The Occupancy (OCC) Free Up Ratio is a metric used in Inventi-Flow to measure how effectively reservation allocations are optimized to create longer gaps between bookings, aiming to increase overall occupancy. For instance, if a period of 2-4 weeks has many 1-night gaps, it restricts longer stays. After optimization with Inventi-Flow, these gaps are adjusted to allow for longer reservations. The Free Up Ratio represents the additional occupancy percentage possible due to these longer gaps, showing the increased potential for accommodating extended stays over the optimized period.