Gasoline Weight by Gallon: Demystifying the Weight of Gas

Understanding gasoline weight by gallon helps you buy the correct amount of gas. This is especially true if you want to save money as gas prices increase. The main factor behind how much a gallon of gas weighs is its density.

An Article About Gasoline Weight by Gallon ~ Ran When Parked

In this post, you will learn the weight of gas by weight and the factors behind it.

What Is the Realistic Weight of One Gallon of Gasoline?

The real weight of one gallon of gasoline is around 6 pounds. This is the closest estimate since the precise weight varies depending on the type of gas and factors such as temperature. As well, the weight varies depending on the additives added such as ethanol.

Which Factors Affect How Much a Gallon of Gasoline Weighs?

One of the main factors that influence the weight of gasoline per gallon is its density. The temperature of the gas also affects its thickness and ultimately its weight. A good example is a gallon of propane is heavier than a gallon of air since propane is denser.

Another factor that affects the weight of a gallon of gasoline is the container pressure. A gallon of gas in a container under normal pressure weighs lighter than a gallon under high pressure.

It is worth noting that atmospheric pressure varies depending on how high you are above the sea level. Atmospheric pressure decreases the higher you go.

Additives Contribute to Weight Differences in Gasoline

In addition, additives in gasoline that help enhance its performance can also affect how much one gallon of gas weighs. For example, the weight of leaded gasoline is heavier compared to unleaded gasoline weigh.

The main differentiator of gasoline brands is the additives they include in their gasoline. These additives vary from stabilizers to detergents.

Based on the chemical makeup, the additives can affect the overall weight of gasoline. Some can be denser compared to the base gasoline. At the same time, others can be lighter resulting in noticeable weight differences per gallon.

Refinement Process Can Affect the Weight of Gasoline

Although all gasoline products come from crude oil, the process of refinement varies. The techniques and technology of refining the product vary from one manufacturer to another.

Different Gallons Of Gasoline ~ Ran When Parked

As a result, the different processes can result in products with unique densities and different weights.

Temperature and Altitude Determine the Weight of Gasoline

As the temperature in the environment changes, it affects how much gas weighs. In hot weather, gasoline loses its density because it tends to expand. Therefore, a gallon of hot gasoline is lighter compared to one with cold gas. The difference per gallon is around 0.06 pounds at 60°F.

Source of Crude Oil Affects the Weight of Gasoline

The properties of crude oil vary depending on where it originates. For example, Middle East crude oil may have different properties than that from Texas. The differences arise from various factors such as the reservoir geology to the biological material that formed the oil.

A Black Barrel Of Crude Oil ~ Ran When Parked

As a result, gasoline derived from crude oil from different places can have properties that affect its weight.

How Much Do Different Types of Gasoline Weigh per Gallon?

The weight of regular unleaded gas is 6 pounds per gallon. This is the commonly used type of gasoline in vehicles. Compared to other types of gasoline, regular is affordable and provides the best performance in most cars. If you are wondering how much does 1 gallon of gas cost it is about $3.66 to $4.32 for the normal gas.

The weight of one gallon of mid-grade unleaded gas is 6.2 pounds. This gasoline works well with certain vehicle makes and models that run on high-octane gas. A good example is SUV models that run on mid-grade gasoline.

A gallon of premium unleaded gas is heavier since it weighs about 6.3 pounds. This gasoline provides the highest octane rating. As a result, it is popular among high-performance cars.

Why Should You Know How Much Gallon of Gas Weighs?

Knowing the weight of a gallon of gas is important for several reasons. First, the weight of gasoline affects the quantity that can fit in the fuel tank. For example, heavier gasoline occupies less space compared to lighter gasoline. As a result, you can store more per gallon. This way, you can calculate the amount of fuel you need to fill your gas tank.

Second, the weight of the gasoline is reflected in the price tag. Heavier gasoline is more expensive because it has more energy. Third, the weight of gasoline also affects the performance of your car. For instance, premium gas will provide more power compared to regular gas.

However, premium gas burns hotter and faster. Therefore, you should be careful using premium gas since it can overload your engine. Stick to the recommended fuel for your car.

Gasoline Weight Helps With Calculation of Fuel Economy

At a glance, it may appear the weight of gasoline has a negligible effect on the performance of a car. However, the intricate car designs take into account precise gas weight thresholds. Therefore even though the weight of gasoline varies by a few pounds, using the wrong fuel can affect the efficiency of your car.

A Graphical Board Of Petrol Price ~ Ran When Parked

Although you may think using lighter gasoline will provide you with better mileage because of decreased weight, the difference is negligible. Other components such as additives are the ones that play a considerable role in fuel economy.

Understanding the amount of gas in a gallon helps you determine your car’s fuel economy. Usually, heavier gasoline results in poorer fuel consumption since the fuel contains a lot of energy which is not converted into motion.

