It just depends.
On the species.
The soil on which it is grown / ph values.
Available nutrients / ec. values.
Inside or outside.
How much lumen are put on the chlorofyl for photosynthesis.
And loads more!
Some grower here had this plant, it was called "Grapefruit".
Grown outside, next to a pond. It yielded 1.2 kilo. DRY!
The stem was fatter then a coke can, it was not even a meter high,
and it was over 1.2 square meters in diameter
This was during a good summer.
Inside, a seedling put into 12 / 12 cycle right away, depending on the species and other variables:
20 - 40 grams of dry clean cannabis.
Put that seedling into a photo cycle of 16 / 8 or 24 / 0 or whatever for a long time,
make it grow to the heavens, then the sky is the limit
Knock yourself out.
One can never tell you how much can be harvested from one plant, ever
EDIT:
What i would like to add is this;
a rough estimate can be made, and always is made by seed companies for example.
So, in theory one can make an estimate, not per plant but per square meter.
But still, there is a margin of about 30% - 40%.
So, is that really accurate enough? Because i don't think so.