just wondering how to calculate yield

hey there im new to this site & this is my first post,
i was just wondering how to calculate the yeild of my plants one is pure afg the other is unknown, planted in compost soil the unkown is planted in a (roughly) 40-45 liter pot i use root boost and flora-nova following directions watering once a week just finished trimming fan leaves and (accedently ) topped the Afghani (12 liter pot)
the unknown plant is about 2.5 feet tall; the afg is about 1-1.5 foot;
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My calculations indicate 4 lbs...

There's really no way to calculate yield because, there's to many variables strain, genetics, light, nutrients, etc.. But there's no way you'll get 4 lbs at most you'll 4-5 ounces but more likely 2-3 ounces.

When you find a way let me know. I've been doing outdoor for a long time and have yet to come anywhere close to predicting a yield.

On my grow I'm predicting 10-40 pounds and I could still be way off in either direction.

you cut it, trim it, dry it cure it and weigh it, andf that my friend is the only way to calculate yield.

Actually its a matter of experience in my mind, Ive gotten decent at predicting a yeild about 1/2 to 2/3rds of the way finsihed...its impossible to tell at the start of the season.