A commercial Bun pan is 18" x 26" (outside measurement), and because they are tapered for nesting or making them stackable, the inside measurement is 16.5" x 24.5".
A commercial full sheet is 16" x 24". They are baked in 16" x 24" bakeable cardboard trays that fit into the Bun pans (flat surface portion) which are used during baking for support and handling purposes.
A true commercial full sheet (16" x 24") serves 96 (unit wt. 106-124 oz.).
If this size pan doesn't fit in your oven, and you are baking two 12" x 18" (54 serving) half sheets, they would serve 108 total.
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