How many calories would be in a slice from a 6 foot sub.

I don't man a 6 inch sub I mean 6 FOOT. I went to a party today and they had 3 foot and six foot subs. I had one slice which was aproximatly 3 inches wide and as deep as the bread.

It consisted of bread, roast beef, tomatos, lettuce and onions and some sort of dressing.

I'd look up Subway's roast beef subs and count half of their six inch sub