How Much Does it Cost To Fill a 100 Lb Propane Tank on Average?

propane tanks - 100 pound

Table of Contents

Cost of Household Propane Tank Refill

Buying a propane tank starts around $5, with a high of $3,500 and average propane tank prices are somewhere around $800 to $1,000.


Propane Cost

20 lbs.


100 Gallons


500 Gallons


1,000 Gallons



When you compare propane tank prices, size makes the biggest difference when you need a propane refill. Also, how much propane goes into a propane tank depends primarily on the cylinder size. Companies measure propane tank capacity in pounds or gallons.

One gallon of propane weighs a little over 4 lbs. This means that a manufacturer or reseller might label a 420-lb propane tank as a 100-gallon unit. Confirm that you have the right measurement before you buy. A conversion error might result in the purchase of a much larger or smaller propane tank model than what you need.

There is some inconsistency in the way that manufacturers advertise propane tank sizes. For example, a 5-gallon unit might run as a 15-lb or 20-lb model, with the same brand and price. Companies may list a 420-lb size as 100 or 120 gallons. If you are unsure of the size, ask a professional for help.

Cost of Small Propane Tanks for Grills

The best capacity of propane tank depends on your use. One-gallon propane bottles are ideal for people who want to do a little cooking with gas grill while camping or for a tractor supply. Homeowners may prefer propane tank between 5 to 50 gallons to run an outdoor grill or provide fuel for a backup generator.

Smaller propane tank models are generally stationary, with the option to take to a filling station or exchange for a refill. The lesser the propane tank unit, the more often you may go for a propane tank refill. Make sure you feel comfortable safely disconnecting and reconnecting the propane tank.

Small propane tank you need for minimal purposes ranges from $5 to $700. It usually does not carry additional installation costs since most homeowners can hook propane tank up without much effort

Price of Large Propane Tanks

The cost to buy a propane tank of 100 to 120 gallons starts at about $400, rising to $3,500 for 1,000 gallons. Most larger models may require a permanent installation. Bigger units are appropriate for multiple uses:

    • 250 gallons to run a few home appliances
    • 500 gallons for most or all systems in the home
    • 1,000 gallons for larger homes or heavy consumption
Ryan McCabe

Ryan McCabe

Ryan is a home and small business energy expert, having overseen retail propane, heating oil, and HVAC services companies. On ComparePropane, Ryan writes about things that people should know when shopping for or using propane in their homes and businesses. 

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