sitting in a checking account, and ask what it buys after thirty years at two different rates. At the Federal Reserve's 2% target, the $10,000 still nominally reads $10,000 thirty years from now, but it would buy roughly what $5,521 buys today. At 3.8%, the most recent CPI headline rate, the same $10,000 would buy roughly what $3,266 buys today. The gap between those two numbers, about $2,255 of purchasing power on a single $10,000 starting balance, is the long-run cost of inflation running consistently above the Fed's target rather than at it. That gap is also why monetary policy is run against an inflation target at all. The 1.8 percentage points between 2% and 3.8% sounds small in a single year. Compounded for thirty, it is over a fifth of the original balance, gone.

What this means

The next time a news story quotes an inflation number, the useful question is which one. Headline CPI is the splashiest and the one most commonly cited in news coverage and political debate. Core PCE is the one the Federal Reserve is actually trying to anchor at 2%. They will usually move in the same direction but rarely by the same amount in any given month. A meaningful gap between headline and core, in either CPI or PCE, often signals that something specific is driving the difference, like an oil shock, which moves headline but not core. A meaningful gap between CPI and PCE, with both measured the same way, usually reflects the structural methodology differences described above and is less informative for any one month's reading.

What this is NOT

This is not a prediction of where inflation goes next, in either measure. This is not advice about what to do with cash savings, including whether to move money into bonds, stocks, I bonds, or any specific asset. This is not a buy or sell signal on anything. This is not a political statement about the Federal Reserve, any administration, or current monetary policy. This is only an explanation of what CPI, PCE, and core inflation measure, why the Federal Reserve targets PCE, and what the current CPI headline rate does to cash held over a long horizon.

Sources

• U.S. Bureau of Labor Statistics, Consumer Price Index: https://www.bls.gov/cpi/
• U.S. Bureau of Economic Analysis, Personal Consumption Expenditures Price Index: https://www.bea.gov/data/personal-consumption-expenditures-price-index
• Federal Reserve, Statement on Longer-Run Goals and Monetary Policy Strategy: https://www.federalreserve.gov/monetarypolicy/files/FOMC_LongerRunGoals.pdf
• Federal Reserve Bank of St. Louis (FRED), Core PCE Price Index: https://fred.stlouisfed.org/series/PCEPILFE
• Federal Reserve, FAQ on the Fed's 2% inflation goal: https://www.federalreserve.gov/faqs/economy_14400.htm