How much ground allspice is equal to 1 tablespoon whole allspice?

Well, honey, 1 tablespoon of whole allspice is equal to about 1.5 teaspoons of ground allspice. So if you're in a pinch and need to swap 'em out, just remember that little conversion and you'll be good to go. Just don't go sprinkling it on your pumpkin pie thinking it's cinnamon – that's a whole other story!