Unlike many other ships in the Holland America fleet, Westerdam casts its line into a slightly younger demographic by offering significantly more entertainment options after sundown, like the varied live music performances shipwide, and slipping into a more casual atmosphere, as opposed to the more traditional experience of other HAL ships.
| Cruise Line | Holland America Line |
| Builder | Fincantieri |
| Entered Service | 2004 |
| Registry | Netherlands |
| Length (ft) | 285 |
| Beam (ft) | 32 |
| Draft (ft) | 8 |
| Tonnage | 82305 |
| Cruise Style | Premium |
| Size | Mid-Size |
| Passenger Decks | 11 |
| Cabins | 1709 |
| Total Crew | 820 |
| Max. Passengers | 1916 |
| Passenger/Crew Ratio | 1 : 0.4 (#172 of 358) |
| Passenger/Space Ratio | 1 : 43 (#84 of 262) |