How big was the slice? The Costco-sized pizza slices are about a 6th of the gigantic 18" diameter pizza, and roughly 800 calories.
A slice of Sbarro cheese pizza, which is more reasonable, is about 460 calories...it's still a pretty big slice.
FitDay defines a "piece" as 1/8 of a 12 inch diameter pizza, and for a thin crust, that'll put you at 160 calories or so.
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