A U.S. gallon of gasoline usually weighs about 6 to 6.3 pounds, while a gallon of diesel fuel is typically closer to 7 to 7.5 pounds. Use these practical ranges to estimate fuel load, tank weight, and hauling needs.
If you are asking how much does a gallon of gas weigh, the most useful everyday answer is about 6.2 pounds per U.S. gallon. That figure is close enough for most vehicle, trailer, portable container, and payload estimates, but the actual number can move slightly with the fuel blend and temperature.
How much does a gallon of gas weigh?
A gallon of gasoline weighs roughly 6.0 to 6.3 pounds per U.S. gallon. A commonly used planning average is 6.2 pounds. So, 5 gallons of gasoline weighs about 31 pounds, before adding the weight of the fuel can or tank.
Diesel fuel is denser, so it weighs more: roughly 7.0 to 7.5 pounds per U.S. gallon. For a quick estimate, use 7.1 pounds per gallon. That means 5 gallons of diesel fuel weighs about 35.5 pounds.
Gasoline vs. diesel fuel weight per U.S. gallon
Diesel is generally heavier than gasoline because it is denser. This difference adds up quickly in large fuel tanks, work trucks, farm equipment, generators, and bulk storage containers.
At the same number of gallons, diesel usually adds around 0.9 pound more per gallon than gasoline. A 20-gallon diesel fill can therefore weigh about 18 pounds more than a 20-gallon gasoline fill.
| Fuel | Typical weight | Quick planning average |
|---|---|---|
| Gasoline | About 6.0–6.3 lb per U.S. gal | Use 6.2 lb per gallon |
| Diesel fuel | About 7.0–7.5 lb per U.S. gal | Use 7.1 lb per gallon |
How much do 1, 5, 10, and 20 gallons weigh?
The estimates below use 6.2 pounds per gallon for gasoline and 7.1 pounds per gallon for diesel. They show fuel weight only—not the tank, vehicle, drum, can, or trailer carrying it.
| U.S. gallons | Gasoline weight | Diesel weight |
|---|---|---|
| 1 gallon | About 6.2 lb | About 7.1 lb |
| 5 gallons | About 31 lb | About 35.5 lb |
| 10 gallons | About 62 lb | About 71 lb |
| 15 gallons | About 93 lb | About 106.5 lb |
| 20 gallons | About 124 lb | About 142 lb |
| 25 gallons | About 155 lb | About 177.5 lb |
15-gallon gasoline tank
A full 15-gallon gasoline tank adds roughly 93 pounds of fuel.
26-gallon diesel pickup tank
A full 26-gallon diesel tank adds roughly 185 pounds of fuel.
5-gallon fuel can
Five gallons weighs about 31 lb as gasoline or 35.5 lb as diesel, plus the can itself.
Why gasoline and diesel weight can vary
Fuel is not a single pure substance with one unchanging density. Refining specifications, seasonal blends, oxygenates such as ethanol, and storage temperature can all affect the weight of a gallon.
Warmer fuel expands and becomes slightly less dense per gallon; cooler fuel is slightly denser. For normal driving and everyday load planning, the averages in this guide are usually appropriate. For regulated transport, engineering work, or commercial measurement, use the applicable fuel specification and temperature-corrected data.
Three reasons the exact number changes
- Temperature: liquid fuel expands when warm and contracts when cool, changing its density per gallon.
- Blend and season: gasoline formulas can change by region and season to meet emissions and performance requirements.
- Ethanol content and fuel grade: ethanol-blended gasoline and conventional gasoline can have slightly different density characteristics.
Unleaded 88 vs. 87: what drivers should know
Unleaded 88 is commonly used to describe E15 gasoline: fuel containing up to 15% ethanol and carrying an 88 AKI octane rating. Regular Unleaded 87 is commonly E10 or less, meaning it may contain up to 10% ethanol and has an 87 AKI rating.
The search phrase “E88 gas” can be confusing. The number 88 usually refers to octane rating on the pump label, while E15 refers to the ethanol blend level. Neither label alone tells you that the fuel is right for every vehicle.
Fuel weight FAQs
How much does 1 gallon of gasoline weigh?
One U.S. gallon of gasoline typically weighs around 6.0 to 6.3 pounds. For a fast estimate, use 6.2 pounds per gallon.
How much does 5 gallons of gas weigh?
Five gallons of gasoline weighs about 31 pounds using a 6.2-pound-per-gallon average. Add the weight of the container if you are estimating how much a full fuel can weighs.
How much does a gallon of diesel fuel weigh?
A U.S. gallon of diesel fuel commonly weighs around 7.0 to 7.5 pounds. A useful planning average is 7.1 pounds per gallon.
Is diesel heavier than gasoline?
Yes. Diesel is generally denser than gasoline, so the same U.S. gallon volume usually weighs more. Using the averages here, diesel weighs about 0.9 pound more per gallon than gasoline.
