How Much Does a Gallon of Propane Weigh? (Propane Weight Chart)

When it comes to using propane, whether for heating your home, cooking, or powering your vehicles, it’s essential to know how much a gallon of propane weighs. This will help you better estimate your needs and budget and make decisions about storage and transportation.

Propane is a versatile and widely used fuel, but its weight can be a bit tricky to pin down. This is because its weight varies depending on temperature and pressure.

Now that you understand how much a gallon of propane weighs, you can use this information to plan your fuel usage and transportation better. Remember always to handle propane with care and follow safety guidelines to ensure a safe and efficient experience.

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To give you a general idea, a gallon of propane typically weighs around 4.2 pounds in liquid form at 60°F (16°C) and 5 gallons of propane weighs around 21.2 pounds. Keep in mind that this figure may change slightly under different conditions.

Understanding Propane

Propane is an efficient and versatile energy source, commonly used for heating homes, cooking, and fueling vehicles. It’s a type of liquefied petroleum gas (LPG) that is stored under pressure in a liquid form and vaporizes upon release. Propane is colorless, odorless, and has a slightly sweet taste. Its chemical formula is C3H8.

Let’s first look at its specific gravity to give you an idea of propane’s density. The specific gravity of propane is 0.51, which means it is lighter than water (specific gravity of water is 1.0).

This indicates propane will vaporize and rise above the ground when released into the air. However, when it’s stored in a tank, it remains in liquid form due to the pressure.

Now, about its weight: a gallon of propane weighs approximately 4.2 pounds in its liquid state. Of course, this value can vary slightly depending on temperature and pressure conditions.

To calculate the weight of propane in a given tank, you can multiply the tank’s capacity (in gallons) by the weight of one gallon (4.2 pounds). For instance, a 20-gallon propane tank weighs about 84 pounds when full.

It’s important to note that propane tanks aren’t filled to their maximum capacity. Typically, they are filled to 80-85% capacity to allow room for the propane to expand safely due to temperature fluctuations. This means a 20-gallon tank will only hold around 16 to 17 gallons of propane, weighing roughly 67.2 to 71.4 pounds.

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Here are a few facts on Propane:

Boiling Point-44 F
Specific Gravity of Vapor (air = 1.00)1.50
Specific Gravity of Liquid (water = 1.00).504
Lbs. per Gallon of Liquid at 60°F4.20
BTU per Gallon of Gas at 60°F91,502
BTU per Lb. of Gas21,548
BTU per Cu. Ft. of Gas at 60°F2,488
Cu. Ft. of Vapor per Gallon of Liquid at 60°F36.38
Cu. Ft. of Vapor per Lb. of Liquid at 60°F8.66
Latent Heat of Vaporization at Boiling Point BTU/Gallon773.0
Cu. Ft. Air Required to Burn 1 Cu. Ft. Gas23.86
Flash Point-156 F
Octane Number (ISO-Octane = 100)over 100

Weight of a Gallon of Propane

Propane is a versatile fuel used in various applications, from heating homes to cooking. You might have asked yourself, how much does a gallon of propane weigh? Well, let’s find out!

To determine the weight of a gallon of propane, it’s essential to understand its density. Propane’s density is approximately 4.24 pounds per gallon (lb/gal) at 60 degrees Fahrenheit. So, when you multiply the density by the volume (in gallons), you will get the weight.

For example:

  • 1 gallon of propane weighs approximately 4.24 pounds (1 * 4.24 lb/gal).
  • 5 gallons of propane weighs around 21.2 pounds (5 * 4.24 lb/gal).

Keep in mind that propane expands with temperature changes. Therefore, the weight might vary slightly depending on the surrounding temperature.

In various applications, propane is usually stored in cylinders or tanks. Here are some common propane tank sizes and their approximate weights when full:

  • 20 lb tank (holds about 4.7 gallons) weighs roughly 48 pounds (20 lbs. of propane + 18 lbs. for the tank);
  • 30 lb tank (holds roughly 7.1 gallons) weighs about 66 pounds (30 lbs. of propane + 24 lbs. for the tank);
  • 40 lb tank (holds about 9.4 gallons) weighs close to 95 pounds (40 lbs. of propane + 29 lbs. with the tank);
  • 100 lb tank (contains approximately 23.6 gallons) weighs around 193 pounds (100 lbs. in propane + 55 lbs. for the tank).

Now you better understand how much a gallon of propane weighs. Remember that propane weight may vary slightly due to temperature and other factors, so always handle and transport propane cylinders or tanks with care to ensure safety.

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Factors Affecting Propane’s Weight

When you want to know the weight of a gallon of propane, several factors can affect it. Let’s explore these factors so you can have a better understanding of what influences the weight of propane:

Temperature: Propane’s weight can vary depending on the ambient temperature. As propane is a liquefied gas, its density is affected by changes in temperature.

