I see on some seed banks where they tell the yield on plants. I think the best to calculate your yield would be to look on these sites at each strain you have and most will say yield, indoor/ outdoor. They measure in grams so take out your phone and use the unit converter to convert grams to pounds. Then you got an estimated idea anyway. I may be wrong , I am a new grower after all, if I am someone will correct me or call me an idiot lol, either way , thats what I would try.