CPI-Combined

Also called: All-India Combined CPI, CPI-C, CPI (Combined) · Topic: Inflation and Index Numbers: CPI, WPI, IIP and the Deflator · NCERT: Class 11, Ch 7 "Index Numbers"

Meaning

CPI-Combined (CPI-C) is India's all-India Consumer Price Index. It joins CPI-Rural and CPI-Urban into one index of the retail prices that households pay for a fixed basket of goods and services. The NSO (National Statistics Office, under MoSPI) compiles it every month. Its current base is 2024 = 100, first released on 12 February 2026 [3].

Its year-on-year change is India's headline retail inflation (inflation for all items, including food and fuel). The RBI's 4% ± 2% inflation target is set in terms of this number [5].

• Index: CPI = (Cost of fixed basket in current year ÷ Cost of the same basket in base year) × 100
• Inflation (%) = (Iₜ − Iₜ₋₁₂) ÷ Iₜ₋₁₂ × 100. Here Iₜ is this month's index and Iₜ₋₁₂ is the index for the same month last year [2].

Explanation

How the index is built

• Basket of commodities: a fixed set of goods and services that households usually buy.
• Each item gets a weight, meaning how much it counts in the index. Weights come from a household spending survey. The more of the family budget an item takes, the bigger its weight.

• The 2024 series takes its weights from HCES 2023-24 (Household Consumption Expenditure Survey) [2][3].

• Retail prices: the prices people pay in shops, not the bulk prices traders pay each other.

• The Field Operations Division of the NSS, MoSPI, collects the prices every month [2].

• Coverage (2024 series): 1,465 rural markets and 1,395 urban markets in 434 towns [2].

• It also covers 12 online markets in 12 towns with population above 25 lakh. Online prices are collected weekly [2].
• Administrative data (prices that government bodies already record) is used for rail fares, fuel prices (PPAC), postal charges and mobile subscriber shares (TRAI) [2].

• Price collectors record prices on tablets using CAPI (Computer Assisted Personal Interview). This replaced paper forms [2].

• Formula, in two steps [2]:

• Jevons index (a geometric mean of price relatives) for elementary indices. An elementary index covers one item across many markets.

• Young / modified Laspeyres index for higher-level indices. This is a weighted average of price relatives, like the NCERT family budget method: CPI = ΣWR ÷ ΣW.

• Three reference periods in the 2024 series [2]:

• Index reference period (the period whose index = 100): 2024
• Weight reference period (the survey that gives the weights): HCES 2023-24
• Price reference period (when the base prices were collected): calendar year 2024

Worked example: from index to headline inflation

• CPI-C (2024 = 100) was 104.46 in January 2026 and 101.67 in January 2025 [3].
• Inflation = (104.46 − 101.67) ÷ 101.67 × 100 ≈ 2.74%
• The published figure is 2.75%. The small gap exists because MoSPI works with unrounded index values [3].
• How to read 104.46: a basket that cost ₹100 in 2024 cost about ₹104.46 in January 2026.

Weights: what CPI-C is made of

Group (old 6-group structure)	CPI-C 2012	CPI-C 2024 [2]
Food and beverages	45.86	40.10
Pan, tobacco and intoxicants	2.38	2.99
Clothing and footwear	6.53	6.38
Housing	10.07 (urban only)	11.88
Fuel and light	6.84	5.49
Miscellaneous	28.32	33.15

• Food still has the largest share, but it is smaller than before [2].

• Under the new COICOP 2018 structure, the "Food and beverages" division is 36.75 in 2024. The comparable 2012 figure would be 42.62.

• Why food's share fell: Engel's law

• Incomes rise → families spend a smaller share of their budget on food → services such as health, transport, education and communication gain weight.

• COICOP 2018 (Classification of Individual Consumption According to Purpose, from the UN Statistics Division) makes India's CPI comparable with other countries' CPIs [2].

• Structure: 12 divisions, 43 groups, 92 classes, 162 sub-classes [2][3].

• Bigger basket: weighted items rose from 299 to 358. Goods went from 259 to 308, and services from 40 to 50 [2].

• Rural housing is included for the first time [2].

What makes CPI-C rise or fall

• Food prices have the heaviest effect because food has the biggest weight.

• Example: in January 2026, food inflation (CFPI, the Consumer Food Price Index) was only 2.13%. Garlic (−53%), onion (−29%) and potato (−29%) pulled it down, and this kept headline inflation low [3].

