In New Zealand, mattress sizes typically follow standard dimensions similar to those used in other countries, but they may have slight variations. Here are the common mattress sizes in New Zealand:

1. Single: 92 cm x 188 cm (36" x 74")
2. Long Single: 92 cm x 203 cm (36" x 80")
3. King Single: 107 cm x 203 cm (42" x 80")
4. Double: 137 cm x 188 cm (54" x 74")
5. Queen: 153 cm x 203 cm (60" x 80")
6. King: 168 cm x 203 cm (66" x 80")
7. Super King: 183 cm x 203 cm (72" x 80")
8. California King (less common but available): 183 cm x 213 cm (72" x 84")

These sizes are approximate and can vary slightly between manufacturers. It's always a good idea to check the specific dimensions provided by the manufacturer or retailer when purchasing a mattress.