Propane Tank Size Chart – Never Pick the Wrong One Again

Propane Tank Size Chart

It’s not easy to know the heating output of a propane tank unless you know the actual tank size. The size determines the amount of propane a tank can hold, which also translates to the BTU levels to expect. The propane tank size also determines how long the propane lasts, helping you decide the best option for residential or commercial use.

Key Takeaways: 

  • A 500-gallon propane tank can last a maximum of 14 months, with many residential tanks lasting an average of 5 months.
  • To know the size of your propane tank, you’ll need to measure its diameter, height, width, and length.
  • A 100 lb propane tank can hold at least 24 gallons.

This article contains a chart showing common propane tank sizes, their dimensions, and the amount of propane each tank holds. We will also look at the gallons in a 100 lbs propane tank, how to determine propane tank size, and how long a 500 gallons tank lasts. 

What are the Different Types of Propane Tanks?

Propane tanks come in different sizes, all geared to different use. They range as follows:

  • Propane bottles – these are cylinders measuring 1, 2, and 3 lbs.
  • Small propane tanks – the cylinders range from 5 to 20 lbs. 
  • Standard propane tanks – the range between 25 and 420 lbs.
  • Residential propane tanks – the cylinders hold between 100 and 2,000 gallons.


What Are the Different Propane Tank Sizes?

Propane tanks come in different sizes, each weighing differently and containing a specific amount of propane. We have created a chart highlighting all these to help you make the right decision. Although there are many propane tanks, we have focused on the five commonly used tanks, and they include:

Propane tank size

(gallons.) (but the last two measure in lbs)

Propane tank weight when empty (pounds.) Propane content


Propane tank dimensions


100 gallons 212 lb 80 gallons 50x28x28 Inches
250 gallons 483 lb 200 gallons 92x30x30 Inches
500 gallons 949 lb 400 gallons 120x37x37 Inches
20 lbs 13.5 lb 16 lb 18x12x12 Inches
100 lb 67 lb  80 lb 48×14.5×14.5 Inches

Remember, the last two items show propane tank size in pounds rather than gallons.


How Many Gallons Are in a 100 LB Propane Tank?

A 100 lb propane tank can hold approximately 23.5 gallons of propane. That is based on the rough estimate that one gallon of propane weighs 4.24 pounds.

It is important to note that this is just a rough estimate, and the amount of propane that a 100 lb propane tank can hold may be slightly different due to variations in the density of the propane.

The propane is for residential use like grills, driers, or fireplaces.

Related: How Does a Propane Refrigerator Work? A Complete Guide


How Do You Determine Propane Tank Size?

Propane cylinders are spherical, making it challenging to know the actual size. However, you can follow these steps to know the size of your propane tank:

  1. Measure the diameter
  2. Measure the length of the tank from one end to the other.
  3. Measure the height and leave out the base and stand
  4. Compare the measurements with ASME


Measure the Diameter

To measure the diameter of the propane tank, start by lying the tank horizontally on the ground. Take a tape measure and measure across the base of the tank. Note these measurements and proceed to the next measurement.

Related: Propane vs. Gas Generator: Which is Right For You?


Measure the Length From End to End

Use the same tape measure and measure the tank from end to end. Note the length measurements down.

Measure the Height Leaving Out the Base and Stand

The base and stand don’t account for the actual height of the propane tank, and you should leave them out. Only focus on the part of the tank that contains the propane. 


Compare the Measurements With ASME

The American Society of Mechanical Engineers (ASME) shows the actual propane tank measurements. It comes in handy when trying to figure out the type of propane tank you have. You can use this information to determine how much propane is in your tank and how long it will likely last. 


How Long Will 500 Gallons of Propane Last?

On average, a propane tank should last a minimum of 2 months and a maximum of 14 months. However, the actual period a 500 gallons propane tank lasts depends on how often you use it. The more you use it, the faster it will run out. On average, a 500 gallons propane tank should last five months with moderate use.


Propane Tank Sizes and Prices

The different propane tanks’ sizes have different prices. To educate our readers, we have covered the following propane tanks:

  • 120-gallon propane tank – between $630 and $700
  • 100-gallon propane tank dimensions – between $380 and $650
  • 500-gallon propane tank dimensions – between $1,630 and $1,700
  • 20 lb propane tank dimensions – $35

The total cost could vary based on the model and additional costs like shipping and storage.


Bottom Line

Propane tanks come in different sizes. They also hold different quantities of propane. Knowing the size of your propane tank helps you determine how long it’ll last. Start by measuring the propane tank’s diameter, length, and height.

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