how much does a propane tank for a grill weight
Weigh it. Most propane tanks weigh around 18.5 pounds when they are empty. Place your tank on a household scale and subtract 18.5 from that number and you can determine how much you have left. An average size (500 sq in) grill will use about a pound and a half of propane an hour cooking medium to high so you can have a sense of how much longer you can cook from that.