How Much Does A Gallon Of Gas Weight?

Running out of gas is a common experience for some car owners, hence the need to keep some gasoline in reserve. Imagine running out of gas in the middle of a journey? It will be a frustrating and risky occurrence.

Knowing how much gasoline is required for a car to keep running is essential. This will help you curb any occurrence of running out of gas. Also, most people are sort of contemplating the weight of gas; hence they keep asking, “How much does a gallon of gas weigh?”

Sufficient information about gasoline, its weight based on different quantities, and the difference between the weight of gas and other liquid substances like water and diesel are exposed below in this article.

How Much Does Gas Weigh?

gasoline weight calculator

How much does gas weigh? This is a fundamental question that all car owners, especially freshers, need to answer as part of the principal information they need to keep their car running perfectly.

The weight of gas (in pounds) depends on the container used in storing it. The Science and Technology Desk Reference posits that a U.S. gallon of gasoline weighs about 6.1 pounds. This is quite different from the weight of a gallon of diesel, water, and other liquid substances.

It is essential to note the following fundamental details about gasoline, diesel, and water, as these three differ in density, molecule content, etc. So, it is crucial to note that;

  • Gasoline is lighter than water. Therefore, one gallon of gasoline is lighter than a gallon of water.
  • Diesel is heavier than gasoline. The difference in weight is due to their density, as well as the number of molecules.
  • One gallon of gasoline is heavier than one bottle of soda (a 2-liter bottle).
  • A gallon of gasoline is twice heavier than a two-slice toaster.

What Is The Gas Weight Of A Full Tank?

The gas weight of a full tank depends on the size of either the car or boat, as the case may be. For instance, smaller cars come with gas tanks that accommodate around 12 gallons of gasoline; while, larger cars come with a bigger gas tank that can hold up to 15 – 16 gallons of gas.

Meanwhile, most grilling tanks come with a different weight entirely. They weigh an equivalent of 17 pounds when they are empty and can hold up to 20 pounds of gasoline. 

How Much Does A Gallon Of Gas Weigh?

If you are contemplating, “how much does a gallon of gas weigh in kilograms or in pounds?” the weight of a U.S. gallon of gas is approximately 6.1 pounds, based on the report from the Science and Technology Desk Reference. It is also equivalent to 2.767 kilograms.

This is relatively lesser than the weight of one gallon of diesel and that of one gallon of water because of their different density and molecules.

Does The Weight Of Gasoline Change When It’s Colder Or Warmer?

Of course, the weight of gas is usually altered by a change in temperature, humidity, and general weather condition. However, the difference in weight during any of these conditions is relatively small.

The change in the weight of gas rarely exceeds 1 pound, as it is usually lesser in most cases. According to Charles’ law (Gay-Lussac’s law), it is crucial to note that the temperature and volume of a gas have a directly proportional relationship.

The law states that “the pressure of a given mass of gas varies directly with the absolute temperature of the gas when the volume is kept constant.” In more simplified terms, as the temperature of gasoline increases, the pressure also increases alongside, and vice versa.

Different Types of Gas

There are 3 different types of gasoline sold at most gas stations in the United States. The difference is spotted based on their separate octane rating. The comparison table below categorically states the difference between these three types of gasoline in the U.S.

  Regular Gas Mid-grade gas Premium gas
Octane level 87 Octane 88 – 90 Octane 91 – 94 Octane
Vehicle type Most regular vehicles. Special vehicles are designed to use high-octane gas. Super vehicles designed with extremely high performance require very high octane gas.

Regular gas

As the name implies, regular gas is the most common type of fuel used in most vehicles. As a matter of fact, most vehicle manufacturers recommend that car owners use regular gas.

This type of gas offers an optimum standard for most vehicles, and it is less expensive compared to the other types of gas. It comes with about 87 octanes.

Mid-grade gas

Mid-grade gas is referred to as specialty gas. It is suitable for specific types of vehicle make and models designed to run on a gas type with a higher octane level.

For instance, some specific SUVs are designed to utilize mid-grade gas with higher octane levels. It is important to note that the higher octane equals higher engine performance. It comes with around 88 – 90 octane, and it is relatively more expensive than regular gas.

Premium gas

Premium gas is the gas type with the highest octane level sold in U.S. gas stations. This gas type is commonly used in vehicles. However, some high-performance cars are designed to run on premium gas with a very high octane level.

