conversions
Pounds to Gallons
Last updated: June 19, 2026
A density-based conversion helper translating mass in pounds (lb) to volume in US gallons (gal) specifically for water. At standard room temperature, one US gallon of water weighs approximately 8.345 pounds, though the actual conversion factor varies for other liquids depending on their specific gravity.
Convert pounds to gallons instantly. Read the conversion answers, the mathematical formula, and browse the reference lookup table.
Quick Answer
Convert pounds to gallons based on water density. One US gallon of water weighs approximately 8.345 pounds.
Pounds to Gallons
Bidirectional Pounds and Gallons Converter
Compute pounds to US gallons based on standard water density.
Bidirectional live updates. Enter a number in either field to convert instantly.
Answer
1 gal
8.345 lb = 1 gal
Pounds to Gallons Reference Table (Water)
| Pounds (lb) | Gallons (gal) | Description |
|---|---|---|
| 1 lb | 0.12 gal | About 15 fluid ounces |
| 5 lb | 0.60 gal | About 4.8 pints |
| 8.345 lb | 1.00 gal | Exactly one gallon of water |
| 10 lb | 1.20 gal | About 1.2 gallons |
| 20 lb | 2.40 gal | About 2.4 gallons |
| 50 lb | 5.99 gal | About 6 gallons |
| 100 lb | 11.98 gal | About 12 gallons |
Examples
8.345 lb
1 gal (water)
How it works
To convert pounds (lb) to US gallons (gal) for water, perform the following calculation:
Formula (Water)
gal = lb ÷ 8.345
Method
Divide the total pounds by 8.345 to find the equivalent volume in gallons.
Understanding Pounds to Gallons Conversions
Converting mass (pounds) to volume (gallons) requires knowing the density of the substance being measured. For freshwater at standard room temperature, one US gallon weighs approximately 8.345 pounds. If you are measuring oil, milk, gasoline, or other fluids, you must account for their specific gravity, as heavier liquids will yield fewer gallons per pound.
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Frequently asked questions
Divide the pounds value by 8.345.
One US gallon of pure water weighs approximately 8.345 pounds (8.3454 lb) at room temperature.
No, this specific conversion is calculated for water. Liquids with different densities will have different conversion factors depending on their specific gravity.
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