Well if you post some pics we might be able to help you better but without looking we could not even begin to guess. Even with pics... it's just a "guesstamation" because yield also depends very much on weight. Your weight will depend on a lot of factors. denseness, how it it dried. etc. I have seen plants put out a lot of volume but it was "airy" and obviously weighed very little....
good luck!
Elway