One gallon the propane weighs 4.2 pounds. A “full” 20 lb cylinder should have 4.7 gallons or propane in it. The many common means to measure it is by gallons. That can additionally be measure up by pounds (one gallon = 4.2lbs). Once measured in gallons, a meter in ~ the pump is provided to determine the quantity of propane that has actually been filled right into a tank. When measured in pounds, the tare (empty starting) weight of the tank have to be well-known first.

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All propane tanks have actually a “tare weight” or “T.W.” stamped ~ above the collar the the tank. For a grill size tank you just calculate the tare weight + 20 lbs, and that’s how much the tank need to weigh once it’s full. Many 20 lb tanks have a tare weight of +/- 17 pounds when totally empty. This way a “full” propane tank have to weigh about 37 pounds.

There is likewise a month and also year ~ above the collar describe the day the tank was made. For 20 lb propane tanks, you have 12 year from the to produce date before the tank must be re-certified through a brand-new date stamped top top it. The re-certification just adds 5 years before having come re-certify again. The cost and also inconvenience that re-certifying nearly always outweighs the price the a brand-new tank.

Brand new propane tanks might come with air inside and also need to it is in “purged” prior to the an initial fill. Some more recent tanks, prefer Bernzomatic, will have a sticker ~ above them saying they don’t should be purged in ~ 6 months of the produce date.

Purging needs a unique adapter to allow a tiny amount the propane in. The push then pushes air the end of a one-way bleeder valve. Purging may add another $3-4 dollars to a new tank, despite some locations don’t charge, specifically if friend buy the tank native them.

1 gallon that propane weighs 4.2 pounds

A “full” 20 lb cylinder should have 4.7 gallons or propane in it

These “20 lb” tanks space designed to take up to 20 pounds that propane. Friend may get a pound or 2 less, depending on the temperature of the tank and surrounding air once the tank to be filled. Cooler = more propane in, hot = much less in. Tanks deserve to actually fit an additional 20% in the tank, yet that extra space is designed for expansion as the temperature rises.

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In an extremely cold winter climates, prefer Canada, there might be an ext concern/rules around filling a tank to a finish 20 lbs. This is due to the fact that if you leave a tank outside in an extremely cold temps, filled the tank once the tank is cold, and then bring it into a warm basement/garage for a room heater, the gas will increase as the tank warms. With enough of a temperature increase, the tank’s push relief worth will relax a bit of gas. This is less of an worry if the relief value is bleeding to external air.


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