What is headline inflation versus core inflation?

Headline inflation is the change in a consumer price index that includes all items, including food and energy. Core inflation is usually that same index with food and energy removed, so a volatile commodity move does not hide the rest of the basket. The split exists because food and energy can jump for reasons a central bank cannot reverse quickly, while the all items rate is still what households pay. In the United States the usual pairs are the Consumer Price Index (CPI) and the Personal Consumption Expenditures (PCE) price index, each with a core version that drops food and energy. In the United Kingdom the inflation target is on CPI, the Office for National Statistics (ONS) also publishes CPIH, and its core style measures drop energy, food, alcohol and tobacco. This page is educational only. It is not investment advice.

Headline and core side by side

The labels sound like two philosophies. They are two aggregates from one price collection. Headline keeps the full basket. Core drops categories that often swing. The rows below are the US and UK versions of that idea. Series IDs are the public codes on FRED, the data site of the Federal Reserve Bank of St. Louis. Country context sits on the United States and United Kingdom pages. The short definition is the glossary entry for inflation.

CPIAUCSL and CPILFESL on FRED are seasonally adjusted index levels, not the 12 month percent in a news release. The Bureau of Labor Statistics states the all items change over the last 12 months before seasonal adjustment. Use the release for the percent, and the FRED ID when you need the index. PCEPI and PCEPILFE are the chain type PCE price indexes. How CPI and PCE differ in coverage, weights, and formula is the subject of CPI versus PCE. A map of the wider idea is the inflation topic. Habits for reading a release are in the data guides.

United States: CPI, PCE, and core PCE

US readers meet two agencies and four widely quoted series. The Bureau of Labor Statistics publishes CPI for all items and CPI for all items less food and energy. The Bureau of Economic Analysis publishes the PCE price index and the PCE price index excluding food and energy. Primary pages are the BLS CPI site and the BEA PCE price index. The matching FRED series are CPIAUCSL, CPILFESL, PCEPI, and PCEPILFE.

The Federal Reserve longer run goal is an annual increase of 2 percent in the PCE price index, not in CPI. The Fed FAQ on how policymakers evaluate inflation says the Federal Open Market Committee uses the PCE price index largely because it covers a wide range of household spending, and that policymakers also track consumer price indexes from the Department of Labor. The same FAQ says they examine core measures to help identify the trend. The most common of those measures leave out food and energy, because a large move there is not necessarily followed by another large move in the same direction. The BEA page for PCE excluding food and energy says that core index is closely watched by the Federal Reserve and that leaving out those two categories makes the underlying trend easier to see. That series is core PCE. It is a trend lens paired with the goal index. The goal itself remains overall PCE.

Markets, contracts, and many news lines still quote CPI. Before comparing two numbers, name the agency, say whether the index is CPI or PCE, and say whether the figure is all items or a core aggregate. A real rate built from one of those indexes is a different question, covered in real interest rates.

United Kingdom: CPI, CPIH, and a wider exclusion

The Bank of England says the government has set an inflation target of 2 percent, and that CPI is the measure it targets. That is the all items CPI, not a core variant and not CPIH. The Bank explains the target on its page Inflation and the 2 percent target. If CPI is more than 1 percentage point away from 2 percent, the Governor writes to the Chancellor.

ONS publishes both CPI and CPIH. CPIH includes owner occupiers' housing costs. In the August 2026 consumer price inflation bulletin, ONS says this makes CPIH its most comprehensive measure of inflation. ONS also publishes CPI and CPIH excluding energy, food, alcohol and tobacco, and it refers to the CPI version as core CPI. Treat that as a cousin of US core CPI or core PCE. The idea, looking through volatile prices, is shared. The basket is not. US core drops food and energy and keeps alcohol and tobacco. The ONS exclusion drops those as well. Start from the ONS hub for inflation and price indices, then open the bulletin for the month you mean.

A published month: August 2026

Read the US CPI rows as one story. Energy rose 16.3 percent over those 12 months, food rose 2.7 percent, all items rose 3.4 percent, and all items less food and energy rose 2.4 percent. Food was close to the all items rate. Energy was not. That is why headline sat above core in that release. The same BLS release says the gasoline index rose 3.9 percent in August and accounted for more than one third of the monthly all items increase. That monthly fact is separate from the 12 month gap.

The UK rows need the same care. ONS reported CPI at 3.1 percent and CPI excluding energy, food, alcohol and tobacco at 2.6 percent. It also said transport, particularly motor fuels, made the largest upward contribution to the change in the CPI and CPIH annual rates between July and August 2026. That sentence is about the rise from the July annual rate to the August annual rate. It is not an official weight for the whole gap between headline and core.

