How much does 4 gallons of water weigh?
Four gallons of water weigh approximately 33.4 pounds.
Approximately 141,610 lbs. which is 70.8 tons Answer: Unless you are using Imperial gallons, in which case the weight is 17,000 lb. or 8.5 short tons or 7.7 long tons (about the same value as metric tons or tonnes) These weights are estimate at +4o C where water has its highest density. As the temperature approaches the boiling point the weight for the volume would decrease by about 4%