Gallons to Pounds Converter

Convert gallons to pounds for water, milk, gasoline, and other liquids based on their specific gravity.

gal
Density input
Weight
41.70 lbs
Volume (gal)
5.00 gal
Volume (L)
18.93 L
Density
8.34 lbs/gal
Weight (lbs)
41.70 lbs
Weight (kg)
18.91 kg

Density can vary with temperature. Values shown are approximate at room temperature.

Converting gallons to pounds

Since gallons measure volume and pounds measure weight, the conversion depends on the liquid's density.

Formula

Pounds=Gallons×Density (lbs/gal)\text{Pounds} = \text{Gallons} \times \text{Density (lbs/gal)}

Common liquid densities

Liquidlbs/gallonkg/liter
Water8.341.00
Milk8.61.03
Gasoline6.30.75
Diesel7.10.85
Honey12.01.44
Cooking oil7.60.91
Maple syrup11.01.32
Olive oil7.60.91

Quick reference for water

GallonsPoundsKilograms
18.343.78
541.718.9
1083.437.8
55458.7208

Why density matters

  • Gasoline is lighter than water, so a gallon weighs less
  • Honey is denser than water, so a gallon weighs more
  • Temperature affects density (warm liquids are typically less dense)

Practical applications

  • Shipping costs: Weight-based pricing requires accurate calculations
  • Vehicle loads: Knowing fuel weight helps calculate payload capacity
  • Recipes: Some recipes specify ingredients by weight, not volume
  • Pool chemicals: Proper dosing requires knowing actual weight