How Much Does a Gallon of Diesel Weigh?


As you observe a truck driving down the road, you likely don’t consider all that goes into its operation. Yet diesel fuel is much denser and, therefore, heavier than gasoline or water and must therefore weigh more to be transported safely.

Weight may differ slightly based on temperature and specific gravity; however, the typical gallon weighs 5-6 lbs.

Units of Measurement

Knowing the weight of a gallon of diesel fuel can save time and money. Unfortunately, many truck drivers forget to factor the diesel weight into their total vehicle weight calculations, leading them to incur costly overload fines or risk suspension of their rig.

Depending on your country and type of fuel, there are various units of measurement for diesel fuel, including US gallon, imperial gallon, and liters. You may also come across online calculators or converters that use alternative measures (LBM/ft3), which could confuse determining their weight – which, in this instance, would apply to liquids like diesel.

A gallon of diesel fuel typically weighs 6.91 pounds in the US. However, its exact weight can fluctuate based on factors like temperature and cetane rating; lower cetane ratings make the fuel denser and, therefore, heavier per gallon than fuel with higher cetane ratings.

Its specific gravity and viscosity must be carefully considered if you plan to use diesel for off-road equipment or home heating purposes. Winter diesel, with chemical properties similar to kerosene, should typically be reserved for colder climates as its high specific gravity prevents freezing.

If you use standard No. 2 diesel with a 42-45 cetane rating, expect each gallon to weigh about 7 pounds. When blended with biodiesel, it may weigh less due to its lower density. Being aware of how much diesel can help ensure compliance with state and federal highway regulations and avoid fines for exceeding specific weight limits on trips; plus, it allows you to plan out trips accordingly so your tank space accommodates all necessary fuel.


Diesel fuel is essential to the performance of any vehicle, from heavy trucks and four-wheelers to off-road, four-wheelers and four-wheeled off-roaders. Available in various forms and blends, diesel is an incredibly versatile source of energy that’s used by an array of vehicles and industrial applications alike. Knowing how much a gallon of diesel weighs is critical for anyone involved in the industry, such as truck drivers, shipping lines, storage tank facilities, or resellers of refined oils or fuels.

Temperature is one of the critical determinants of how much a gallon of diesel fuel weighs, given its distillate nature. Temperature impacts density, becoming denser with cold temperatures and less viscous when warmer ones arrive. Furthermore, temperature can have an impactful viscosity effect that affects its efficiency and performance as a fuel.

Additionally, rapid temperature fluctuations may cause diesel fuel vaporization, leading to volume and weight loss. Therefore, it must be stored in an environmentally controlled area.

When storing diesel fuel, its container must remain airtight to prevent oxidation and contamination of its contents. Furthermore, keeping your tank away from other containers that might leak or spill is also recommended.

Various factors affect how much one gallon of diesel fuel weighs, but one key consideration is its type and grade. Knowing its weight can help you make informed purchasing decisions and prevent costly overweight fines.

Specific Gravity

As a truck driver, you must know how much a gallon of diesel weighs to stay under your weight limit when filling up and avoid expensive fines or penalties from weighing scales. Being aware of how much your load and fuel weigh will also aid you when trying to calculate an optimal vehicle weight for hauling specific cargoes.

Diesel is a form of petroleum, and its density depends on ambient temperatures and other factors. Diesel will become denser as ambient temperatures decrease; additionally, it becomes thicker and viscous in cold weather months, potentially leading to clogs in fuel lines and filters unless proper additives protect it from this issue. Therefore, appropriate additives must be used to avoid such problems from arising.

A gallon of diesel can weigh between 5 and 7 pounds, depending on its quality and where it was purchased. On average, in the United States, it usually falls under 7 pounds per gallon while slightly over this threshold in Canada; these differences do not significantly affect its overall weight.

Calculators and converters online provide tools that allow you to determine how much a gallon of diesel fuel weighs. Still, you should use an accurate measurement unit as some devices will convert pounds to pounds based on LBM/ft3, giving an inaccurate answer. Furthermore, some calculators use different units of measurement for volume than weight, which could result in inconsistent results, so use only one unit throughout all calculations for consistency’s sake.


A gallon of diesel fuel varies in weight depending on its type and specific gravity, temperature fluctuations, and other environmental influences. When truck drivers determine how much power to transport on the road, all these considerations must be considered; otherwise, they risk getting in trouble with the law at weigh stations when their cargo hits scale for inspection.

One of the most widely-used types of diesel fuel, known as number 1 diesel, is often preferred for cold weather use due to its lower viscosity and shared chemical properties with kerosene. Engineering ToolBox reports that this variety weighs roughly 7.3 pounds per gallon at 59 degrees Fahrenheit – slightly more than number 2 diesel.

Additives used to enhance performance and reduce emissions, such as diesel exhaust fluid (DEF), can have an effect on how much a gallon of diesel weighs, specifically its DEF content, which cleans engines more thoroughly while simultaneously increasing lifespan; adding DEF can make diesel run better or increase its lifespan, but can increase weight.

Weather can significantly affect how much a gallon of diesel weighs, as warmer climates cause it to dilute further, leading to reduced specific gravity and API, thus making the product weigh less than usual.

Truck drivers transporting large volumes of diesel fuel require knowing its weight in gallons to plan their routes and ensure enough power is available for their journeys. Furthermore, this information allows them to calculate their load limit to ensure no exceeding of it during weight checks.


The weight of diesel fuel depends on several variables. Weather changes, in particular, may alter its density and, therefore, its weight; different kinds of diesel have other properties and thus vary significantly in importance. As an approximate rule of thumb, a gallon typically weighs around 7 pounds, depending on conditions and the type of diesel used.

Different varieties of diesel fuel each have unique properties that affect their density, giving each type a distinct weight. For instance, 1D or Number 1 diesel is thinner than other fuel types with lower viscosity levels. It is suitable for cold weather conditions and found in tractors, off-road vehicles, and home heating oil applications – typically dyed red to distinguish it from regular diesel.

Temperature also affects the weight of diesel fuel, as its density increases as temperatures get colder; when temperatures warm up again, its density decreases, and so will its weight. Truck drivers must monitor this information to stay within their DOT-approved vehicle weight limits and underweight regulations.

Knowing what a gallon of diesel weighs can be invaluable to truck drivers when fueling at gas stations, enabling them to avoid fines for exceeding weight restrictions and calculating their fuel efficiency requirements accurately. Furthermore, this information allows them to ensure their vehicles are appropriately loaded for safety and efficiency.