• Fuel, housing rent and services also move the index. Rent is collected from 19,039 dwellings [2].

• Free social transfers are left out, for example free ration grain. The CPI counts only what households actually pay [2].

In India

• Compiler: NSO (MoSPI). MoSPI has released CPI-Rural, CPI-Urban and CPI-Combined since January 2011. The base moved from 2010 = 100 to 2012 = 100 [2], and now to 2024 = 100 [3].
• Latest figure (January 2026): CPI-C inflation 2.75%, Rural 2.73%, Urban 2.77%. The CPI-C index was 104.46 [3].
• Legal anchor: under Section 45ZA of the RBI Act, 1934, the Central Government, in consultation with the RBI, sets the inflation target in terms of the CPI. The target is set once every five years [5].
• Target: 4% CPI-C inflation, with a band of ±2 percentage points (2%–6%) [5].

• Failure: average inflation above 6% or below 2% for three consecutive quarters [5].

• Back series: a linking factor converts old-series values to the new base. The linking factor for CPI-C is 0.5267, worked out from the overlap year 2025 [2].

• Example: an old CPI-C (2012 = 100) value of 190 × 0.5267 ≈ 100.1 on the 2024 base.

• Policy review: the RBI's Discussion Paper on Review of the Monetary Policy Framework (21 August 2025) asks whether the RBI should target headline inflation or core inflation [6].

• Future rebasing: MoSPI plans to revise the base every 3–5 years, depending on when new HCES data is available [2].

Don't confuse with

• CPI-IW (Consumer Price Index for Industrial Workers): the Labour Bureau compiles it, not the NSO. Its base is 2016 = 100 [4]. It is used to revise Dearness Allowance (DA), not to set monetary policy.
• WPI (Wholesale Price Index): it uses wholesale prices (bulk trade between producers and traders) and has no services. The RBI targets CPI-C, not WPI.
• CFPI (Consumer Food Price Index): a food-only index, also compiled by the NSO. Its change is food inflation (2.13% in January 2026) [3]. CPI-C's change is headline inflation.
• CPI-Rural / CPI-Urban: these are the parts that make up CPI-C. Each has its own weights. For example, food's weight in 2024 is 44.80 in Rural and 34.26 in Urban [2].

Prelims Hooks

• Headline retail inflation = year-on-year change in CPI-Combined. The NSO (MoSPI) compiles it, not the Labour Bureau.
• New base 2024 = 100, first released on 12 February 2026. Weights come from HCES 2023-24 [3]. The 2012 series used the 68th NSS round (2011-12).
• RBI target: 4% ± 2% CPI inflation. The Central Government sets it, in consultation with the RBI, under Section 45ZA, once every five years [5]. Trap: the RBI does not set the target alone.
• Food and beverages weight in CPI-C: 45.86 (2012) → 40.10 (2024, old structure), or 36.75 under COICOP [2].
• 2024 series: follows COICOP 2018, has 12 divisions and 358 items, includes rural housing for the first time, and adds online prices [2].
• Formula: Jevons at the elementary level and Young / modified Laspeyres at higher levels [2].

Mains Points

• Why rebasing matters for monetary policy (GS-III):
• The 2012 series gave food about 46% weight → food supply shocks (onion, tomato, pulses) pushed headline inflation up more than today's spending justifies.

• The 2024 base lowers food's weight and adds services, rural housing and online prices [2][3] → the RBI's target now tracks what households actually spend.

• Headline vs core targeting (GS-III):

• The RBI cannot bring down supply-driven food inflation by raising interest rates. This is an argument for targeting core inflation (inflation without food and fuel).
• But food prices shape people's inflation expectations (what they think prices will do next). So dropping food from the target is risky.

• The Section 45ZA framework and the RBI's 2025 review sit at the centre of this debate [5][6].

• Measurement and welfare (GS-II):

• CPI-C leaves out free PDS grain [2] → it shows only the prices households pay, not the value of subsidies they receive in kind.
• This matters when CPI-C is used to judge real wages, poverty lines or how well transfer schemes work.

Related concepts

• Consumer Price Index
• Basket of commodities
• Retail prices
• CPI for Industrial Workers
• CPI for Agricultural Labourers
• CPI for Rural Labourers
• CPI for urban non-manual employees
• CPI-Rural and CPI-Urban
• Consumer Food Price Index

Read more

• The consumer price index family in India