Can & Jar Size Converter

It's a legacy US can-size designation, not a literal number 2.5 — it refers to a standard 28-ounce (3½ cup) can, a size still common for canned tomatoes and pumpkin.

Mostly close, but not always identical — manufacturers have shifted some sizes slightly over the years (for example, some 16 oz cans are now 14.5 oz). Check the label's ounce count and adjust if it's off by a bit.

A #10 can, the large size used in food service and bulk pantry goods, holds about 109 fluid ounces, which is roughly 13½ cups.