How Much Does a Gallon of Gas Weight? [Weight Chart]

When it comes to gasoline there is likely much that you do not actually know. After all, there is a great deal that many of us do not know because it has never been an important subject previously. After all, we put gasoline in our vehicles and largely ignore the subject otherwise. But there are some things that you may want to know about gasoline, including things about the weight.

What is the Standard Weight for Gasoline?

A standard gallon of gasoline weighs approximately six pounds. This is less than a full gallon of water which weighs just over eight pounds. This is because gasoline contains a number of compounds, some of which consist of a set amount of oxygen and other ‘gaseous’ ingredients.

Keep in mind that weight could vary slightly between different brands of gasoline and different types (regular vs. premium, for example). The weight will not fluctuate much and in general, should not show a difference of more than a few ounces at most. This is because the majority of the components of the gasoline are still the same or similar in weight between different types.

How Much Does Gasoline Weight Per Gallon? [Chart]

How much does gasoline weigh per gallon? You can find out from this chart!

US GallonsAverage Gasoline Weight (lbs)

For informational purposes only! Gasoline weighs roughly 6 pounds per gallon, but it varies depending on many factors. As a rule of thumb in the US, gasoline density ranges from 5.9 up to 6.5 pounds per gallon.

How Much Do 5 Gallons of Gas Weigh?

A single gallon of gasoline weighs approximately six pounds, which means that five full gallons of gasoline would weigh 30 pounds. This adds quite a bit of weight to your vehicle, considering the average vehicle can hold upwards of 15 to 20 gallons of gasoline in a full tank.

This amount of gas will generally fit into one of the standard gas cans that you see at convenience stores and gas stations. The red, plastic containers hold approximately five gallons of fuel for you to have on hand as needed. These can be great for emergency situations but it’s important to note that if you fill them with five gallons of gasoline they will weigh about 30 pounds, which makes them quite heavy to carry wherever you may need it.

What Do 20 Gallons of Gas Weigh?

If you have a 20-gallon tank it means that you are able to hold 120 pounds of gasoline. This is quite a bit compared to smaller vehicles which hold only 15 or fewer gallons. Still, at six pounds per gallon, there is a great deal of weight involved in a full tank of gas.

You will generally not carry this much gas with you other than actually in the fuel tank for your vehicle. That’s because this is about the size of a gas tank in many vehicles. Some are actually smaller than 20 gallons, but you generally won’t find many that are more than this. Since 20 gallons is over 100 pounds of weight it’s unlikely you’ll want to have that much otherwise, unless you’re trying to stay prepared for some other reason.

How Much Do 16oz of Gas Weigh?

One pound of gasoline, or 16 ounces of gasoline, weighs approximately six pounds. There may be some minor fluctuation in this based on the specific type of gasoline that is used though this is an average amount for most types of gasoline.

What Weighs More Gasoline or Water?

One gallon of gasoline weighs approximately six pounds. On the other hand, a single gallon of water would weigh nearly eight and a half pounds (8.4) This means that water weighs quite a bit more than gasoline, even in the same quantity.

That means if you’re going to be carrying both water and gasoline for any reason you’ll want to be careful about how much you have of each. Carrying five-gallon containers may seem like a good way to go, but remember that the two containers won’t be the same weight. The same is true if you need to store them for any reason. You’ll want to account for the difference in weight. Also, this may help you to differentiate the two when you are grabbing containers from storage at your home.

Does Gasoline Float on Water?

For the most part, gasoline will float on the top of the water, though it will not easily be separated from the water once the two have been joined in any way. If gasoline is poured over the top of the water (or water is added to gasoline) they will be somewhat mixed from then on.

Gasoline will end up similar to oil spills that we see on the news. The gasoline sits on the top of the water but is extremely difficult to separate out entirely or to remove off of the water, even with specialized equipment. This means that it is extremely dangerous for gasoline to get into a waterway.

What Happens if Gasoline is Mixed with Water?

Gasoline mixed with water is harmful to anything that needs the gasoline to run and is harmful to the environment and the water as well. If mixed in a container when the gasoline and water are not intended for any purpose it would not cause a reaction, however.

Very small amounts of water in the gasoline used to power your vehicle or other machinery may not cause any problems. This can happen naturally through the process of driving the vehicle, for example. More than a cup (and sometimes not even that much) could damage a vehicle however if mixed into the fuel tank. This amount of water does not get into the tank by accident and can cause serious damage to the engine.

On the other hand, gasoline that gets into waterways can cause a great deal of harm to the water source. This includes drinking water and even the surrounding plant and animal life. Not to mention animals that live in the water can be endangered by the contamination.


There’s a lot that many people don’t even think about when it comes to gasoline, but you probably want to know a little more before you’re using it for anything, and especially before you try to carry it any distance.


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