When headline and core diverge

Headline and core can move apart for months. Three patterns show up often. The August 2026 releases above are one real case of the first pattern. They are not a template for the next print.

• Energy spike, softer core. Oil, gas, or motor fuel prices surge. The all items rate rises by more than the core rate if the rest of the basket is calmer. In the BLS figures for the 12 months ending August 2026, energy rose 16.3 percent, all items rose 3.4 percent, and all items less food and energy rose 2.4 percent. Core was lower than headline. It was not zero. A 2.4 percent core CPI rate is also not the same object as the 2 percent PCE goal.
• Energy drop, sticky core. Energy prices fall and the all items rate can cool while core stays higher, if shelter, insurance, or other services keep rising. The August 2026 US energy index was up over the year, so that release is not this pattern. The pattern is still worth naming, because a later fall in energy can close a headline gap without a similar fall in core.
• Food shocks. A large food move can pull the all items rate without rewriting categories other than food, especially when the shock is global rather than a domestic wage story. In the August 2026 BLS release, food rose 2.7 percent over the year, near the all items rate of 3.4 percent, so food was not the main reason headline sat above core that month.

When headline and core disagree, name the categories that moved and ask whether the gap looks temporary. Neither rate is the single true inflation rate in an absolute sense.

How to read an energy spike

Energy is both a consumer price and an input cost. A petrol or gasoline jump hits headline CPI or CPIH directly. Firms may later pass some of that cost into other prices. That pass through is not automatic. Demand, competition, and wage setting all matter. Monetary policy cannot set the oil price. It can matter for whether a one time jump in the price level turns into ongoing inflation in the rest of the basket.

Useful habits when the two rates disagree:

• Separate a one time jump in the price level from ongoing inflation. A year over year rate stays high until the jump drops out of the twelve month window, even if monthly energy prices have already calmed.
• Check whether core, and services inside core, keep rising after energy calms. In the August 2026 BLS release the shelter index, which sits inside core CPI, rose 0.3 percent in August after 0.1 percent in July, on the seasonally adjusted monthly comparison in that release.
• Watch base effects. A high energy reading from a year earlier can pull this year's 12 month rate down when it leaves the window, with no new collapse in prices this month.
• Prefer a BLS, BEA, ONS, or FRED chart that names the series. CPIAUCSL, CPILFESL, PCEPI, and PCEPILFE are the US index codes. The percent you quote should still come from the release, or from a transformation you can describe.

What core still misses

Dropping food and energy does not make core a finished trend meter. Airfares, used cars, and apparel can still swing inside core. Shelter and other services often carry a large weight in US core CPI, so core can stay firm because of housing even when some goods prices have eased. The August 2026 shelter move above is one month, not a law. Households still pay the food and energy bills that core leaves out. The Fed FAQ says those items are an important part of the budget for most households, and that policymakers ultimately seek to stabilize overall consumer prices.

A lower core month does not by itself prescribe a lower policy rate. A higher headline print does not by itself prescribe a higher one. The stance depends on the outlook for demand, the labour market, and inflation expectations. How the tools fit together, at a high level, is the monetary and fiscal policy topic.

Targets, trend measures, and what they are not

Central banks care about inflation returning to the stated goal in a sustainable way. Headline is what the goal is defined on: PCE in the United States, CPI in the United Kingdom. Core and related trend measures help officials judge whether a recent move looks temporary. Speeches often discuss both, plus slack and expectations. The Phillips curve is the short run link people draw between unemployment and inflation. It is not a core price index. The Taylor rule is a classroom way to map an inflation gap and a resource gap into a suggested policy rate. It is a teaching device, not a trading rule and not a description of the next decision.

When you hear a policy line, note which index is the target, whether the quoted rate is headline or core, and which window is used. That labeling helps you follow the debate. It does not tell you how to invest. For a purchasing power illustration from numbers you type, use the inflation adjuster. It does not download a live index.

What these measures do not tell you

Headline and core summarise average prices in defined baskets. They do not measure every household's personal inflation equally, and they do not name the right policy rate. A single print does not prescribe trades, wage demands, or budget choices. Open the current release from the Bureau of Labor Statistics, the Bureau of Economic Analysis, the Federal Reserve, or ONS before repeating a figure from this page. The August 2026 rates above were the latest CPI, PCE, and UK consumer price bulletins when this page was updated on 9 October 2026.

Common questions

What is the difference between headline and core inflation?

