One U.S. gallon of water weighs 3.78 kg at room temperature. On the other hand, an Imperial gallon of water weighs 4.545 kg.
It’s, however, important to note that water’s weight varies with temperature fluctuations. Warm water weighs less than cold water.
What is the weight of one gallon in pounds?
A gallon weighs around 8.34 pounds in the U.S. customary system and 10.02 pounds in the British Imperial system.
Units of a Gallon
There are 3 types of gallon: the 2 U.S. gallons (liquid gallon and dry gallon) and the Imperial gallon.
The table below shows the 3 units of a gallon and their weight in liters, pounds and kg
| Weight of a gallon at room temperature | Liters | Pounds | Kilogram |
|---|---|---|---|
| 1 U.S. gallon of water | 3.78 | 8.34 | 3.78 |
| 1 Imperial gallon of water | 4.54 | 10.02 | 4.54 |
| 1 U.S. dry gallon | 4.40 | 9.71 | 4.40 |
FAQs
Q: How much does a gallon of water weigh?
One U.S. gallon weighs 8.34 pounds or 3.785 kg at room temperature. It is also equivalent to 128 fluid ounces or 3.785 liters.
On the other hand, an imperial gallon weighs 10.02 pounds or 4.546 kg at room temperature. It also equals 160 fluid ounces or 4.546 liters.
Q: How much do 5 gallons of water weigh?
It depends on the type of gallon in question. Is it the U.S. gallon or the Imperial gallon
1 U.S. gallon weighs 8.34 pounds.
5 US gallons = (5 x 8.34) = 41.7 pounds.
5 U.S. gallons weigh 41.7 pounds or 18.89 kg.
What about 5 U.K. gallons?
1 UK gallon = 10.02 pounds
5 UK gallons = (5 x 10.02) = 50.1 pounds
5 U.K. gallons weigh 50.1 pounds or 22.731 kg.
Q: How does the environment affect the weight of water in a gallon?
Fluctuations in temperature affect the weight of water.
When temperature increases, water molecules expand and move from each other. This makes the water less dense. A decrease in temperature, on the other hand, makes the water denser.
A gallon of warm water, therefore, weighs slightly less than that of cold water.
Atmospheric pressure can also affect the weight of your water but only on a small scale.
Q: Which is heavier, a gallon of water or milk?
A gallon of milk is heavier than water because of the fat content in milk. In fact, a gallon of milk weighs around 8.6 pounds, while a gallon of water weighs 8.34 pounds.
Resources
- https://sciencenotes.org/much-gallon-water-weigh-easy-calculation/
- https://www.thecalculatorsite.com/articles/units/us-gallons-imperial-gallons.php
- https://homex.com/ask/which-is-heavier-a-gallon-of-milk-or-water
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