Space ratio: The enclosed space (cubic feet) per passenger on the ship.

Example:30000/1000=30 cubic feet

Where 30000 is Ship Size expressed in Gross Tonnage and 1000 is the passenger capacity on ship.

Note: Space ratio does not necessarily correlate with stateroom size. Ships can have small staterooms but very large public areas, yielding a higher space ratio number.
The higher the ratio, the more passengers will have a sense of the ship's roominess.