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About 4.1 gallonsPropane is a gas at standard temperature and pressure. A 20-pound tank holds about 4.1 gallons of liquid propane. It's a liquid in the tank because it's under great pressure.

4.2 lb per US gallon

5.1 lb per Imperial gallon

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12y ago
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12y ago

Amounts may varies by temp. But most of the time 4.1 gallon liquid propane.

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12y ago

A 20 pound 'BBQ tank' will contain approx. 4.7 gallons of LPG

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14y ago

If filled with 20 lbs, approx. 4.7 gals If you get it at an exchange, (see label) most only put 15 lbs. = 3.5 gals

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14y ago

4.2 gallons of propane

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14y ago

4.7 approx

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13y ago

4.7 gallons

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14y ago

4.7 approx

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13y ago

out 4.1

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Anonymous

Lvl 1
4y ago

5 gallons

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Q: How many gallons in a 20 lb propane tank?
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