"A pint's a pound the World around" said someone.
Quote:
https://www.thecalculatorsite.com › conversions › common › gallons-pounds.php
Gallons to Pounds Converter - The Calculator Site
A US gallon of water at room temperature (70°F or 21°C) weighs around 8.33lb. A gallon of milk weighs around 8.64lb. and a gallon of gasoline weighs around 6.2 lb. 1 2 How many pounds are in a gallon? The weight of a gallon of liquids such as milk, gasoline, liquid propane or beer is dependent upon the density of the liquid.
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Imperial to Metric left as an exercise. Better to compare BTUs.