When it’s warmer, the liquid propane expands and becomes slightly less dense, which causes its weight to decrease. On the other hand, when it’s colder, the liquid propane contracts and becomes denser, increasing its weight.

Purity: The purity of propane can also impact its weight. If there are impurities within the propane, such as butane, ethane, or other gases, the overall weight of the propane mixture can change.

Pure propane has a specific density and weight, but other substances, even in small amounts, can alter the overall weight of a gallon of propane.

Measurement Method: How you measure propane weight may also affect the result. There are several ways to measure the weight, such as using a scale to directly weigh the propane container or calculating the weight based on the volume and density of the propane.

Different measurement methods and measurement tools can lead to slight variations in the weight.

Altitude: The altitude at which you are measuring propane’s weight can also play a role. Atmospheric pressure decreases with increasing altitude, which means the propane will be under less pressure, causing it to expand slightly. This expansion changes the density and, consequently, the weight of a gallon of propane.

Measuring Propane Weight

Tools And Techniques

You’ll need a few tools and techniques to measure the weight of a gallon of propane. First, you’ll need a scale that can accurately weigh heavy objects, such as a bathroom or shipping scale.

Place the propane tank on the scale and record the total weight. Then, subtract the tank weight (called tare weight), usually mentioned on a sticker or printed on the tank itself.

To determine the weight of propane per gallon, you can use the fact that one gallon of propane weighs approximately 4.24 pounds. So, if your tank has a capacity of 5 gallons, you can calculate its propane weight using the formula:

Propane weight (in pounds) = 4.24 * gallons in the tank.

Safety Measures

While measuring the weight of your propane tank, it’s essential to follow these safety measures:

  1. Proper handling: Always handle propane tanks with care. Use both hands while lifting and carrying the tank, and ensure a firm grip to prevent dropping or damaging the tank.
  2. Stable surface: Place your scale on a flat, steady, and non-slip surface to get accurate readings and prevent the tank from toppling over.
  3. Never overfill the tank: Be cautious not to exceed its maximum filling capacity, as it can result in hazardous situations, such as leaks or explosions.
  4. Wear protective gear: Use safety goggles, gloves, and proper footwear to protect yourself while handling propane tanks.
  5. Ventilation: Measure a well-ventilated area, away from any sources of heat or ignition, to avoid the risk of fire or explosion.
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By following these safety measures and using the right tools and techniques, you can easily determine the weight of propane in a gallon and ensure safe handling of propane tanks.

Propane Weight Chart

To help you understand the weight of propane per gallon, here’s a Propane Weight Chart for your reference:

GallonsWeight of Gallon (lbs)

The chart above shows the approximate weight of propane in pounds, given the number of gallons. Remember, these numbers may vary slightly due to temperature and pressure.

You might be wondering how this weight-to-gallon conversion works. It’s based on the fact that the weight of liquid propane is approximately 4.24 pounds per gallon.

So, there’s an easy and quick way to convert the number of gallons to its weight in pounds. Multiply the gallons by 4.24. For example, if you have 5 gallons of propane, it would weigh 5 x 4.24 = 21.20 pounds.

Using this chart and method, you can now easily estimate the weight of propane in a tank or cylinder. This can be helpful when planning to transport propane or when you need to know the weight of propane inside a tank for safety reasons.

Remember always to handle propane with care, as it’s a highly flammable substance. Follow all safety guidelines when storing, handling, and using propane to avoid any potential hazards.

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Comparison With Other Gas Weights

When you think about different types of gases, comparing their weights is helpful. In particular, the weight of a gallon of propane may be useful for you to understand in various situations.

A gallon of propane weighs around 4.2 pounds. Compared to other common gases, this is relatively heavy. To help you visualize this weight, here is a table comparing propane to other gases:

GasWeight per Gallon
Propane4.2 lbs
Gasoline6.3 lbs
Diesel7.1 lbs
Methane0.042 lbs
Helium0.012 lbs

As you can see, propane is lighter than gasoline and diesel, but heavier than methane and helium. This information can be useful when considering the energy content, transportation, and storage of different types of gases.

Interestingly, while propane is generally heavier than methane, methane is a more potent greenhouse gas when comparing their global warming potential.

Therefore, even though propane weighs more, it might be a better environmental choice due to its lower impact on the climate. On the other hand, despite being very lightweight, helium is an inert gas with no significant environmental impact or energy content.

About Kevin Jones

My name is Kevin Jones, and I'm the proud founder of this website. I'm a self-professed measurement enthusiast, and I've been passionate about measuring things for as long as I can remember. On this website, you'll find information on all aspects of dimensions, including measurements and weight of stuff.