Barrel

A barrel, equal to 42 US gallons or about 159 litres, is the basic volume unit used across global crude oil and refined products trading. Production rates, refinery throughput, export programmes, tanker sizes, and inventory levels are almost always expressed in barrels, giving traders a common language to compare markets and opportunities. Benchmark futures contracts such as Brent and WTI are specified in barrels per contract, and physical cargo sizes are described by the number of barrels loaded on a vessel. When a trader analyses refinery margins, they convert both crude input and product output into barrels so that returns can be compared on a consistent basis. Freight calculations also use barrels to translate between tonnes and volume when assessing cost per barrel delivered. Even in cross-commodity strategies, such as gas-to-oil switching, prices are often converted back to a per-barrel equivalent to see which fuel is more competitive. Understanding the barrel as the standard unit is fundamental for any energy trader building balances, pricing deals, or modelling global flows.