How to Check if a Propane Tank Is Empty
If your grill suddenly loses heat or stops working, the propane tank may be empty. Fortunately, there are several simple ways to check how much propane is left in your tank.
Most backyard grills use standard 20 lb propane cylinders, which typically last about 18 to 20 hours of cooking time depending on the heat setting.
Quick answer: You can tell if a propane tank is empty by using the hot water test, weighing the tank, checking a propane gauge, or noticing weak grill performance.
1. The Hot Water Test
The hot water test is one of the quickest ways to estimate propane levels.
- Pour warm water down the side of the tank
- Wait a few seconds
- Run your hand down the outside of the tank
You will usually feel a cool spot where the propane level begins. That temperature change helps reveal roughly how much propane remains inside the tank.
2. Weigh the Propane Tank
Another way to check propane levels is by weighing the tank. Most propane cylinders have a tare weight (empty weight) stamped on the collar.
For example, if the collar says TW 18, the empty tank weighs about 18 pounds.
A full 20 lb propane tank usually weighs around 37 to 38 pounds.
If the tank weighs close to its tare weight, it is likely almost empty.
3. Use a Propane Tank Gauge
Propane gauges attach to the tank valve and measure pressure levels. These gauges can provide a quick estimate of how much propane remains.
While gauges are convenient, they are not always perfectly accurate because propane pressure can vary depending on outdoor temperature.
4. Monitor Grill Performance
If your grill struggles to reach cooking temperature or the flames appear weak, the propane tank may be nearly empty.
Many grill owners keep a spare propane tank on hand so they can quickly swap tanks when one runs out.
When to Replace or Exchange Your Propane Tank
If your propane tank is empty, the easiest option is usually to exchange it at a nearby retailer.
Many stores offer outdoor propane exchange cages where you can swap your empty cylinder for a prefilled one in just a few minutes. You can see common locations in our guide to propane tank exchange near you.
If you want to compare pricing before exchanging your tank, see our guide to propane tank exchange cost.
If your tank is older, you may also want to check whether it is still within its certification period. See our guide on do propane tanks expire.
Frequently Asked Questions
How do I know if my propane tank is empty?
You can check if a propane tank is empty using the hot water test, weighing the tank, using a propane gauge, or noticing weak grill flames. These simple methods help estimate how much propane remains in the tank.
How much does a full 20 lb propane tank weigh?
A full 20 lb propane tank usually weighs about 37 to 38 pounds. The tank itself typically weighs around 17 to 19 pounds when empty, which is known as the tare weight stamped on the tank collar.
How long does a 20 lb propane tank last?
A 20 lb propane tank typically lasts about 18 to 20 hours when used with a standard backyard gas grill. Actual usage depends on the grill’s heat setting and how long you cook.
Conclusion
There are several easy ways to tell if a propane tank is empty, including the hot water test, weighing the tank, or using a propane gauge. Checking your propane level regularly can help you avoid running out of fuel while grilling or cooking outdoors.