Headline inflation is the change in a broad consumer price index that includes all items, including food and energy. Core inflation is built from the same price data with selected volatile categories removed. In the United States, the Bureau of Labor Statistics publishes the Consumer Price Index for all items and for all items less food and energy, and the Bureau of Economic Analysis publishes the personal consumption expenditures price index with the same food and energy split. In the United Kingdom, the Office for National Statistics publishes CPI and CPIH, plus versions that exclude energy, food, alcohol and tobacco. The split is a way to read which moves look noisy and which look more persistent. It is not a claim that food and energy do not matter. This page is educational only. It is not investment advice.

Why exclude food and energy?

The Federal Reserve FAQ on how policymakers evaluate inflation says the most common core measures leave out items that tend to go up and down in price dramatically or often, such as food and energy. A large price change in those items in one period does not necessarily tend to be followed by another large change in the same direction. Policy works with a lag, so officials try to tell a temporary move from one that is likely to persist. The same FAQ says food and energy make up an important part of the budget for most households, and that policymakers ultimately seek to stabilize overall consumer prices. Core is a lens for the trend. The all items rate is still the rate households meet.

Is core inflation better than headline?

No single measure is better for every question. Headline is the broad rate. It is the rate in the Bank of England target, which is 2 percent on CPI, and it is the rate in the Federal Reserve longer run goal, which is 2 percent on the PCE price index. Core is more useful when food or energy is swinging hard enough to hide the rest of the basket. The Federal Reserve says it examines core measures to help identify inflation trends, and it still seeks stable overall prices. A lower core reading does not by itself call for a lower policy rate, and a higher headline reading does not by itself call for a higher one.

What is core PCE versus core CPI?

Core CPI is the Bureau of Labor Statistics index for all items less food and energy. On FRED, the seasonally adjusted index level is series CPILFESL. Core PCE is the Bureau of Economic Analysis personal consumption expenditures price index excluding food and energy. On FRED, that index is series PCEPILFE. Both drop food and energy, and they are not the same basket. CPI and PCE differ in who is covered, how weights are set, and which formula combines prices. The Federal Reserve longer run goal is 2 percent on the PCE price index, not on CPI. The Fed FAQ says policymakers examine core measures when judging whether a move is likely to last.

How does the UK measure core style inflation?

The Office for National Statistics publishes the Consumer Prices Index (CPI) and CPIH, which is CPI including owner occupiers' housing costs. In its August 2026 bulletin, ONS describes CPIH as its most comprehensive measure of inflation. The Bank of England says CPI is the measure in its target, and that the government has set that target at 2 percent. For a core style reading, ONS publishes CPI and CPIH excluding energy, food, alcohol and tobacco. That list is wider than the usual US core definition, which removes food and energy and leaves alcohol and tobacco in the basket. In the 12 months to August 2026, ONS reported CPI at 3.1 percent and CPI excluding energy, food, alcohol and tobacco at 2.6 percent. CPIH was 3.3 percent, and CPIH with the same exclusion was 2.9 percent. That bulletin was released on 16 September 2026.

Does core leave out what households feel?

Yes. Food and energy remain in household budgets when a core statistic leaves them out. The Federal Reserve FAQ says those items are an important part of the budget for most households. A jump in petrol or grocery prices can move the all items rate, which is the rate people meet, while core moves less. Core can also miss swings in items it still includes, such as airfares, used cars, and shelter. In the Bureau of Labor Statistics release for August 2026, the energy index rose 16.3 percent over the 12 months ending August, the food index rose 2.7 percent, all items rose 3.4 percent, and all items less food and energy rose 2.4 percent. Core did not include that energy rise. It is a trend lens, not a substitute for the cost of living.

Sources

• US Bureau of Labor Statistics, Consumer Price Index
• US Bureau of Labor Statistics, Consumer Price Index news release, August 2026 (11 September 2026)
• US Bureau of Economic Analysis, Personal Consumption Expenditures price index
• US Bureau of Economic Analysis, PCE price index excluding food and energy
• US Bureau of Economic Analysis, Personal Income and Outlays, August 2026 (30 September 2026)
• FRED, Consumer Price Index for all urban consumers, all items (CPIAUCSL)
• FRED, Consumer Price Index for all urban consumers, all items less food and energy (CPILFESL)
• FRED, Personal consumption expenditures price index (PCEPI)
• FRED, Personal consumption expenditures excluding food and energy (PCEPILFE)
• Federal Reserve, What is inflation, and how does the Federal Reserve evaluate changes in the rate of inflation?
• ONS, Inflation and price indices
• ONS, Consumer price inflation, UK: August 2026 (released 16 September 2026)
• Bank of England, Inflation and the 2 percent target