How much propane is left in a tank

How to get rid of dated tanks... take it to a Walmart tank vending machine, swap tanks, and when its empty, swap it at Tank Traders location.

Or you can just pick it up and wiggle it around a little. Some people...

You can also measure the weight of it too...

Just pick it up and wiggle it....

And risk getting blown up.nah ill just pick it up

A tank my parents had when I was growing up had a sticker down the side which showed the capacity when hot water was poured on it.
Just like what was shown here but you did not need to touch the tank.

Poopane tank.

"Propane and propane accessories" H. Hill