The bed size is printed on the mattress label, usually a white law tag stitched into the side seam or bottom edge, and sometimes on the original packaging or the manufacturer's listing.
Mattress Sizing
Where to find the bed size on your mattress?
A mattress law tag lists the size name (Twin, Full, Queen, King) along with fill materials and the manufacturer. If the tag is missing or unreadable, measure the mattress itself. Size names describe width and length, while thickness varies by construction, so a mattress's height does not tell you its bed size.
- A mattress law tag is typically sewn into the side seam or the bottom edge of the mattress.
- The mattress label names the size category, such as Twin, Full, Queen, or King.
- Mattress thickness varies by construction type (foam, innerspring, hybrid) and is not part of the bed size name.
- When a mattress tag is missing, measuring width and length is the reliable way to confirm bed size.