What is Core CPI — Core Consumer Price Index?
Core CPI is the Consumer Price Index excluding food and energy prices. Economists and policymakers watch it because food and energy are volatile — stripping them out produces a cleaner signal of the underlying inflation trend.
Live data: Consumer Price Index for All Urban Consumers: All Items Less Food and Energy in U.S. City Average
Federal Reserve Economic Data (FRED) — · Monthly · 146 observations
Most recent observation: 334.17 Index 1982-1984=100 as of March 1, 2026.
Understanding Core CPI
Core CPI removes the food and energy components of the Consumer Price Index. Those two categories are volatile — oil prices swing on OPEC decisions and geopolitical events, food prices swing on weather and harvests — so stripping them out reveals the underlying inflation signal.
Core CPI tends to be stickier than headline CPI because the categories it includes (shelter, medical care, apparel, services) don't turn on a dime. Shelter inflation, in particular, has a multi-quarter lag built in because BLS samples rents over a six-month rotation. This slow-moving nature is both strength and weakness: core CPI avoids false signals from temporary commodity moves, but it can also lag actual inflection points.
The Fed tracks core CPI alongside core PCE, but its formal 2% target references PCE. Markets watch both — the monthly CPI release comes two weeks before PCE, making core CPI the earliest read on the inflation trend each month.
How Core CPI is calculated
Core CPI uses the same methodology as headline CPI but excludes the food and energy components before aggregation. Food is roughly 13% of the CPI basket and energy is 7%; removing them leaves core at roughly 80% of headline basket weights, redistributed proportionally.
Historical context
Core measures were introduced in the 1970s specifically to separate signal from noise during the oil-price shocks. The 1980s disinflation drove core CPI from double digits to under 5%; the 2020s inflation episode drove it from 1.3% in early 2021 to a peak of 6.6% in September 2022 before cooling.
Frequently asked questions
Why exclude food and energy?
Food and energy prices are volatile on short-term supply shocks that reverse quickly. Excluding them reveals the underlying trend in the rest of the economy, which is more relevant for monetary policy decisions that take months or years to fully affect inflation.
Don't people actually buy food and energy?
Yes, and that's why headline CPI matters for household budgets and Social Security adjustments. But for forecasting future inflation and setting interest rates, core is considered a better signal because it filters out one-off price shocks that will reverse.