Weight · Water
How much does water weigh?
8.345 lb/gal · 1.00 kg/L · specific gravity 1.000.
—
| Volume | Pounds | Kilograms |
|---|---|---|
| 1 gal | 8 lb | 4 kg |
| 5 gal | 42 lb | 19 kg |
| 55 gal | 459 lb | 208 kg |
| 100 gal | 835 lb | 379 kg |
| 275 gal | 2,295 lb | 1,041 kg |
| 330 gal | 2,754 lb | 1,249 kg |
| 500 gal | 4,172 lb | 1,893 kg |
| 1,000 gal | 8,345 lb | 3,785 kg |
| 5,000 gal | 41,725 lb | 18,926 kg |
Basis
Pure water at 60°F, NIST reference density. The cleanest number on this page — 1 kg per litre, 8.345 lb per US gallon. Liquid weight excludes the container — add tare weight for transport math. Matching tank charts: 55 gal tank · 275 gal tank · 330 gal tank · 500 gal tank · 1000 gal tank.
FAQ
How much does a gallon of water weigh?
8.345 lb/gal. That is 1.00 kg per litre (SG 1.000).
How much does a 55-gallon drum of water weigh?
About 459 lb of liquid, plus roughly 40–50 lb for a steel drum. A brim-full drum actually holds ~57.7 gal — see the drum chart.
Does temperature change this?
Yes — liquids expand when warm. Hydrocarbons move roughly 0.4% per 10°F; the figure here is the standard reference temperature value.