How Much Does A Gallon Of Diesel Weigh: Everything You Need To Know About

Diesel fuel is a type of petroleum-based fuel used in diesel engines. It is often used in heavy equipment, trucks, and boats. Diesel engines are popular because they are more efficient than gasoline engines and produce less pollution.

In this article, we will discuss how much does a gallon of diesel weigh? Furthermore, we will discuss how to measure diesel? Why is it important? Factors affecting the weight of diesel. And, some tips to keep things smooth for truck drivers.

Gallon Of Diesel
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How much does a gallon of diesel weigh? The exact weight of diesel varies based on the fuel grade and type of measurement employed. The U.S. gallon weighs 6.82-8.0 lbs, whereas the imperial gallon weighs 8.19-9.61 lbs and the dry gallon weighs 7.93-9.32 lbs in the United States (US). When weighing diesel, prefer the U.S. gallon.

Measurement of Diesel

Determining the weight of diesel fuel per gallon might be difficult since there are numerous types of diesel. Not to mention that each variety’s density is not constant owing to a number of causes.

However, determining this value is now easier, especially if you already have the diesel type’s density values (lbm/ft3).

You must first determine the density of that particular fuel. That number is then divided by either 7.48 (the equivalent of 1 lb. per U.S. gallon), 6.23 (the equivalent of 1 lb. per imperial gallon), or 6.43 (the equivalent of 1 lb. per U.S.’dry gallon).

Examine the calculators or converters that may appear in your search results online, as some are based on pounds per cubic foot (lb/ft3). There is a significant change between lbm/ft3 and lb/ft3.

Why is Measurement Important?

Knowing “how much does a gallon of diesel weigh?” is always a good idea. It’s impossible to dispute that fact.

When loading or fuelling a vehicle, drivers frequently need to be knowledgeable about their equipment and axle weight – especially truckers who drive vehicles with weight limitations. Calculating a load of fuel in a ship or tanker truck is also influenced by diesel weight per gallon.

A cruise ship’s fuel tank must be designed to endure the various elements of a long sailing journey, such as wind and vibration. It’s critical to maintain the proper specifications for a cylindrical tank where diesel is stored, as well as to keep a cruise ship at an optimal trim to ensure that it remains steady in rough weather.

Another advantage is that when you fill your tank with gasoline, your vehicle’s weight increases, reducing gas mileage.

For off-roaders, this entails maintaining their 4×4 or ATV so that any leaks or spills from filling their fuel tanks beyond capacity don’t cause damage to the engine.

Factors Affecting Weight of Diesel

1. Measurement Unit

The density of a fluid, as represented by the number of grams per cubic centimeter, kilogram per liter, etc., is constant. The actual value you obtain is near the constant, with three distinct measurements in use: the imperial gallon (4.55 liters), the U.S. gallon (3.76 liters), and the U.S. dry gallon (4.40 liters).

Although the imperial gallon would weigh the most, internationally it is defined using the U.S. gallon as standard.

2. Temperature

Fuel volume varies with humidity, temperature, and weather changes. Diesel is around 7 lbs/gallon at room temperature. It’s a little over 7 lbs when it’s 32°F. When the temperature is extremely high (100°F or above), a gallon of diesel weighs about 6.8 lbs.

Because of this difference, diesel’s density is measured at 15°C or 59°F. Similarly, the viscosity of diesel increases as the temperature falls. Its form changes to a gel at temperatures ranging from -2.2°F to 5°F and does not just clog fuel lines and filters, but also makes it somewhat heavier.

3. Specific Gravity

The API gravity is a metric used to determine the relative weight of oil compared to water and is required in order for diesel volume to be converted into US gallons. It’s also a widely accepted field test for assessing the quality and energy level of diesel fuel – the higher the API value, the lower the energy; the higher the S.G., the greater energy output.

Biodiesel has a specific gravity (S.G.) of 0.88, which makes it distinct from diesel oil (D.O.). Diesel mixtures with sulfur levels above ULSD have higher values than biodiesel, contributing to its lower weight. 2D or Number 2 diesel would range between 0.876 and 0.802 in terms of the second decimal place (0.82-0.90).

In general, diesel fuel has a specific gravity of 0.82 to 0.90, resulting in a weight range of 6.85 lbs to 7.5 lbs per gallon.

4. Fuel Grade

The cetane level is a measure of diesel fuel’s ease of ignition, power, and efficiency. It affects the overall weight of the fuel because it is based on its refining process. A higher cetane number results in greater API gravity and lower density in gasoline as a result of the refinement process.

The lowest acceptable weight for diesel in the United States is 7.00 lbs, whereas it’s 6.95-7.04 lbs in the United Kingdom due to higher minimum cetane levels. Diesel in Canada matches Europe’s EN 590 requirements, resulting in a lower weight range of 4.28-4.61 kg (8.60-9).

Tips for Truck Drivers

1. Fuel Weight on the Axles

A maximum spread axle weight of 20,000 lbs is permitted on the spread and a total of 80,000 lb gross. However, most new drivers do not pull spread axles, so stick to the 12,000-pound, and 34,000-pound setup.

2. Location of the Tanks

When fueling, the diesel weight will ride on either the steering axle or the drives, depending on where the tractor’s tanks are positioned. When a long hood truck is fueling with its tanks beneath the bunk, the drive axles will be having the weight of the fuel.

Because of this, a long hood truck must maximize the permitted weight when loading onto the trailer and steering axles in order to allow room for extra weight on the vehicle while fuelling.

3. Plan the Stops

When you anticipate being close to your weight limits, it’s sensible not to fuel up just before stepping on the scale. Calculate fuel stops when planning your trip and remember where the scales are located along the way.

This easy-to-follow road trip planning will help you avoid hefty penalties and a lot of aggravation!

4. Leave Space for Fuel

On a 77,000 lbs unit, to allow a 31,000-pound drive weight, the truck driver wants his steering as close to 12,000 lbs as feasible and his trailer as close to 34,000 lbs. as feasible. To add fuel without being overweight, he needs a 3,000-pound ‘buffer.’

3,000 pounds is quite adequate for practically all highway vehicles unless they can carry more than 300 gallons of diesel, which most trucks cannot do.


Diesel fuel is an important part of trucking. Its weight, how to measure it, and the factors that affect its weight are all things that need to be considered when dealing with this type of fuel. Also, some tips to keep things smooth for truck drivers were discussed. Following these tips can help avoid hefty penalties and a lot of aggravation.


Does diesel weigh more when cold?

At colder temperatures, such as 32°F, a gallon of diesel will weigh about 7.05 lbs. In warm weather and at very high temperatures like 110°F, a gallon of diesel will weigh approximately 6.8 lbs.

How much does a gallon of diesel weigh?

The weight of diesel fuel varies depending on the temperature and how it was refined. Generally, a gallon of diesel weighs between six and seven pounds. However, biodiesel has a lower weight because it is less dense than regular diesel.

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