Consumer Price Index Summary

The Consumer Price Index for All Urban Consumers (CPI-U) increased 0.6 percent 
in January on a seasonally adjusted basis, the U.S. Bureau of Labor Statistics 
reported today. Over the last 12 months, the all items index increased 7.5 
percent before seasonal adjustment.

Increases in the indexes for food, electricity, and shelter were the largest 
contributors to the seasonally adjusted all items increase. The food index rose 
0.9 percent in January following a 0.5-percent increase in December. The energy 
index also increased 0.9 percent over the month, with an increase in the 
electricity index being partially offset by declines in the gasoline index 
and the natural gas index.

The index for all items less food and energy rose 0.6 percent in January, the 
same increase as in December. This was the seventh time in the last 10 months 
it has increased at least 0.5 percent. Along with the index for shelter, the 
indexes for household furnishings and operations, used cars and trucks, medical 
care, and apparel were among many indexes that increased over the month.  

The all items index rose 7.5 percent for the 12 months ending January, the 
largest 12-month increase since the period ending February 1982. The all items 
less food and energy index rose 6.0 percent, the largest 12-month change since 
the period ending August 1982. The energy index rose 27.0 percent over the last 
year, and the food index increased 7.0 percent. 


 Table A. Percent changes in CPI for All Urban Consumers (CPI-U): U.S. city
 average

                                  Seasonally adjusted changes from
                                          preceding month
                                                                          Un-
                                                                       adjusted
                                                                        12-mos.
                              July  Aug.  Sep.  Oct.  Nov.  Dec.  Jan.   ended
                              2021  2021  2021  2021  2021  2021  2022   Jan.
                                                                         2022

 All items..................    .5    .3    .4    .9    .7    .6    .6      7.5
  Food......................    .7    .4    .9    .9    .8    .5    .9      7.0
   Food at home.............    .6    .4   1.2    .9    .9    .4   1.0      7.4
   Food away from home (1)..    .8    .4    .5    .8    .6    .6    .7      6.4
  Energy....................   1.6   1.9   1.2   3.7   2.4    .9    .9     27.0
   Energy commodities.......   2.4   2.5   1.2   4.7   4.2   1.3   -.6     39.9
    Gasoline (all types)....   2.5   2.5   1.1   4.6   4.5   1.3   -.8     40.0
    Fuel oil (1)............    .6  -2.1   3.9  12.3   3.5  -2.4   9.5     46.5
   Energy services..........    .7   1.2   1.2   2.4    .2    .3   2.9     13.6
    Electricity.............    .2   1.0    .6   1.4    .2    .5   4.2     10.7
    Utility (piped) gas
       service..............   2.2   1.6   2.9   5.9    .3   -.3   -.5     23.9
  All items less food and
     energy.................    .3    .2    .3    .6    .5    .6    .6      6.0
   Commodities less food and
      energy commodities....    .4    .4    .3   1.1    .9   1.2   1.0     11.7
    New vehicles............   1.5   1.2   1.3   1.3   1.2   1.2    .0     12.2
    Used cars and trucks....    .0  -1.2   -.5   2.5   2.4   3.3   1.5     40.5
    Apparel.................    .1    .3   -.7    .6    .7   1.1   1.1      5.3
    Medical care
       commodities (1)......    .2   -.2    .3    .6    .1    .0    .9      1.4
   Services less energy
      services..............    .3    .1    .2    .4    .4    .3    .4      4.1
    Shelter.................    .4    .2    .4    .5    .5    .4    .3      4.4
    Transportation services    -.9  -1.2  -1.0    .2    .7    .0   1.0      5.6
    Medical care services...    .2    .2    .2    .4    .3    .3    .6      2.7

   1 Not seasonally adjusted.


Food

The food index increased 0.9 percent in January. The food at home index increased 
1.0 percent over the month after rising 0.4 percent in December. Five of the six 
major grocery store food group indexes increased in January. The index for cereals 
and bakery products increased the most, rising 1.8 percent over the month. The 
index for other food at home increased 1.6 percent in January, while the index 
for dairy and related products rose 1.1 percent. The fruits and vegetables index 
rose 0.9 percent over the month, and the meats, poultry, fish, and eggs index 
increased 0.3 percent. The only grocery store group index not to increase in 
January was the index for nonalcoholic beverages, which was unchanged.

