Washington, DC…The Consumer Price Index for All Urban Consumers (CPI-U) rose 0.5 percent in January on a seasonally adjusted basis, after increasing 0.1 percent in December, the U.S. Bureau of Labor Statistics reported today. Over the last 12 months, the all items index increased 6.4 percent before seasonal adjustment.

The index for shelter was by far the largest contributor to the monthly all items increase, accounting
for nearly half of the monthly all items increase, with the indexes for food, gasoline, and natural
gas also contributing. The food index increased 0.5 percent over the month with the food at home index
rising 0.4 percent. The energy index increased 2.0 percent over the month as all major energy
component indexes rose over the month.

The index for all items less food and energy rose 0.4 percent in January. Categories which increased
in January include the shelter, motor vehicle insurance, recreation, apparel, and household furnishing
s and operations indexes. The indexes for used cars and trucks, medical care, and airline fares were
among those that decreased over the month.

The all items index increased 6.4 percent for the 12 months ending January; this was the smallest
12-month increase since the period ending October 2021. The all items less food and energy index rose
5.6 percent over the last 12 months, its smallest 12-month increase since December 2021. The energy
index increased 8.7 percent for the 12 months ending January, and the food index increased 10.1
percent over the last year.

Food

The food index increased 0.5 percent in January, and the food at home index rose 0.4 percent over the
month. Four of the six major grocery store food group indexes increased over the month. The index for
other food at home rose 0.7 percent in January. The index for meats, poultry, fish, and eggs increased
0.7 percent over the month, as the index for eggs rose 8.5 percent. The index for cereals and bakery
products rose 1.0 percent over the month, while the index for nonalcoholic beverages increased 0.4
percent in January.

In contrast, the fruits and vegetables index fell 0.5 percent over the month with the fresh vegetables
index declining 2.3 percent. The index for dairy and related products was unchanged in January.

The food away from home index rose 0.6 percent in January, after increasing 0.4 percent in December.
The index for limited service meals increased 0.7 percent over the month and the index for full
service meals increased 0.5 percent. 

The food at home index rose 11.3 percent over the last 12 months. The index for cereals and bakery
products rose 15.6 percent over the 12 months ending in January. The remaining major grocery store
food groups posted increases ranging from 7.2 percent (fruits and vegetables) to 14.0 percent (dairy
and related products).

The index for food away from home rose 8.2 percent over the last year. The index for full service meal
s rose 8.1 percent over the last 12 months, and the index for limited service meals rose 6.7 percent
over the same period. 

Energy

The energy index rose 2.0 percent in January, as the gasoline index increased 2.4 percent over the
month. (Before seasonal adjustment, gasoline prices rose 3.2 percent in January.) The index for
natural gas rose 6.7 percent over the month, and the index for electricity increased 0.5 percent.

The energy index rose 8.7 percent over the past 12 months. The gasoline index increased 1.5 percent
over the span. The fuel oil index rose 27.7 percent over the last 12 months, while the index for
electricity rose 11.9 percent, and the index for natural gas increased 26.7 percent over the same
period.

All items less food and energy

The index for all items less food and energy rose 0.4 percent in January. The shelter index continued
to increase, rising 0.7 percent over the month. The rent index and the owners' equivalent rent index
each rose 0.7 percent since December. The index for lodging away from home increased 1.2 percent in
January. 

The shelter index was the dominant factor in the monthly increase in the index for all items less food
and energy, while other components were a mix of increases and declines. Among the other indexes that
rose in January was the index for motor vehicle insurance, which increased 1.4 percent over the month,
while the index for recreation rose 0.5 percent, and the index for apparel increased 0.8 percent. The
household furnishings and operations index rose 0.3 percent in January, and the communication index
increased 0.4 percent.

The medical care index fell 0.4 percent in January, as the physicians' services index declined 0.1
percent. The index for hospital services increased 0.5 percent over the month and the index for
prescription drugs rose 2.1 percent in January. 

Other indexes which declined over the month include the index for used cars and trucks, which fell 1.9
percent in January, continuing a recent downward trend. The index for airline fares fell 2.1 percent
over the month. 

The index for all items less food and energy rose 5.6 percent over the past 12 months. The shelter
index increased 7.9 percent over the last year, accounting for nearly 60 percent of the total increase
in all items less food and energy. Other indexes with notable increases over the last year include
household furnishings and operations (+5.9 percent), medical care (+3.1 percent), recreation (+4.8
percent), and new vehicles (+5.8 percent). 

Not seasonally adjusted CPI measures

The Consumer Price Index for All Urban Consumers (CPI-U) increased 6.4 percent over the last 12 months
to an index level of 299.170 (1982-84=100). For the month, the index increased 0.8 percent prior to
seasonal adjustment.  

The Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) increased 6.3 percent
over the last 12 months to an index level of 293.565 (1982-84=100). For the month, the index increased
0.9 percent prior to seasonal adjustment.  

