In Canada, mattress sizes generally follow standard dimensions similar to those in the United States. Here are the typical mattress sizes available in Canada:

1. Twin (Single):

- Dimensions: 38 inches x 75 inches (96.5 cm x 190.5 cm)

- Best for: Children, small spaces, and bunk beds.

2. Twin XL:

- Dimensions: 38 inches x 80 inches (96.5 cm x 203.2 cm)

- Best for: Taller individuals, college dorms, and small spaces.

3. Full (Double):

- Dimensions: 54 inches x 75 inches (137.2 cm x 190.5 cm)

- Best for: Single sleepers who want more space, and smaller guest rooms.

4. Queen:

- Dimensions: 60 inches x 80 inches (152.4 cm x 203.2 cm)

- Best for: Couples, average-sized master bedrooms, and guest rooms.

5. King:

- Dimensions: 76 inches x 80 inches (193.1 cm x 203.2 cm)

- Best for: Couples who want more space, larger master bedrooms, and families with pets or children who co-sleep.

6. California King:

- Dimensions: 72 inches x 84 inches (182.9 cm x 213.4 cm)

- Best for: Taller individuals, couples who want more length, and larger master bedrooms.

These sizes are standard, but there can be slight variations depending on the manufacturer. When shopping for a mattress, it's always a good idea to measure your space and consider your specific needs to ensure the best fit.