A half rack of baby backs is usually 6 to 7 ribs.
*The Weight Watchers BBQ Cheat Sheet shows a half rack at 46 PointsPlus, and 2 ribs (each thumb's width) at 15 PointsPlus. Yet most restaurant ribs listed in Weight Watchers show a half rack between 14 to 18 PointsPlus. To be safe, we have calculated our ribs at using the values assigned to Outback Steakhouse -- 18 PointsPlus for a full-sized (7 ribs) half rack, which comes to 2.5 PointsPlus per rib.