Index Numbers of Wholesale Price in India for the Month of March, 2026 (Base Year: 2011-12)

1. At a Glance

WPI measures the price change of goods traded in bulk between businesses, compiled by the Office of the Economic Adviser, DPIIT, Ministry of Commerce & Industry; current base year 2011-12=100 [S1][S3].
For March 2026, headline WPI inflation rose to 3.88% (provisional) Y-o-Y, up sharply from 2.13% in Feb-26 and 1.68% in Jan-26 [S1][S2].
High Prelims yield: weights of the three major groups, base year, releasing ministry, and divergence from CPI are standard MCQ fodder.

PIB release dated 15 April 2026 pegged March WPI inflation at a multi-month high of 3.88%, exceeding market expectation of ~3% [S1][S2].
Surge driven by crude petroleum & natural gas, other manufacturing, non-food articles, basic metals and food articles [S1].
Government has also notified that WPI base year will be revised from 2011-12 to 2022-23, with the new series scheduled for release on 15 June 2026 [S4].

WPI first compiled in India for the week ending 10 Jan 1942 (base 1939=100).
Successive base-year revisions: 1952-53 → 1961-62 → 1970-71 → 1981-82 → 1993-94 → 2004-05 → 2011-12 (current, effective May 2017) [S3].
The 2011-12 series adopted Abhijit Sen Committee recommendations: dropped indirect taxes, expanded item basket to 697 items (199 added, 146 dropped), and aligned manufactured product groups to NIC-2008 (12 → 22 two-digit groups) [S3].
Next revision: base 2022-23, releasing 15 June 2026 [S4].

Releasing body: Office of the Economic Adviser, Department for Promotion of Industry and Internal Trade (DPIIT), Ministry of Commerce & Industry [S3].
Base year: 2011-12 = 100 (current); revised series 2022-23 from June 2026 [S3][S4].
Release schedule: 14th of every month (or next working day), with two-week lag [S3].
Three Major Groups & weights [S3]:
Primary Articles — 22.62%
Fuel & Power — 13.15%
Manufactured Products — 64.23%
Items in basket: 697 [S3].
March 2026 readings (provisional) [S1]:
All Commodities Index: 160.8; Inflation 3.88%
Primary Articles: 197.3; Inflation 6.36%
Fuel & Power index rose to 153.7 (+4.13% M-o-M) [S1]
M-o-M change in All-Commodities WPI: +1.64% [S1]
Statutory base: WPI is administratively compiled (no specific Act); used by RBI, Finance Commission and CSO for GDP deflator computation.

Economic
WPI is a producer-side price gauge; sustained acceleration to 3.88% signals cost-push pressure on downstream CPI [S1].
Crude & natural gas, basic metals reflect imported inflation from global energy/commodity cycles [S1].
Monetary Policy
RBI's nominal anchor is CPI (Combined) headline at 4% ±2%, not WPI; but WPI feeds into GDP deflator and IIP-deflator nowcasts.
Wide CPI-WPI divergence complicates real interest rate calculations.
Administrative / Statistical
Switch to GVA-style WPI in 2017 (excluding indirect taxes) brought it closer to a Producer Price Index (PPI) but India has not yet adopted a formal PPI [S3].
Working Group constituted to migrate base to 2022-23 and to launch PPI [S4].
Sectoral
Manufactured Products (64.23% weight) dominate; movement in basic metals & chemicals disproportionately moves headline [S1][S3].

15 Apr 2026: PIB release — March WPI 3.88% [S1].
Feb 2026 (P): 2.13%; Jan 2026 (F): 1.68% — clear upward trajectory [S1].
2026: Cabinet/DPIIT approval of base-year revision; new series 2022-23 to be released on 15 June 2026 [S4].

WPI in India is released by the Office of the Economic Adviser, DPIIT, NOT by MoSPI or RBI [S3].
Current base year: 2011-12 [S1][S3].
Three major groups: Primary Articles, Fuel & Power, Manufactured Products [S3].
Weights: Primary Articles 22.62%, Fuel & Power 13.15%, Manufactured Products 64.23% [S3].
Total items in 2011-12 basket: 697 [S3].
WPI excludes services and excludes indirect taxes (since 2017 revision) [S3].
WPI inflation (March 2026, provisional): 3.88% [S1].
Releasing date typically the 14th of each month with a 2-week lag [S3].
2-digit groups under Manufactured Products aligned with NIC-2008; expanded from 12 to 22 [S3].
Next base year of WPI: 2022-23, effective from 15 June 2026 [S4].
RBI uses CPI (Combined) — not WPI — as monetary policy anchor (Urjit Patel Committee, 2014).
CSO uses WPI as a deflator in computing GDP at constant prices.

GS-III — Indian Economy: "Issues relating to growth, development… inclusive growth and issues arising from it" and "Effects of liberalization on the economy."
Possible stems: 1. "Discuss the limitations of WPI as a measure of inflation in India and examine the case for adopting a Producer Price Index." 2. "Persistent divergence between CPI and WPI complicates monetary policy formulation. Analyse." (250 words) 3. "Examine the rationale for revising the base year of macro-statistical indices such as WPI and IIP."

CPI (Combined, Rural, Urban) — MoSPI, base 2012=100; RBI's policy anchor.
Producer Price Index (PPI) — proposed Indian successor to WPI.
Industrial Production Index (IIP) — base 2011-12, complementary indicator.
GDP deflator — uses WPI; bridge concept.
Monetary Policy Framework Agreement (2015) — sets 4±2% CPI target.
Urjit Patel Committee (2014) — recommended CPI anchor over WPI.
Abhijit Sen Committee — designed 2011-12 WPI series.
Core Inflation — non-food, non-fuel measure.

Confusing releasing ministry: WPI = DPIIT/Commerce & Industry; CPI = MoSPI [S3].
Wrong base year: current is 2011-12, not 2004-05; new 2022-23 series releases June 2026 [S3][S4].
Assuming services are covered — they are not in WPI [S3].
Treating WPI as RBI's policy anchor — it is CPI(C) since 2016.
Confusing weights — Manufactured Products has the highest weight (64.23%), not Primary Articles [S3].

[S1] Index Numbers of Wholesale Price in India for March 2026 — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2252109 — (tier 1)
[S2] WPI January 2026 release (comparative prior month data) — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2228577 — (tier 1)
[S3] Revision of base year of All-India WPI from 2004-05 to 2011-12 (methodology, weights, item basket) — https://www.pib.gov.in/newsite/printrelease.aspx?relid=161741 — (tier 1)
[S4] Base Year of Wholesale Price Index Revised from 2011-12 to 2022-23 — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2267963 — (tier 1)