How do you measure the amount of propane in a tank if you don't have a gauge?

Answer 1

by first weighing the tank when empty, then a 20 lb tank will weigh 20lb plus the empty weight when full. . so if the tank weighs 15 lb empty and now weighs 25 lb , then it is half full , or half empty !!!!!!!!!!!!

Answer 2

As you use it, moisture will form below the fuel level line. You can also slosh it around and get an idea of how much is in it. You can also weigh it on a bathroom scale if you know the empty weight.

Answer 3

Yes open the valve away from an open flame or any heat source. Or tap on it with something heavy. An empty tank will make a DING sound while a full one would make a DONG sound. Try it out at the store you'll be able to tell the difference.