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The only accurate way to measure the propane left in a propane tank is to weigh it. The following are the steps needed to find the amount of propane left in a propane tank and to approximate the length of time it will take to burn the propane in a given appliance.
Steps

1Engraved on the side of the tank should be the letters TW then a number. This number is the empty tank weight. For example, the typical 5 gallon (18.9 L) propane tank might say TW 17.2. The weight of the empty tank in the example is 17.2 lbs.

2Weigh the tank on a bathroom scale to find the total current weight. Let's say that the current weight of the tank is 24.2 lbs.^{[1] X Research source }Advertisement

3Subtract the tank weight from the total weight to find the weight of the propane. 24.2 lbs  17.2 lbs = 7 lbs.^{[2] X Research source }

4Each pound of propane contains 21,600 BTUs.^{[3] X Research source } Multiply the number of pounds by the number of BTUs contained in each to get the total number of BTUs remaining in the tank. 7 × 21,600 ≈ 151,000 BTUs.

5Find the BTU output of the appliance in question. These can often be found on manufacturers web sites. For example a propane grill may burn 12,000 BTUs an hour. To find the remaining running time for the grill divide 151,000 by 12,000. 151,000 ÷ 12,000 ≈ 12.6 hours of run time.

6For easy future reference. divide 12.6 hours by the aforementioned 7 lbs to get 1.8 hours of grill run time per pound of bathroom scale measured propane.Advertisement
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QuestionHow much does a full canister of propane gas weigh?Community AnswerMost canisters contain 20 pounds and weigh 17 pounds when completely empty. A full canister would contain 37 pounds.

QuestionI have a propane cylinder that has written on it in large letters "11kg", but I have weighed the cylinder and it's 20 kg. Is there 9 kg of propane left?Community AnswerIf the "11kg" appears after "TW" (for tare weight), then you are correct. The tare weight is the weight of the tank when empty.

QuestionHow many pounds does it take to make a gallon?Community AnswerYou cannot convert pounds to gallons unless you know the density of the liquid. Let's assume you have a pound's worth of a solution, and this solution weighs one fourth of a pound for every quart. Convert the pounds to quarts and convert the quarts to gallons.

QuestionHow do I convert pounds to gallons for propane?Community AnswerFirst, find the name of the compressed gas you want to convert. If you know the quantity in pounds, multiply by the number in Column A 3. If you know the quantity in gallons, multiply by the number in Column B 4.

QuestionHow old is my propane tank?Community AnswerThe age can be determined by the hydro date stamped on the tank collar. All gas cylinders are hydro tested at manufacture.
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Warnings
 One should always be careful when dealing with contents under pressure and or flammable substances.Thanks!
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