Well, I did both of those...
First of all, I have a family of 7 (Me and my three kids and my DH and his two kids - only needed one more boy to make the brady bunch, lol) and we eat meat every day - though much of it we grow ourselves... and we have plans to make us pretty self-sufficient food-wise starting as soon as the snow melts this spring. OK I guess I just have to share - we bought a piece of land this fall, 5.5 acres and put the money aside to build a barn first, a 60x100' garden and then as soon as our house sells, we'll be living in a camper till we get our new one built. I can't wait - we're living in an 1100 sf 3 bedroom, 1 bath house right now - talk about a tight fit! Anyways, back on topic...
I was very surprised how high the first calculator was:
76 for us - national avg is 190 - world avg is 39
Second calculator gave me 16.32 tons