Got back from a long holiday to find my harvest.of black turtle beans nice and dry ready for disenbeaning. I'll post the number for our ROI once they're all shelled.
~5000 beans from 50 planted beans so 100 bean ROI. 1.2kg all up
@damianpeterson interesting! What sort of area did 50 bean plants occupy? And are these climbing or dwarf beans?

(I have some climbing and runner beans I'm growing for drying this year, and I'm starting to get into running the numbers on how much back yard I'd have to devote to get close to what I actually eat every year...)

@stephen The area is approx 1.2m x 1.2m. I bought the beans from Binn Inn and it turns out they were climbing beans (I was unprepared for this). Next year I'll be filling the other half of the raised garden with soil and will do it again in this section but this time with better supports.

We usually use 3/4 cup of beans for a rice and beans meal so only 8 full meals from this harvest.

@stephen Next time I'd plant less and have better support. But, yeah, we don't really have enough space to live off the land here.