One gallon that propane weighs 4.2 pounds. A “full” 20 lb cylinder should have 4.7 gallons or propane in it. The most common method to measure it is by gallons. It can likewise be measure up by pounds (one gallon = 4.2lbs). When measured in gallons, a meter at the pump is used to identify the lot of propane that has been filled into a tank. As soon as measured in pounds, the tare (empty starting) weight of the tank need to be known first.

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All propane tanks have a “tare weight” or “T.W.” stamped on the collar the the tank. Because that a grill sized tank you merely calculate the tare weight + 20 lbs, and that’s just how much the tank have to weigh when it’s full. Most 20 lb tanks have actually a tare weight of +/- 17 pounds when completely empty. This means a “full” propane tank should weigh around 37 pounds.

There is additionally a month and also year top top the collar describe the date the tank was made. Because that 20 lb propane tanks, you have 12 year from the manufacture date before the tank need to be re-certified v a brand-new date stamped top top it. The re-certification just adds 5 years prior to having come re-certify again. The cost and also inconvenience of re-certifying almost always outweighs the price of a brand-new tank.

Brand brand-new propane tanks might come v air inside and also need to it is in “purged” before the very first fill. Some newer tanks, favor Bernzomatic, will have a sticker top top them saying they don’t must be purged within 6 month of the to produce date.

Purging needs a one-of-a-kind adapter to permit a tiny amount of propane in. The push then pushes air the end of a one-way bleeder valve. Purging may include another $3-4 dollars to a brand-new tank, though some places don’t charge, specifically if friend buy the tank indigenous them.

1 gallon the propane weighs 4.2 pounds

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

These “20 lb” tanks room designed come take as much as 20 pounds of propane. Girlfriend may get a pound or 2 less, depending upon the temperature that the tank and also surrounding air as soon as the tank to be filled. Cooler = more propane in, hotter = much less in. Tanks have the right to actually fit one more 20% in the tank, yet that extra room is design for development as the temperature rises.

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In very cold winter climates, favor Canada, there may be an ext concern/rules around filling a tank to a complete 20 lbs. This is since if you leaving a tank outside in really cold temps, fill the tank once the tank is cold, and also then carry it right into a hot basement/garage because that a space heater, the gas will expand as the tank warms. With sufficient of a temperature increase, the tank’s push relief worth will relax a bit of gas. This is less of an concern if the relief worth is bleeding to external air.


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