Mattress Size Calculator: Which Bed Fits Your Room?
Enter your bedroom’s dimensions to see which mattress sizes fit while leaving comfortable space to walk around the bed.
Mattress size chart
| Size | Inches (W × L) | Centimetres | Feet | Best for |
|---|---|---|---|---|
| Crib | 28″ × 52″ | 71 × 132 cm | 2′4″ × 4′4″ | Babies and toddlers |
| Twin | 38″ × 75″ | 97 × 191 cm | 3′2″ × 6′3″ | Kids, bunk beds, single adults in small rooms |
| Twin XL | 38″ × 80″ | 97 × 203 cm | 3′2″ × 6′8″ | Tall teens, college dorms, split king halves |
| Full (Double) | 54″ × 75″ | 137 × 191 cm | 4′6″ × 6′3″ | Single adults who want room to spread out |
| Queen | 60″ × 80″ | 152 × 203 cm | 5′ × 6′8″ | Most couples and guest rooms |
| King | 76″ × 80″ | 193 × 203 cm | 6′4″ × 6′8″ | Couples who want maximum personal space |
| California King | 72″ × 84″ | 183 × 213 cm | 6′ × 7′ | Tall sleepers and longer, narrower rooms |
| Split King | 76″ × 80″ | 193 × 203 cm | 6′4″ × 6′8″ | Couples with different firmness needs or adjustable bases |
A split king is two twin XL mattresses side by side. Dimensions are standard US sizes; individual brands can vary by an inch or so.
Mattress sizes compared, to scale
For more detail on each size, including who it suits and how much space a couple gets, read our mattress sizes and dimensions guide.
FAQs
What size room do you need for a queen bed?
A queen mattress is 60 by 80 inches. With about 24 inches of walking space on both sides and at the foot, you need a room of at least 9 ft by 8 ft 8 in for the bed alone; around 10 ft by 10 ft leaves room for nightstands and a dresser.
What size room do you need for a king bed?
A king mattress is 76 by 80 inches. With 24 inches of clearance around three sides, the minimum is about 10 ft 4 in by 8 ft 8 in. Most people find 12 ft by 12 ft comfortable once furniture is added.
What is the difference between a king and a California king?
A king is 76 by 80 inches; a California king is 72 by 84 inches. The California king is 4 inches narrower but 4 inches longer, which suits taller sleepers and longer, narrower rooms.
How much space should you leave around a bed?
Designers usually recommend at least 24 inches (2 ft) on each side you walk around, and 30 to 36 inches where you need to open drawers or wardrobe doors.