I think it’s really hard to reduce to an equation. Our troop collected about 4,500 items last November and delivered them to the pantry at a local church. They hold a monthly dinner where they also hand out shopping bags of food, and expected that our donation would last through the winter. It all depends on who shows up in need and how deep that need is.
They do have some metrics on their web site though:
- Average 110 meals served per night
- Total in 8 full years = nearly 14,000 meals served
- Average volunteers needed nightly 55
- Estimated total volunteers in 8 years = 6,450
From that, you can extrapolate - 4,500 items covers 110 meals x 4 months (440 meals), or about 10 items used or given away (mostly the latter) per meal delivered.
Of course, your mileage may vary.