In Singapore, mattress sizes generally follow standard dimensions that are similar to those used internationally, but there can be some variations. Here are the common mattress sizes in Singapore:

1. Single: 91 cm x 190 cm (36" x 75")
2. Super Single: 107 cm x 190 cm (42" x 75")
3. Queen: 152 cm x 190 cm (60" x 75")
4. King: 183 cm x 190 cm (72" x 75")
5. Super King: 203 cm x 203 cm (80" x 80")

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. Additionally, some retailers may offer custom sizes to fit specific needs or bed frames.