Gallons measure volume and pounds measure weight, the conversion between them depends entirely on the liquid’s density. This converter uses typical density presets for common liquids to translate gallons into an accurate weight.

How to use this gallons to pounds converter

1. Enter your volume in Gallons.
2. Pick a common Liquid for its typical density, or select Custom density and enter your own.
3. Read the resulting Weight in Pounds and Kilograms.

What this converter does

A gallon of water weighs about 8.34 lb, but a gallon of gasoline weighs only about 6.1 lb, despite occupying the identical volume, because gasoline is considerably less dense than water. This converter applies the correct density for your specific liquid rather than assuming everything weighs the same as water.

Why fuel weighs less than water per gallon

Gasoline (about 6.1 lb/gal) and diesel (about 7.2 lb/gal) are both lighter than water (8.34 lb/gal) for the same volume, reflecting their lower density. Milk, being slightly denser than water, weighs marginally more at about 8.6 lb/gal. These differences matter for anything involving fuel weight calculations, like vehicle payload or shipping weight estimates, where using water’s density for a fuel volume would give an inaccurate result.

Frequently asked questions