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Check Your Propane Tank With Simple Math
If you feel like breaking out your math skills before your next barbecue, you can check your propane tank’s level with some basic math.
This method works best for smaller tanks, like those used for portable grills or camping appliances, but it can give you an accurate reading for any tank if you’re willing to do the calculations.
First, take the weight of the total amount of propane your tank can hold (typically 20 pounds) and divide that by 4.2 to convert the weight to gallons.
Next, figure out how many BTUs per hour your grill typically consumes. You typically can find this either marked on the side of the grill or in your user’s manual.
Then, find the maximum BTUs per hour your grill would consume if all of the burners were turned to high — this is the number we’ll be using in our equations.
One gallon of propane gas produces around 92,000 BTUs, so if you have a typical 20-pound tank, that’s 4.76 gallons or 438,000 total BTUs that your tank can produce when full.
If your grill’s maximum BTUs per hour is 30,000, divide 438,000 by 30,000 to find the total amount of cooking time your tank can provide. In this instance, that equation gives us 14.6, which means your tank can handle between 14 and 15 hours of cooking time.
That answer is, of course, the total cooking time your tank can provide if your grill is on full blast. If you only plan on cooking on half heat, multiply 14.6 by two — at that level, your tank can provide 29.2 hours of cooking time.
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