Gross Refining Margin (GRM)

What it measures

A refinery buys crude oil and turns it into petrol, diesel, jet fuel and other products. The gross refining margin (GRM) is the difference between the value of all those refined products and the cost of the crude, expressed in US dollars per barrel. It is the single most important profitability gauge for a refiner — more telling than the crude price itself, because a refiner makes money on the *spread*, not on the direction of oil.

The benchmark Indian refiners watch

The global yardstick is the Singapore complex GRM, the reference against which Indian refiners measure themselves. In a recent September quarter the Singapore benchmark reached about $7.6 per barrel, up sharply year on year, with analysts expecting it to average somewhere around $5.5-7 per barrel over the medium term.

For India's oil marketing companies — IOC, BPCL and HPCL — the GRM is the key earnings driver. Reliance Industries consistently earns a premium over the benchmark, thanks to its highly complex Jamnagar refinery, which can process cheaper, heavier crude and squeeze out a more valuable product slate.

A current tailwind

GRMs widen when product prices stay firm while crude gets cheaper. Curbs on Russian oil are expected to lower input costs for Indian refiners in 2026, supporting margins at IOC, BPCL and HPCL. The reverse — crude spiking while pump prices lag, as can happen when retail fuel prices are held steady for political reasons — squeezes the marketing side even as refining holds up.

Why investors track it

If you own an Indian refining or oil-marketing stock, the quarterly GRM tells you more than the headline oil price. A rising benchmark GRM, plus a company-specific premium, points to strong refining earnings; a collapsing GRM signals a tough quarter even if production volumes are healthy. Watch the Singapore benchmark as the market mood, and each company's GRM versus that benchmark as its competitive edge.