Just to map out the problem space: https://www.waldeneffect.org/blog/Calories_per_acre_for_various_foods/ https://www.waldeneffect.org/blog/Calories_per_acre_f

Just to map out the problem space: https://www.waldeneffect.org/blog/Calories_per_acre_for_various_foods/ https://www.waldeneffect.org/blog/Calories_per_acre_for_vari... https://www.quora.com/What-crop-including-tree-crops-produces-the-most-calories-per-acre https://www.quora.com/What-crop-including-tree-crops-produce... Most peoples' gardens aren't exclusively growing staple crops, so some land would need to be set aside for nutritional completeness. Calories/acre isn't a complete picture; root vegetables require less processing than grains. In a "collapse of supply chains" situation, that needs to be included. If you're using them to supplement sunlight, the electricity required depends on your local climate, efficiency of your lights, etc. I've found that the most readily available data on that is from marijuana enthusiasts, amusingly.