How Much is a Troy Ounce?

How much is a troy ounce? I have never heard of a troy ounce but in my findings a troy ounce is 480 grains. Also, there is 12 troy ounces in a troy pound. That is interesting because in the normal weigh scale there is 16 ounces in a pound. There are many different numbers depending on what you are trying to convert, like stones, carats, grain, drams, calories etc. You can find more information here: