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

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



20 lbs.


100 Gallons


500 Gallons


1,000 Gallons


When you compare propane tank prices, size makes the biggest difference. Companies measure 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 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 model than what you need.

There is some inconsistency in the way that manufacturers advertise 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 Tanks for Grills

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

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

Small tanks you need for minimal purposes range from $5 to $700. They usually do not carry additional installation costs since most homeowners can hook them up without much effort.

Price of Large Propane Tanks

The cost to buy a 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