Yeah, those tablespoons are hard to eyeball.
I try all the time...smooshing it down into a tablespoon is tough, so I just eyeball it. I know it takes us about two weeks to go through a tub...usually 2 servings a night...so I guess that about works out to 25 servings...but probably a bit less.
I did find a little shot glass at Wal*Mart that is marked with measurements in tablespoons. That might be more convenient for measuring.