How Much Does a Gallon of Oil Weigh

Do you know how much a gallon of oil weighs? If not, don’t worry! You’re not alone. Most people don’t know the weight of oil because it can vary depending on the type of oil. In this blog post, we will discuss the weight of oil and everything you need to know about it!


A gallon of oil weighs about eight pounds. This weight can vary depending on the type of oil, but it’s a good estimate for most types.

Oil is a heavy substance, and this heaviness has both benefits and drawbacks. On the one hand, oil’s weight means that it is less likely to evaporate or dissipate than other liquids. On the other hand, its weight also makes it difficult to transport and move around.

Knowing how much a gallon of oil weighs is important for a variety of reasons. For example, if you are looking to buy or sell oil, you need to be aware of the weight so that you can accurately calculate prices. Additionally, if you are using oil in your home or business, you may need to know the weight so that you can safely store it in a tank or other container. Finally, if you are moving oil from one place to another (e.g., by truck), then knowing its weight is also critical; this will help ensure that your vehicle has enough space and strength for transporting this substance without causing any damage along the way.

How to Calculate the Weight of a Gallon of Oil


The weight of a gallon of oil varies depending on the type or grade of the oil. For example, motor oil is heavier than water while lubricants are lighter. Here are some typical weights:

  • Motor Oil = Highest density (heaviest) – around 0.89 kg/l (pound per gallon);
  • Grease and Lubricants = Lower density than water – floats on top;
  • Motor Oil #90= Medium/High density – around 0.88 kg/l;
  • Motor Oil #80= Low medium density-around 0.86 kg/l;
  • Gasoline Engine Oils = Very low density-around 0.77kg/l;
  • Gearbox Oils = Very low to lowest densities possible for an oil-0.71 kg/l.

A gallon of oil weighs around eight and a half pounds. However, this can vary depending on the type of oil. For example, a gallon of motor oil will weigh more than a gallon of gearbox oil.

When calculating the weight of oil, it is important to know the density of the fluid. This can be found online or through product specifications from the manufacturer. By knowing the density, you can calculate how much a gallon of oil weighs in kilograms or pounds.

If you’re looking for an easy way to remember how much a gallon of oil weighs, just remember that it’s about eight and a half pounds. And if you need to convert between kilograms and pounds, there’s an easy equation to do this.

If your oil is in a container that measures one gallon, then you can use the following conversion: One liter of water weighs approximately one kilogram or about two pounds and three ounces. A US gallon contains four quarts (128 fl oz) which is equal to three and a half kilograms or eight pounds.

So if you have an oil weight calculator on hand, it will give you accurate readings for both metric and imperial measurements without having to convert from one unit to another yourself!

Grades of Crude Oil


Oil is created in the Earth’s core, and it generally takes millions of years to form. Oil is transported by natural forces such as water or air currents toward porous rock formations above it. As time goes on, more oil forms and also gets pushed towards the surface, creating what we call reservoirs of crude oil.

As oil comes into contact with oxygen from the atmosphere over a long period of time, it starts to degrade in quality; this process is called biodegradation. This degradation occurs because bacteria feed off this dead organic matter that makes up most of the substance that we call crude oil.

Not all crude oil is the same; in fact, there are four different grades of crude:

  • extra heavy sour,
  • heavy sweet,
  • light sweet,
  • and waxy.

These names describe their properties such as density (weight), sulfur content, and viscosity (thickness). The denser a grade of oil is, the more weight it has per gallon. The oil that contains sulfur molecules from decaying organisms takes longer to break down than oil without them does. Viscosity describes how thick or thin an oil is based on its temperature; for example, if you heat up olive oil past 75 degrees Fahrenheit it will become thinner and runnier.

As far as weight goes, extra-heavy sour has the most at about pounds per gallon, while light sweet has the least at about pounds per gallon. Each gallon of extra-heavy sour oil weighs more than seven pounds more than each gallon of light sweet, so the type and grade of crude that is used can make a difference in how much it costs to produce as well.

The grades of crude oil are listed below in order from least dense to most:

Light Sweet – This type is the lightest and has a low sulfur content. It is highly refined, making it easy for refineries to process into products like gasoline or jet fuel. Light sweet crude oil can be found in countries such as Nigeria, Norway, and Venezuela.

Medium Sour – This grade of oil contains moderate amounts of sulfur and does not burn as efficiently as other types do; therefore, it must be processed more heavily before being used for energy purposes. The Middle East produces much of the world’s medium sour crude oil supply because this region has large reserves of this resource that have been discovered through drilling efforts over time (the first discovery was made in 1938).

Heavy Sour – This grade of oil contains high amounts of sulfur and must be heavily refined before being used as an energy source. Heavy sour crude oil is produced on a smaller scale than other types because it requires more effort to produce usable end products from it.

Extra-heavy sour crude – The densest type of all, this resource contains the highest amount of sulfur and is very difficult to process into usable forms like gasoline or jet fuel; therefore, only small quantities are extracted each year despite its abundance around the world (the largest deposits were found beneath Canada’s tar sands region).


Now that you know how much a gallon of oil weighs, you can better estimate how much fuel your vehicle will need for a road trip. Remember to account for the weight of the other items in your car, as well.

If you’re looking to save on gas money, consider using a less-weighty type of oil in your engine. However, you should find out what type of oil your vehicle’s manufacturer recommends.

Choosing the right type and amount of oil can help make sure that your engine stays healthy for years to come and requires less maintenance. If you’ve been wondering how much a gallon of oil weighs, hopefully, this article has answered all your questions.

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