India's Wholesale Price Index has been running hot: 9.87% year-on-year in June 2026, up from 9.68% in May, on an All-Commodities index of 110.2. What makes the June print worth sitting with is where it comes from. Fuel & Power inflation was 27.41%. Primary Articles were 7.00%, Manufactured Products 7.48%. The Office of the Economic Adviser names the drivers explicitly: mineral oils (petroleum products), food articles, basic metals, and chemicals.

That split is the whole argument of this blog's earlier fertiliser-and-fuel work, and the long record now confirms it more sharply than the short window did.

Three corrections we owe our own earlier posts

The rebasing, and why you cannot just draw one long line

WPI was rebased from 2011-12 to 2022-23 inside this window. Both series are published, and they overlap:

Their levels are not splice-able: a rebasing resets the index to 100 on a new basket with new weights, so joining 161.2 (old base, March 2026) to 104.6 (new base, same month) would draw a cliff that does not exist in prices. Their inflation rates are comparable, because a percentage change is basket-relative. That is the honest way to read across the break, and it is why the tables below report the two bases separately rather than pretending to one continuous series.

Fourteen years, April to April, on the 2011-12 base

April anchors avoid seasonality and line up with the fiscal year. Index values, base 2011-12 = 100:

Two things jump out of that grid. The first is the violence of the diesel line: 111.9 in 2012, down to 59.1 in April 2016 in the oil-price collapse, back to 200.3 by April 2026. Fuel & Power as a whole swings almost as hard (106.3 → 78.3 → 181.7). Wholesale fuel prices in India are a near-undamped transmission of world crude, and because fuel is itself a component of WPI, that transmission is closer to accounting than to causation.

The second is the flatness of the urea line. Across fourteen years spanning the 2021–22 and 2023 global fertiliser shocks, urea moved from 101.4 to 115.4 — +13.8% in total, less than 1% a year. Nothing in the world market reaches the Indian wholesale urea price, because the subsidy regime absorbs it. DAP, whose subsidy share is smaller and less consistent, sits in between at +41.9%. This is the clearest single illustration in Indian price data of what an administered price actually does: it does not soften a shock, it detaches from it.

The doubling test: 72 divided by the rate

“All commodities up 60%” reads like a lot until you divide it by fourteen years. The quickest yardstick is the rule of 72: divide 72 by an annual growth rate and you get the years a price takes to double. At 7% a year that is 72 ÷ 7 = 10.3 years — a doubling inside a working decade. A series sitting at 104.7 in April 2012 and running at 7% would have passed 209.4 around mid-2022 and would stand at roughly 2.6× its start, or 157.9% higher, by April 2026.

Nothing here did that. Not one of the eight series doubled in fourteen years. Applying the same rule to the pace each series actually managed — 72 divided by its compound annual rate — gives the year each one doubles if it simply carries on:

Two series came close to doubling without reaching it. Food Articles needed 212.4 and reached 201.4 — 94.8% of the way. Primary Articles needed 214.2 and reached 202.5, or 94.5%. Diesel, the series this blog writes about most, needed 223.8 and reached 200.3: 89.5%, and a full 88 index points below where 7% would have put it. The headline “diesel up 79%” is therefore a story about a price compounding at 4.25% a year — 72 ÷ 4.25 ≈ 17 years to double — not one that ran away.

At the other end, urea is not slow, it is nearly stationary. At 0.93% a year, 72 ÷ 0.93 is 77 years, a doubling date in the 2080s. It sits 146 index points below the 7% path, the widest gap in the table, and the reason is not market weakness but the subsidy regime described above. The all-commodities index itself grew at less than half the 7% benchmark, which pushes its doubling from 2022 out to about 2033: eleven years late.

The calm is an average, not a description of today

Every rate in the table above is a fourteen-year average, and averaging is exactly what hides the shape of this series. What the WPI actually did over these fourteen years was sit still for a decade and then move sharply. Reading the average as the current condition is the single most common mistake made with this dataset.

The 2011-12 base makes the break visible if you split it at 2020. April 2012 to April 2020 is eight years; April 2020 to April 2026 is six:

Diesel is the clearest case. Over the first eight years its wholesale index fell 4.72% a year — 111.9 in April 2012 down to 76.0 in April 2020, a collapse driven by the 2015–16 crude slump and the April 2020 demand shock. Over the last six it has compounded at 17.53%. The 4.25% fourteen-year average is not a description of either period; it is the arithmetic of one going down and the other going up. Fuel & Power does the same thing, from −2.09% to +12.46%.

Applying the rule of 72 to what is actually happening now gives a completely different picture from the fourteen-year table. At June 2026's rates, diesel doubles in 2.2 years and Fuel & Power in 2.6 — against 16.9 and 18.5 years on the long average. All commodities double in 7.3 years rather than 21.1. Where the long view said “nothing doubled and nothing will before the 2030s”, the current pace says three of these eight series double before 2030.

Two things resist the turn. Food Articles is the only series that barely changed character, 4.80% then 4.52% — it was never calm, and it has not accelerated. Urea is the only one still flat: 1.10% then 0.70%, and +1.09% in the latest print. Everything else in this table was quiet and is not anymore.

How to read the two tables together. The fourteen-year table answers “how much have wholesale prices risen since 2012” — and the honest answer is less than a doubling, for every series. It does not answer “what is happening to prices now”. For that, use the split above or the current-base table below. Quoting 3.42% all-commodities in a sentence about 2026 would be wrong by a factor of three.

Where things stand on the current 2022-23 base

June 2026, index and year-on-year rate (YoY computed from the index and cross-checked against the published release):

The new base tells the same story with fresher numbers, and in one respect a starker one: since April 2023, wholesale urea has actually fallen 3.2% in index terms while diesel rose 22.5% and the all-commodities index rose 11.3%. Urea is not merely insulated from the general price level; on the current base it has been moving against it.

Also worth noting for anyone citing the June figure: it is a provisional estimate, compiled at an 82.6% weighted response rate. April 2026's final estimate was revised from 108.8 to 108.9, nudging its inflation rate from 8.26% to 8.36%. Provisional WPI prints move.

Sources: Office of the Economic Adviser, DPIIT, Ministry of Commerce & Industry — monthly WPI index files for base 2011-12 (Apr 2012–Apr 2026) and base 2022-23 (Apr 2023–Jun 2026), retrieved from eaindustry.nic.in on 5 August 2026; and the WPI press release for June 2026 (embargoed to 14 July 2026), which supplied the published inflation rates used to validate the computed ones. Cumulative changes are computed from the published index levels; year-on-year rates are the index over its value twelve months earlier. Next release: 14 August 2026, for July 2026. No figure on this page has been estimated, interpolated or extrapolated.

About this article: Researched, written and edited by Umashankar Triplicane Dwarakanathan, with AI research assistance; every figure is meant to trace to the primary source cited. See the Editorial Policy for how sourcing, AI use and corrections work.