How Much Does a Gallon of Oil Weigh?

A gallon of oil is about volume, not weight. The weight changes depending on the type, density, temperature and other factors. A gallon is how much space is taken up, not how heavy it is. Different oils, even at the same volume, will weigh different amounts per gallon. A gallon of water is heavier than a gallon of motor oil at room temperature.

To know how much a gallon of oil weighs, you need to know the type and density. Equivalents like pounds (lbs) and kilograms (kg) can help convert gallons to weight. Knowing these approximations helps understand what one gallon means in terms of weight for a given type of oil.

A gallon of oil is a unit used for measuring volume and weight of a liquid. It’s commonly used for measuring fuel, lubricants and other liquids sold in barrels or drums. A US gallon has a weight of 7.2 pounds (3.2 kg). A UK imperial gallon holds 10 pounds (4.5 kg) at standard temperature and pressure conditions.

The density of oil affects how much it weighs within the same volume. For instance, crude oil has a higher density than motor oil. Therefore, it weighs more but takes up less space per gallon. Motor oils intended for high performance engines are heavier and more expensive than lighter fluids like engine coolants or solvents. Fuel prices may change depending on the type and quality of oil you buy.

What is the Weight of a Gallon of Oil?

Do you know the weight of a gallon of oil? It’s important for shipping, handling and storage. Depending on the type, the weight can be different. Let’s explore the weight per gallon of various oils like gasoline, veggie oil, motor oil, olive oil and more!

Factors Affecting the Weight of Oil

A gallon of oil’s weight can differ. Usually, it weighs near 7.2 lbs (3.26 kg). This count shifts depending on factors like oil’s viscosity and density. High viscosity oil needs more push to move and so is much heavier than low viscosity oil. Also, heavier oils are denser than lighter oils.

Temperature has an effect too. Colder temperatures make some types of oil thicker and heavier. Hotter temperatures may increase volume without much change in density. Lastly, the container you measure in impacts the measurement. Drums with less volume than one full gallon lead to discrepancies due to air spaces.

What Is the Weight of One Gallon of Engine Oil

The Average Weight of a Gallon of Oil

It’s not simple to weigh a gallon of oil. Many different kinds and grades of oil have different densities. Generally, a gallon of oil weighs 6.84-7.50 lbs (3.1-3.4 kg). This is based on its viscosity (measured in Saybolt Universal Seconds, or SUS), and temperature in Fahrenheit (°F).

Commonly used commercial oils have SUS 30-300, and temperatures 70-90°F (21-32°C). This gives a density of 0.917-0.981 lbs/gal (7.55-8.05 kg/m3).

Lighter synthetic oils, such as turbine oil, weigh less than 6 lbs per gallon (2.72 kg/m3). Heavier lubricating oils, like engine oil, are 7-8 lbs per gallon (8-9 kg/m3). Viscosity of 10W30 or 5W20 engine oil at temperatures over 90°F (32°C) up to 150°F (66°C) is around 7 lbs per gallon (7.71 kg m3). Heavy-duty American Petroleum Institute-certified engine oils with viscosities between 15W60 or 20W50 and temperatures for high-efficiency internal combustion engines (>220°F /105°C) weigh 8-10 lbs per gallon.


A gallon of oil can have different weights, depending on its type and density. Usually, it’s 7.3 lbs or 3.3 kg. It can be lighter, though – up to 6 lbs per gallon. Volume measurements for all oils remain constant. So, 1 liter of motor oil always has the same weight. That makes it easy to calculate precise amounts for personal use.


Q: How much does a gallon of oil weigh?

A: A gallon of oil typically weighs around 7.5 pounds or 3.3kg.