Core Consumer Price Index (Core CPI)
Core CPI is the standard CPI with the highly volatile categories of food and energy removed. It is formally referred to by BLS as "CPI for all items less food and energy."
At A Glance#
| Field | Detail |
|---|---|
| Provider | U.S. Bureau of Labor Statistics (BLS) |
| Survey / Tool | Consumer Price Index Survey |
| Frequency | Monthly |
| Indicator Type | Lagging |
| Main Use | Reveals underlying "sticky" structural inflation by removing food and energy volatility |
| Timeframe Tracked | Short to Medium-Term (1–2 Years); preferred over headline CPI for structural inflation analysis |
| Source | Published within the main CPI release at https://www.bls.gov/cpi/ |
What It Is#
Core CPI is the standard CPI with the highly volatile categories of food and energy removed. It is formally referred to by BLS as "CPI for all items less food and energy."
By stripping out short-term price shocks — such as a sudden oil shortage or a drought affecting crop yields — Core CPI reveals the underlying structural inflation trend in the economy. Economists rely heavily on Core CPI rather than headline CPI to understand "sticky" inflation: price increases that become embedded in wages, contracts, and expectations rather than reflecting a one-time supply shock.
Who Provides It#
The U.S. Bureau of Labor Statistics (BLS), published as part of the main monthly CPI release. There is no separate survey for Core CPI.
How It Is Collected#
Core CPI uses the exact same data collection process as headline CPI. BLS still collects approximately 100,000 prices per month from stores, service providers, websites, apps, and rental housing units. The difference arises only at the computation stage, not the collection stage.
How It Is Computed#
Core CPI is computed as:
Core CPI = CPI excluding food and energy
BLS strips out the following volatile categories from the total CPI calculation:
- Food at home
- Food away from home
- Gasoline
- Fuel oil
- Electricity
- Utility gas service
The remaining categories — shelter, apparel, medical care, recreation, education and communication, transportation services, and other goods and services — are retained and re-weighted. The reason for excluding food and energy is that their prices often move sharply due to weather, oil prices, geopolitical shocks, and supply disruptions that say little about broad demand-driven inflation pressure.
Indicator Type#
Lagging. Core CPI still measures price changes that have already occurred and is released after the reference period. However, it is more useful than headline CPI for identifying whether inflation is becoming persistent, because it removes the most volatile components that can temporarily distort the overall reading.
Why It Matters#
Core CPI is the preferred measure for diagnosing structural inflation. Because food and energy prices can swing sharply due to events entirely unrelated to domestic demand pressure, headline CPI can send misleading signals about the underlying inflation trend. Core CPI provides a cleaner read on whether inflation is durable and broad-based.
Analysts watch Core CPI alongside Core Personal Consumption Expenditures Price Index (Core PCE) (the Fed's official target) to cross-check the inflation picture from two different methodologies and data sources.
Related Notes#
- Consumer Price Index (CPI) — the headline measure this is derived from
- Core Personal Consumption Expenditures Price Index (Core PCE) — the Federal Reserve's preferred core inflation gauge
- Personal Consumption Expenditures Price Index (PCE) — the broader, dynamic-weight BEA alternative
- Why Inflation Indicators Are Lagging — why all four inflation measures are lagging