For me, and for mine, it's a simple 1/4 tsp (teaspoon) level per pound of my chosen meat.
It's simple, and it slides right along with using standard kitchen measuring tools for the other spices and items being blended into the mix. (A tsp of this, a TBLS of that, a cup of this, or a 1/2 cup of that.....)
I was highly technical in my work, but for my Bar-B-Que, simple and easy does it.
So far, so good. Nobodies died yet. At least, not from anything traceable to me.... :rolleyes::eek::confused::D:p