As well, knowing the weight of gasoline per gallon lets you know the amount of fuel your car uses per mile. This ultimately affects the number of gallons you need per trip.

Gasoline Weight Helps Calculate Fuel Transportation Cost

The weight of gasoline helps in calculating the transportation cost of this fuel. When transporting vast quantities of gasoline, the seemingly negligible weight differences become a huge factor in transport costs.

For example, an increase of 50 lbs in large shipments can change the dynamics of transportation, which ultimately affects the overall cost. For fuel transportation companies, making sure that trucks can cope with the weight of gasoline is paramount.

What Differentiates UK Imperial From US Gas Gallon Weight?

The size of the UK gallon is different from the US gallon. Usually, the UK gallon is approximately 20% bigger compared to the US gallon. This means the weight of the UK gallon is heavier since it has more ounces compared to the US gallon.

The weight of the imperial gallon is around 11.34 pounds while the same gallon in the US weighs slightly above 9 pounds.

What’s Weight Difference per Gallon Between Gas and Diesel?

The difference in weight between diesel weight per gallon and gas comes down to their specific gravities. Specific gravity is a term that denotes a measure of density compared to that of water. The specific gravity of diesel varies between 0.82 to 0.90 compared to that of gas which varies between 0.71 and 0.77.

This shows that diesel is denser compared to gasoline which explains the weight difference. A gallon of diesel fuel weigh will indicate a weight that falls between 6.85 pounds and 7.5 pounds. This is higher compared to the weight of gas per gallon which is around 6 and 6.4 pounds.

That said, a gallon of water weighs approximately 8.30 pounds. Therefore, if you are wondering – what is the weight of gasoline vs water, here is your answer.

Is It Possible for the Weight of Gasoline To Change?

A gasoline change in weight can happen. However, under normal circumstances, these chances are so minute that there is no tangible difference. For instance, the specific gravity of gasoline is 0.7. This shows that the density of gasoline is 70% that of water.

The formula for density is mass/unit volume. For instance, under normal circumstances, the density of water is 1 kg/L. However, the density can change. To give you some context, water density at 120°F is 0.989 while at 40°F the density is 0.999. Therefore, minor changes can affect the density of gasoline but the difference is negligible.

Factors That Contribute to a Change in Weight of Gasoline

Besides temperature fluctuations, other factors influence the change in the weight of gasoline. For instance, some countries are embracing ethanol mixtures in their gasoline blends. Ethanol weighs less than gasoline. Therefore, depending on the amount of ethanol in the mixture, a gallon can weigh slightly less compared to non-ethanol gasoline.

Red Barrel Of Gasoline With Nozzle ~ Ran When Parked

Aging and oxidation can cause a change in gasoline weight. Over time, gasoline exposure to air can result in oxidation. The oxidation can alter the chemical composition of gasoline resulting in minor weight changes. That’s why gasoline has a shelf life.

Impurities can also alter the weight of gasoline. Before gasoline ends up in your car, it takes a long and complex journey. In the process, it may pick up impurities along the way, especially in dirty storage tanks.

What Is the Formula for Calculating the Weight of Gas?

You can calculate the weight of gasoline in various ways. One of the best ways of doing it is by using the specific gravity of gasoline. Suppose the specific gravity of the gasoline in question is 0.72.

The first thing you need to do is to change the specific gravity into density. For this, you will need to multiply the value by the density of water which is 1 kg/l. The equation will look something like this:

0.72 x 1 kg/l = 0.72 kg/l which is the density of this gasoline.

Next, convert the density into pounds/gallon (lbs/gallon). A kg/L translates to 8.2454 lbs/gal. Multiply the density of the gasoline with this value to find its weight per gallon. This will give you 5.94 lbs/gal of gasoline.

Which Is the Easiest Way of Calculating Gas Gallon Weight?

The simplest way of finding how much a gallon of gas weighs is using the gasoline weight by gallon chart. Using the fuel weight per gallon chart lets you reference the weight in pounds based on the number of gallons you want.

Also, you can use the online gasoline weight by gallon calculator. The online gasoline weight calculator makes it easy to establish the weight of both regular and premium gasoline. You only need to input 1 in the gallon value to get the gasoline weight by gallon in pounds.

Another easy way you can establish the weight of a gallon of gasoline is by weighing it. You can use a calibrated container to measure the weight of gasoline with the help of a precision scale.


In this post, you learned what is the weight of gasoline per gallon and the factors that affect the weight.

Here is a recap of the post:

  • The weight of gasoline per gallon varies depending on the type of gas.
  • Other factors include density, additives, refinement process, temperature, and source of crude oil.
  • There is a difference in weight between the imperial gallon and the US gallon.
  • Knowing the weight of gasoline is important for calculating the amount of fuel you need in your, car’s fuel economy, and fuel transport cost.

With this knowledge, you are in a better position to decide the amount of fuel you need based on your budget or need.

Rate this post
Ran When Parked