The Chained Consumer Price Index for All Urban Consumers (C-CPI-U) increased 6.6 percent over the last
12 months. For the month, the index increased 0.8 percent on a not seasonally adjusted basis. Please
note that the indexes for the past 10 to 12 months are subject to revision. 
_______________
The Consumer Price Index for February 2023 is scheduled to be released on Tuesday, March 14, 2023, at
8:30 a.m. (ET).

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		January 2023 Consumer Price Index Weight Update
Starting with January 2023 data, BLS updated weights annually for the Consumer Price Index 
based on a single calendar year of data, using consumer expenditure data from 2021. This 
reflects a change from prior practice of updating weights biennially using 2 years of 
expenditure data. For more information about the weight update, see 
www.bls.gov/cpi/tables/relative-importance/home.htm
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 		Updated Seasonal Factors Introduced February 10, 2023
Each year with the release of the January CPI, seasonal adjustment factors are recalculated 
to reflect price movements from the just-completed calendar year. This routine annual 
recalculation resulted in revisions to seasonally adjusted indexes for the previous 5 years. 
Recalculated seasonally adjusted indexes as well as recalculated seasonal adjustment factors 
for the period January 2018 through December 2022 were made available on Friday, February 
10, 2023. The revised indexes and seasonal factors are available on 
www.bls.gov/cpi/seasonal-adjustment/home.htm  
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Brief Explanation of the CPI
The Consumer Price Index (CPI) measures the change in prices paid by consumers for goods and services.
The CPI reflects spending patterns for each of two population groups: all urban consumers and urban
wage earners and clerical workers. The all urban consumer group represents over 90 percent of the
total U.S. population. It is based on the expenditures of almost all residents of urban or 
metropolitan areas, including professionals, the self-employed, the poor, the unemployed, and retired
people, as well as urban wage earners and clerical workers. Not included in the CPI are the spending 
patterns of people living in rural nonmetropolitan areas, farming families, people in the Armed Forces,
and those in institutions, such as prisons and mental hospitals. Consumer inflation for all urban
consumers is measured by two indexes, namely, the Consumer Price Index for All Urban Consumers (CPI-U)
and the Chained Consumer Price Index for All Urban Consumers (C-CPI-U). 

The Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) is based on the 
expenditures of households included in the CPI-U definition that meet two requirements: more than 
one-half of the household's income must come from clerical or wage occupations, and at least one of 
the household's earners must have been employed for at least 37 weeks during the previous 12 months.
The CPI-W population represents approximately 30 percent of the total U.S. population and is a subset
of the CPI-U population.

The CPIs are based on prices of food, clothing, shelter, fuels, transportation, doctors' and dentists'
services, drugs, and other goods and services that people buy for day-to-day living. Prices are 
collected each month in 75 urban areas across the country from about 6,000 housing units and 
approximately 22,000 retail establishments (department stores, supermarkets, hospitals, filling 
stations, and other types of stores and service establishments). All taxes directly associated with 
the purchase and use of items are included in the index. Prices of fuels and a few other items are 
obtained every month in all 75 locations. Prices of most other commodities and services are collected 
every month in the three largest geographic areas and every other month in other areas. Prices of most
goods and services are obtained by personal visit, telephone call, or web collection by the Bureau's 
trained representatives.

In calculating the index, price changes for the various items in each location are aggregated using
weights, which represent their importance in the spending of the appropriate population group. Local
data are then combined to obtain a U.S. city average. For the CPI-U and CPI-W, separate indexes are
also published by size of city, by region of the country, for cross-classifications of regions and
population-size classes, and for 23 selected local areas. Area indexes do not measure differences in
the level of prices among cities; they only measure the average change in prices for each area since
the base period. For the C-CPI-U, data are issued only at the national level. The CPI-U and CPI-W are
considered final when released, but the C-CPI-U is issued in preliminary form and subject to three
subsequent quarterly revisions.

The index measures price change from a designed reference date. For most of the CPI-U and the CPI-W,
the reference base is 1982-84 equals 100. The reference base for the C-CPI-U is December 1999 equals
100.  An increase of 7 percent from the reference base, for example, is shown as 107.000. Alternatively,
that relationship can also be expressed as the price of a base period market basket of goods and 
services rising from $100 to $107. 

Sampling Error in the CPI

The CPI is a statistical estimate that is subject to sampling error because it is based upon a sample
of retail prices and not the complete universe of all prices. BLS calculates and publishes estimates
of the 1-month, 2-month, 6-month, and 12-month percent change standard errors annually for the CPI-U.
These standard error estimates can be used to construct confidence intervals for hypothesis testing.
For example, the estimated standard error of the 1-month percent change is 0.03 percent for the U.S.
all items CPI. This means that if we repeatedly sample from the universe of all retail prices using
the same methodology, and estimate a percentage change for each sample, then 95 percent of these
estimates will be within 0.06 percent of the 1-month percentage change based on all retail prices.
For example, for a 1-month change of 0.2 percent in the all items CPI-U, we are 95 percent confident
that the actual percent change based on all retail prices would fall between 0.14 and 0.26 percent.
For the latest data, including information on how to use the estimates of standard error, see
www.bls.gov/cpi/tables/variance-estimates/home.htm. 

