The weight of a 55-gallon oil drum depends on oil density. A 55-gallon drum of crude oil with a density of 790 kilograms per cubic meter would weigh about 188.98 kilograms.

This is calculated by converting cubic meters to gallons, multiplying the result by 55 gallons, and adding the weight of the oil drum, or about 24.5 kilograms. Cubic meters can be converted to gallons by dividing by 264.172 U.S. gallons.

Oils often have different densities that can change by many factors including brand. Furthermore, the density of a substance is affected by both atmospheric pressure and temperature. At higher temperatures, density tends to decrease with the pressure being constant.