The food away from home index rose 0.7 percent in January following an increase 
of 0.6 percent in December. The index for full service meals and the index for 
limited service meals both also rose 0.7 percent over the month.

The food at home index rose 7.4 percent over the last 12 months. All of the six 
major grocery store food group indexes increased over the period. By far the 
largest increase was that of the index for meats, poultry, fish, and eggs, which 
rose 12.2 percent over the year. The index for dairy and related products 
increased 3.1 percent, the smallest 12-month increase among the groups.  

The index for food away from home rose 6.4 percent over the last year, the largest 
12-month increase since January 1982. The index for limited service meals rose 8.0 
percent over the last 12 months, and the index for full service meals rose 7.1 
percent. The index for food at employee sites and schools, in contrast, declined 
46.9 percent over the past 12 months, reflecting widespread free lunch programs.

Energy

The energy index increased 0.9 percent in January. The electricity index rose 
sharply in January, increasing 4.2 percent. The gasoline index fell 0.8 percent 
in January after rising rapidly in the autumn of 2021. (Before seasonal adjustment, 
gasoline prices rose 0.1 percent in January.) The index for natural gas also 
declined in January, falling 0.5 percent after declining 0.3 percent in December. 

The energy index rose 27.0 percent over the past 12 months with all major energy 
component indexes increasing. The gasoline index rose 40.0 percent over the last 
year, despite declining in January. The index for natural gas rose 23.9 percent 
over the last 12 months, and the index for electricity rose 10.7 percent.

All items less food and energy

The index for all items less food and energy rose 0.6 percent in January, the 
same increase as December. The shelter index increased 0.3 percent in January as 
the rent index increased 0.5 percent and the owners’ equivalent rent index rose 
0.4 percent. The index for household furnishings and operations rose 1.3 percent 
over the month following a 1.1-percent increase in December. The used cars and 
trucks index rose 1.5 percent in January, a deceleration from the 3.3-percent 
increase reported in December.

The medical care index rose 0.7 percent in January. The index for hospital 
services increased 0.5 percent and the index for prescription drugs rose 1.3 
percent, while the index for physicians’ services declined 0.1 percent. Other 
indexes that rose in January include recreation (+0.9 percent), apparel (+1.1 
percent), personal care (+1.0 percent), airline fares (+2.3 percent), and 
education (+0.2 percent).

Only a few indexes decreased in January; among those that did were lodging away 
from home (-3.9 percent) and wireless telephone services (-0.1 percent). The 
index for new vehicles was unchanged over the month.

The index for all items less food and energy rose 6.0 percent over the past 12 
months. Major contributors to this increase include shelter (+4.4 percent) and 
used cars and trucks (+40.5 percent). However, the increase is broad-based, with 
virtually all component indexes showing increases over the past 12 months. 

Not seasonally adjusted CPI measures

The Consumer Price Index for All Urban Consumers (CPI-U) increased 7.5 percent 
over the last 12 months to an index level of 281.148 (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 8.2 percent over the last 12 months to an index level of 276.296 
(1982-84=100). For the month, the index rose 0.9 percent prior to seasonal 
adjustment.  

The Chained Consumer Price Index for All Urban Consumers (C-CPI-U) increased 7.1 
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 2022 is scheduled to be released on Thursday, 
March 10, 2022 at 8:30 a.m. (ET).


Technical Note

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 about 93 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 about 29 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 
https://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) 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-2022.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. 

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 2022, BLS adjusted 70 series using intervention 
analysis seasonal adjustment, including selected food and beverage items, motor fuels, electricity, 
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 2022, revised seasonal factors and seasonally adjusted indexes 
for 2017 to 2021 were calculated and published. For series which are directly adjusted using the 
Census X-13ARIMA-SEATS seasonal adjustment software, the seasonal factors for 2021 will be applied 
to data for 2022 to produce the seasonally adjusted 2022 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 2022, 36 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 or contact the CPI seasonal adjustment section at 
202-691-6968 or cpiseas@bls.gov. 

Information from this release will be made available to sensory impaired individuals upon request. 
Voice phone: 202-691-5200; Federal Relay Service: 1-800-877-8339.