Gallons to Pounds Calculator
Convert US gallons to pounds using liquid density. Water weighs approximately 8.345 pounds per gallon at room temperature. Other liquids have different weights per gallon depending on their density.
How to Convert Gallons to Pounds
- Identify the liquid and its weight per gallon (lbs/gal).
- Multiply the number of gallons by the weight per gallon.
- The result is the weight in pounds.
Formula
Pounds = Gallons x Weight per Gallon (lbs/gal)
For water: Pounds = Gallons x 8.345
Example Calculation
How much does 10 gallons of water weigh?
Weight = 10 gal x 8.345 lbs/gal = 83.45 lbs
How much does 15 gallons of gasoline weigh?
Weight = 15 gal x 6.3 lbs/gal = 94.5 lbs
Gallons to Pounds Reference Table
| Substance | lbs/gallon | 5 gal (lbs) | 10 gal (lbs) |
|---|---|---|---|
| Water | 8.345 | 41.7 | 83.5 |
| Milk (whole) | 8.6 | 43.0 | 86.0 |
| Gasoline | 6.3 | 31.5 | 63.0 |
| Diesel | 7.1 | 35.5 | 71.0 |
| Honey | 11.9 | 59.5 | 119.0 |
| Olive Oil | 7.7 | 38.5 | 77.0 |
| Motor Oil | 7.5 | 37.5 | 75.0 |
| Propane (liquid) | 4.2 | 21.0 | 42.0 |
| Seawater | 8.556 | 42.8 | 85.6 |
Frequently Asked Questions
How much does 1 gallon of water weigh?
One US gallon of water weighs approximately 8.345 pounds (3.785 kg) at room temperature.
Does temperature affect how much a gallon weighs?
Yes. Water is densest at 4 degrees Celsius (39.2 F). At higher temperatures, water expands slightly and weighs marginally less per gallon. The difference is small for everyday purposes.
What is the difference between US and Imperial gallons?
A US gallon is 3.785 liters, while an Imperial gallon is 4.546 liters. An Imperial gallon of water weighs about 10.02 lbs. This calculator uses US gallons.
How much does a 5-gallon bucket of water weigh?
A 5-gallon bucket of water weighs about 41.7 lbs (8.345 x 5), plus the weight of the bucket itself (typically 1-2 lbs).
Why is gasoline lighter than water?
Gasoline molecules are less dense than water molecules. Gasoline weighs about 6.3 lbs/gallon compared to water at 8.345 lbs/gallon. This is also why gasoline floats on water.