Mattress Size Guide
The label on a mattress is only the starting point. Check the actual product dimensions, foundation, doorway and usable room space before you order.
Common North American mattress dimensions
| Size | Typical dimensions | Often suits |
|---|---|---|
| Twin | 38 × 75 in | One child or compact single-sleeper room |
| Twin XL | 38 × 80 in | Taller single sleepers and dorm rooms |
| Full / Double | 54 × 75 in | One sleeper wanting width; compact guest rooms |
| Queen | 60 × 80 in | Many couples and primary bedrooms |
| King | 76 × 80 in | Couples prioritizing personal space |
| California King | 72 × 84 in | Taller sleepers who can trade some width |
Dimensions are common conventions, not a guarantee. Measure the specific model; tolerances and regional sizing vary.
Measure the room, not just the old mattress
- Mark the proposed mattress outline on the floor with painter’s tape.
- Leave comfortable paths to doors, drawers and closets.
- Measure stair turns, elevators and door openings for delivery.
- Add the foundation and frame height to check the final sleeping height.
- Confirm the frame’s internal dimensions and center-support requirements.
Allow for bedding and real use
Deep mattresses need deeper fitted sheets, and thick duvets require clearance near walls and furniture. Couples should consider sleeping width per person, not just whether the mattress technically fits the room. Split foundations can make a king easier to deliver, but the mattress itself must still reach the bedroom.
Next: compare platform frames and box-spring support, or return to the main mattress buying guide.