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Pounds to Gallons Converter
Enter a weight in pounds and pick the liquid to find how many US gallons it fills, along with liters, quarts and cubic feet. Use the custom field for any liquid with a known pounds-per-gallon value.
Last updated:
lb
lb/gal
Pounds per US gallon. From specific gravity: SG × 8.345
Enter your values to see the result.
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How to use the Pounds to Gallons Converter
- Enter the weight in pounds.
- Choose the liquid, or pick Custom density and type its lb/gal value.
- Read the volume in US gallons, plus liters, quarts and cubic feet.
- Check the table for other weights of the same liquid.
- Copy the results or download the table as CSV.
Pounds to gallons formula
Pounds measure weight and gallons measure volume, so you divide by the liquid's density in pounds per gallon:
US gallons = pounds ÷ density (lb/gal)
Water weighs about 8.345 lb per US gallon, so 50 lb of water is 50 ÷ 8.345 = 5.99 gallons. Propane is much lighter at roughly 4.2 lb/gal, which is why a "20 lb" grill tank holds only about 20 ÷ 4.2 = 4.76 gallons. Honey is heavier than water, so 60 lb of honey fills just over 5 gallons.
Gallons per pound for common liquids
| Liquid | lb per US gal | Gallons per lb | Gallons in 10 lb | Gallons in 100 lb | kg/L |
|---|---|---|---|---|---|
| Water | 8.345 | 0.1198 | 1.198 | 11.98 | 1 |
| Seawater | 8.55 | 0.117 | 1.17 | 11.7 | 1.025 |
| Milk (whole) | 8.6 | 0.1163 | 1.163 | 11.63 | 1.031 |
| Gasoline | 6.17 | 0.1621 | 1.621 | 16.21 | 0.739 |
| Diesel / heating oil | 7.1 | 0.1408 | 1.408 | 14.08 | 0.851 |
| Kerosene / jet fuel | 6.7 | 0.1493 | 1.493 | 14.93 | 0.803 |
| Ethanol | 6.59 | 0.1517 | 1.517 | 15.17 | 0.79 |
| Propane (liquid) | 4.2 | 0.2381 | 2.381 | 23.81 | 0.503 |
| Vegetable oil | 7.7 | 0.1299 | 1.299 | 12.99 | 0.923 |
| Olive oil | 7.6 | 0.1316 | 1.316 | 13.16 | 0.911 |
| Motor oil | 7.3 | 0.137 | 1.37 | 13.7 | 0.875 |
| Antifreeze (ethylene glycol) | 9.29 | 0.1076 | 1.076 | 10.76 | 1.113 |
| Maple syrup | 11.1 | 0.0901 | 0.901 | 9.01 | 1.33 |
| Honey | 11.85 | 0.0844 | 0.844 | 8.44 | 1.42 |
Typical values near 60 °F. Water is 8.345 lb/gal at its densest (about 39 °F) and about 8.33 lb/gal at room temperature. A UK gallon is 1.201 US gallons, so the same weight fills fewer imperial gallons.
Tips
- Propane is filled by weight, used by volume. Tanks are only filled to about 80% of their volume to leave room for expansion, so a 20 lb cylinder is physically larger than 4.8 gallons.
- Use specific gravity for anything else. Multiply the specific gravity from a safety data sheet by 8.345 to get lb/gal and enter it as a custom density.
- Bulk buying. Syrups, oils and chemicals are often priced per pound; convert to gallons to compare with per-gallon prices or tank capacity.
- Need the opposite? The gallons to pounds converter turns a volume into a weight for shipping or payload checks.
Frequently asked questions
How do you convert pounds to gallons?
Divide the weight in pounds by the liquid's density in pounds per gallon. For water, gallons = pounds ÷ 8.345, so 25 lb of water is about 3 gallons.
How many gallons is 20 lb of propane?
At about 4.2 lb per gallon, 20 lb of propane is roughly 4.7 to 4.8 gallons. That is what a standard grill cylinder holds when full.
How many gallons is 100 lb of water?
100 ÷ 8.345 = about 11.98 US gallons.
How many pounds is a gallon of milk?
Whole milk weighs about 8.6 lb per US gallon, a little more than water, so 8.6 lb of milk is about 1 gallon.
Does temperature change the result?
Yes. Liquids expand as they warm, so each gallon weighs a little less and the same weight takes more gallons. The effect is small for water but large for propane.
How do I use specific gravity instead of lb/gal?
Multiply the specific gravity by 8.345 to get pounds per gallon, then enter it as a custom density. A liquid with specific gravity 1.2 weighs about 10.01 lb/gal.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.
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