The signal under the noise.
Food is weather and fuel is geopolitics; neither answers to interest rates. Strip them from the index and what remains is the part of inflation the RBI can actually reach.
The charts on this page draw the consumer price index on its 2012 base, the series that ran to December 2025. From January 2026 the NSO publishes the index on a new base, 2024 = 100. The idea on this page works the same on either ruler; the latest figures are in the Consumer prices guide.
The word, defined
First principlesA bad monsoon lifts food prices. A war in the Gulf lifts fuel prices. A central bank can do nothing about either, yet both land in the inflation number it is judged by. So economists strip them out. What remains, roughly half the index, is core inflation: the part of the price level that answers to demand, wages and interest rates.
The logic is triage, not denial. People still buy food, and food is nearly half the budget. But the central bank's tools work through credit and demand, and the core basket is where those forces show up cleanest. When core is calm, a headline spike will pass. When core is climbing, a calm headline will not last.
A decade of the two lines
y/y %, monthlyThe average and its anchor: core against headline, 2016–2025
The blue line is the headline, the number in the news. The dashed grey line is core: the same measure with food and fuel removed. When the two separate, the volatile half of the basket is doing the talking, and the direction of the gap tells you which way.
Core moves less, and moves late. Across this decade it stayed between – and –, never once reaching the 2 per cent floor of the band even as the headline visited both edges. India's core has a structural floor: administered prices, services and housing costs grind rather than swing.
Through 2025 the headline collapsed, ending the year at –. Core did the opposite: it climbed through the year and closed at –, a wedge of – between the two lines. The average was being held down by volatile items, cheap vegetables above all, while underlying pressure climbed past the 4 per cent target and stayed there.
Read both lines and the year looks different: not inflation beaten, but inflation rearranged. That wedge is the reason this page exists.
A number India does not officially publish
Honesty clauseHere is the part most explainers skip. The National Statistical Office publishes the group indices: food, fuel, clothing, housing and the rest. It publishes no core series. Every Indian core number you have ever seen was computed by someone, whether the RBI's researchers, a bank's economists, a newspaper, or this site.
Ours is built from the published group indices using the official weights, and it is labelled as computed wherever it appears. The recipe is public and the ingredients are official. Know, though, that the dish is assembled, not served.
How to misread this concept
- i.
“Core is the real inflation.”
No. Core is the inflation monetary policy can reach. The real inflation is the one households pay, food included, and food is 45.86 per cent of the budget. Strip the weather out to steer, never to describe.
- ii.
“Core is an official series.”
It is not. The NSO publishes group indices, not a core aggregate; every core number in circulation is computed from them, including the one on this page. That does not make it wrong. It makes the recipe part of the claim.
- iii.
“A low headline means low underlying pressure.”
December 2025 says otherwise: a headline of – with core at –. The calm sat in the volatile half of the basket. The pressure, – above it, had not gone anywhere.