1 Gallon Water Weight quick answers
This is the common everyday answer for fresh water.
An imperial gallon is larger than a US liquid gallon.
Saltwater is slightly denser than freshwater.
For one US gallon, the calculation is 1 × 8.34.
1 Gallon Water Weight conversion table
Use this table for fast water-only estimates. Add container, tank, stand, trailer, or packaging weight separately.
| Volume | Pounds | Kilograms | Typical use |
|---|---|---|---|
| 1 US gallon | 8.34 lb | 3.79 kg | One gallon jug |
| 2 US gallons | 16.68 lb | 7.57 kg | Two jugs |
| 3 US gallons | 25.02 lb | 11.36 kg | Small container |
| 4 US gallons | 33.36 lb | 15.14 kg | Container load |
| 5 US gallons | 41.70 lb | 18.93 kg | Bucket / cooler bottle |
| 10 US gallons | 83.40 lb | 37.85 kg | Large container |
When this water weight matters
One-gallon water bottles and jugs
One US gallon of fresh water weighs about 8.34 pounds, or about 3.79 kilograms. A full one-gallon jug weighs more after adding the plastic container and cap.
Cooking, camping, and emergency storage
One gallon is a useful planning unit for drinking water, camping water, cleaning water, and emergency storage. Multiply the number of gallons by 8.34 to estimate water-only weight.
US gallon vs imperial gallon
A US liquid gallon weighs about 8.34 pounds of fresh water. An imperial gallon is larger and weighs about 10 pounds of water.
Fresh water formula: pounds ≈ US gallons × 8.34
Saltwater estimate: use roughly 2.5% more than freshwater for everyday planning.
Related water weight calculators
1 Gallon Water Weight FAQ
How much does 1 gallon of water weigh?
One US gallon of fresh water weighs about 8.34 pounds, or about 3.79 kilograms. A full one-gallon jug weighs more after adding the plastic container and cap.
Does saltwater weigh more?
Yes. Saltwater is denser than freshwater, so the same volume weighs slightly more. The calculator includes a simple saltwater estimate for planning.
Should I include the container weight?
Yes. If you are planning a tank, bucket, cooler bottle, pool, trailer, or storage system, add the empty container and equipment weight to the water-only weight.