How Long Does a Propane Tank Last?

The #1 fear for new gas grill owners is running out of propane halfway through a cookout. Understanding how long your tank will last—and how to check it—is essential gear knowledge.

The Short Answer

A standard 20lb propane tank (the size you find at grocery stores) will typically last for 18 to 20 hours of grilling on a medium-sized 3-burner grill. If you use all burners on high, it may last only 10 hours. If you only use one burner, it can last 30+ hours.

How to Check Your Level (Without a Gauge)

If your grill didn't come with a scale or gauge, you can use the Warm Water Trick. It is simple and accurate.

Disconnect the tank from the grill (ensure the valve is closed).
Pour a cup of warm (not boiling) water down the side of the tank.
Run your hand down the side of the tank.
Where the tank feels cold is where the propane level begins. The liquid propane inside absorbs the heat from the water, making the metal feel cold at the fill line.

TIPS to Save Propane

Check for leaks: Use soapy water on the connections to ensure no gas is escaping.
Don't over-preheat: 10-15 minutes is plenty for most grills.
Keep the lid closed: Every time you open the lid, you lose heat and waste gas.

Pro Advice:

The best way to never run out of gas is to own two tanks. When one goes dry, swap it for the spare and go get the empty one refilled that week.

New to gas grilling? Check out our Gas Grill Temperature Guide.