Calculating Index Changes

Movements of the indexes from 1 month to another are usually expressed as percent changes rather than
changes in index points, because index point changes are affected by the level of the index in
relation to its base period, while percent changes are not. The following table shows an example of
using index values to calculate percent changes:

 
                            Item A                  Item B                      Item C
Year I                      112.500                 225.000                     110.000
Year II                     121.500                 243.000                     128.000
Change in index points      9.000                   18.000                      18.000
Percent change              9.0/112.500 x 100 = 8.0  18.0/225.000 x 100 = 8.0   18.0/110.000 x 100 = 16.4

Use of Seasonally Adjusted and Unadjusted Data

The Consumer Price Index (CPI) program produces both unadjusted and seasonally adjusted data.
Seasonally adjusted data are computed using seasonal factors derived by the X-13ARIMA-SEATS seasonal
adjustment method. These factors are updated each February, and the new factors are used to revise the
previous 5 years of seasonally adjusted data. The factors are available at
www.bls.gov/cpi/tables/seasonal-adjustment/seasonal-factors-2023.xlsx. 

For more information on data revision scheduling, please see the Factsheet on Seasonal Adjustment at
www.bls.gov/cpi/seasonal-adjustment/questions-and-answers.htm 
and the Timeline of Seasonal Adjustment Methodological Changes at 
www.bls.gov/cpi/seasonal-adjustment/timeline-seasonal-adjustment-methodology-changes.htm. 

How to Use Seasonally Adjusted and Unadjusted Data

For analyzing short-term price trends in the economy, seasonally adjusted changes are usually preferred
since they eliminate the effect of changes that normally occur at the same time and in about the same
magnitude every year - such as price movements resulting from weather events, production cycles, model
changeovers, holidays, and sales. This allows data users to focus on changes that are not typical for
the time of year. 

The unadjusted data are of primary interest to consumers concerned about the prices they actually pay.
Unadjusted data are also used extensively for escalation purposes. Many collective bargaining contract
agreements and pension plans, for example, tie compensation changes to the Consumer Price Index before
adjustment for seasonal variation. BLS advises against the use of seasonally adjusted data in
escalation agreements because seasonally adjusted series are revised annually.

Intervention Analysis

The Bureau of Labor Statistics uses intervention analysis seasonal adjustment (IASA) for some CPI
series. Sometimes extreme values or sharp movements can distort the underlying seasonal pattern of
price change. Intervention analysis seasonal adjustment is a process by which the distortions caused
by such unusual events are estimated and removed from the data prior to calculation of seasonal
factors. The resulting seasonal factors, which more accurately represent the seasonal pattern, are
then applied to the unadjusted data.

For example, this procedure was used for the motor fuel series to offset the effects of the 2009
return to normal pricing after the worldwide economic downturn in 2008. Retaining this outlier data 
during seasonal factor calculation would distort the computation of the seasonal portion of the time
series data for motor fuel, so it was estimated and removed from the data prior to seasonal adjustment.
Following that, seasonal factors were calculated based on this "prior adjusted" data. These seasonal
factors represent a clearer picture of the seasonal pattern in the data. The last step is for motor
fuel seasonal factors to be applied to the unadjusted data.

For the seasonal factors introduced for January 2023, BLS adjusted 57 series using intervention
analysis seasonal adjustment, including selected food and beverage items, motor fuels and vehicles.

Revision of Seasonally Adjusted Indexes

Seasonally adjusted data, including the U.S. city average all items index levels, are subject to 
revision for up to 5 years after their original release. Every year, economists in the CPI calculate
new seasonal factors for seasonally adjusted series and apply them to the last 5 years of data. 
Seasonally adjusted indexes beyond the last 5 years of data are considered to be final and not subject
to revision. For January 2023, revised seasonal factors and seasonally adjusted indexes for 2018 to 
2022 were calculated and published. For series which are directly adjusted using the Census 
X-13ARIMA-SEATS seasonal adjustment software, the seasonal factors for 2022 will be applied to data
for 2023 to produce the seasonally adjusted 2023 indexes. Series which are indirectly seasonally 
adjusted by summing seasonally adjusted component series have seasonal factors which are derived and
are therefore not available in advance.

Determining Seasonal Status

Each year the seasonal status of every series is reevaluated based upon certain statistical criteria.
Using these criteria, BLS economists determine whether a series should change its status from "not
seasonally adjusted" to "seasonally adjusted", or vice versa. If any of the 81 components of the U.S.
city average all items index change their seasonal adjustment status from seasonally adjusted to not
seasonally adjusted, not seasonally adjusted data will be used in the aggregation of the dependent
series for the last 5 years, but the seasonally adjusted indexes before that period will not be
changed. For 2023, 37 of the 81 components of the U.S. city average all items index are not seasonally
adjusted.

Contact Information

For additional information about the CPI visit www.bls.gov/cpi or contact the CPI Information and
Analysis Section at 202-691-7000 or cpi_info@bls.gov. 

For additional information on seasonal adjustment in the CPI visit 
www.bls.gov/cpi/seasonal-adjustment/home.htm

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