Premium gas comes with around 91 – 94 octane, and it costs more than both mid-grade gas and regular gas. They are also referred to as “high octane gas.” Some people also call it “super gas” because they are used in super high-performing vehicle engines.

how much does 5 gallons of gas weigh


Q: How much does a gallon of unleaded gasoline weigh?

If you are asking, “how much does a gallon of unleaded gas weigh?” A U.S. gallon of unleaded gasoline weighs an equivalent of 6.1 pounds. This is not as heavy as an imperial gallon of gasoline which weighs an equivalent of about 7.2 pounds.

The weight is further broken down to 2.7669 liters (6.1 pounds) for a gallon of unleaded gasoline and 3.2659 (7.2 pounds) liters for an imperial gallon of gasoline.

If you are also wondering, “How much does a gallon of gas cost?” The estimated cost from the National average gas price is $3.416.

Q: What does 5 gallons of gas weigh?

If a gallon of unleaded gasoline weighs 6.1 pounds (2.7669 liters), then 5 gallons of gas would weigh an equivalent of 30.5 pounds (13.8345 liters), respectively. So, if you were wondering, “How much does 5 gallons of gas weigh?” the simple arithmetic above is a perfect answer.

The quantity of gas or number of gallons has a direct influence on the weight of the gas. While planning a boating or car trip, it is important to consider how much gasoline your boat or car engine consumes on a particular trip.

It is also important to understand the engine fuel mileage, as well as the tank’s capacity. All these factors will enable you to figure out the sufficient quantity for every trip.

Q: What does 100 gallons of gas weigh?

One hundred (100) gallons of gas weighs an equivalent of 700 lbs. Small cars with small fuel tank capacity hold only up to 12 gallons of gasoline; while, others may hold up to 15 gallons.

Meanwhile, the gas tank of a boat can hold up to 30 gallons of gasoline. If you are asking, “How much does 30 gallons of gas weigh?” It’s just around 183 – 189 pounds.

However, the size of the boat also matters. While a smaller boat’s gas tank may hold around 5 gallons, a large yacht will be able to hold up to 250,000 gallons of gasoline at a time.

Q: What is heavier water or gasoline?

If you are contemplating the weight of gasoline vs. water, gasoline and water are both liquid substances; however, their weight differs. Water possesses a higher density compared to gasoline. This is why gasoline can float on water.

While a gallon of gasoline weighs an equivalent of 6.1 pounds, one gallon of water weighs approximately 8.4 pounds. Therefore, water is heavier than gasoline because of its density, as well as its molecular content.

Q: Is jet fuel heavier than gasoline?

Jet fuel is slightly heavier than gasoline. While gasoline contains hydrocarbon of around 7 – 11 carbon atoms, jet fuel consists of hydrocarbon of between 12 and 15 carbon atoms, making it heavier than gasoline.

Jet fuel is somewhat closer to kerosene than gas. It is also essential to note that jet fuel comes with injected addictives that form the mix. These contents make it heavier than gasoline in every aspect.

Q: How much does a gallon of 93 octane gasoline weigh?

A gallon of 93 octane gasoline weighs an equivalent of 6 – 6.1 pounds. The weight is the same as that of 91 octane gasoline. 93 octane gasoline is pretty expensive compared to regular gas.

91 – 94 octane gasoline falls within the premium gas category, and they seem to be more expensive than mid-grade gas (with 88 -90 octane) and regular gas (87 octanes).

Q: Does gas weigh the same as diesel?

Gas does not in any way weigh the same as diesel. For those asking, “How much does a gallon of diesel fuel weigh?” One gallon of diesel weighs an equivalent of 7.1 pounds. Meanwhile, a gallon of gasoline weighs around 6.1 pounds which makes diesel 1 pound heavier than gasoline.

The difference between the weight of gas and diesel is due to their different density and molecules. Diesel has a higher density and larger molecules than gasoline. The autoignition temperatures and flashpoints of diesel are higher than those of gasoline as well.

Final Words

Planning a trip is very crucial in determining how successful the journey will end. Therefore, ensure to check your car’s gas mileage, maximum carrying capacity, as well as gas content level.

It would be easy to determine how much you would need for a trip if you could specifically answer this fundamental question – How much does a gallon of gas weigh?

Once you answer that question, your preparation process will become pretty easy. Meanwhile, the question is already answered for you in this article. So, go ahead and plan your trip.

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Osuagwu Solomon

Osuagwu Solomon is a certified mechanic with over a decade of experience in the mechanic garage, and he has over five years of experience in the writing industry. He started writing automotive articles to share his garage experience with car enthusiasts and armature mechanics. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyer’s guides, and car and tools comparisons.

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