Gallons To Pounds
Convert US gallons to pounds by substance. Free volume-to-weight converter with density presets for water, milk, oil, honey, gasoline, diesel, and more liquids.
About This Calculator
Our free gallons to pounds converter helps you instantly convert any volume in US gallons to its equivalent weight in pounds. Whether you are calculating how much your aquarium weighs, figuring out the weight of a 5-gallon water jug, scaling a recipe, or working on a shipping estimate, this tool supports water, milk, cooking oil, gasoline, diesel, honey, beer, ice cream, jet fuel, olive oil, orange juice, and paint with built-in density values.
The conversion uses the standard mass-volume-density formula: Mass (lb) = Volume (gal) × Density (lb/gal). One US gallon equals exactly 3.78541 liters. For water at room temperature (75°F / 24°C), the density is 8.35 lb/gal, so 1 gallon weighs 8.35 pounds. At 39.2°F (4°C), water reaches its maximum density of 8.3454 lb/gal. Each substance has a unique density — honey is nearly 12 lb/gal while ice cream is only about 4.67 lb/gal.
Regional Notes
US: US liquid gallons (3.78541 L) are the standard volume unit in the United States. A gallon of water weighs 8.35 lb. This is the gallon used for fuel, milk, and most consumer liquids.
UK: UK imperial gallons are larger at 4.54609 L, so 1 UK gallon of water weighs approximately 10.02 lb. This calculator uses US gallons — multiply UK gallons by 4.54609 L/gal × density in kg/L × 2.20462 lb/kg for imperial results.
India: India uses the metric system (liters, kilograms). 1 US gallon = 3.785 liters. This converter is useful for understanding US product specifications, imported goods, or cooking recipes from American sources.
Frequently Asked Questions
How many pounds are in a gallon of water?
One US gallon of water at room temperature (75°F / 24°C) weighs approximately 8.35 pounds. At 39.2°F (4°C), where water is at its densest, 1 gallon weighs exactly 8.3454 pounds. The weight varies slightly with temperature because water expands as it warms.
How many pounds are in a gallon of milk?
A US gallon of milk weighs approximately 8.64 pounds. Milk is slightly denser than water (density of 1.035 g/mL vs 1.0 g/mL for water), which accounts for the extra weight. Whole milk, 2% milk, and skim milk have similar densities so the weight difference is minimal.
How do you convert gallons to pounds?
To convert gallons to pounds, multiply the volume in US gallons by the density of the substance in pounds per gallon (lb/gal). The formula is: Mass (lb) = Volume (gal) × Density (lb/gal). For water at room temperature, the density is 8.35 lb/gal, so 5 gallons × 8.35 = 41.75 pounds.
How many pounds are in 5 gallons of water?
5 US gallons of water at room temperature weighs approximately 41.75 pounds. This is calculated as 5 gal × 8.35 lb/gal = 41.75 lb. A typical 5-gallon water jug or bucket filled with water weighs about 42 pounds, or roughly 19 kilograms.
How much does a gallon of gasoline weigh in pounds?
One US gallon of gasoline weighs approximately 6.15 pounds. Gasoline is less dense than water (about 0.74 g/mL versus 1.0 g/mL), which is why it floats on water. Diesel fuel is heavier at about 7.09 pounds per gallon.
Is this gallons to pounds converter free to use?
Yes, all calculators on Calculy are completely free to use. No registration, login, or payment is required. You can use this gallons to pounds converter as many times as you need for cooking, shipping, pool maintenance, or any other purpose.
Can I convert UK imperial gallons to pounds?
This calculator uses US gallons (3.78541 L). UK imperial gallons are larger at 4.54609 L. To convert UK gallons to pounds, multiply UK gallons by the density in lb/UK gal. For water, 1 UK gallon weighs about 10.02 pounds (4.54609 L × 1 kg/L × 2.20462 lb/kg).