Mattress Sizes: Twin

Mattress Sizes: Twin

December 17, 2019

Author: Lisah

Twin mattresses are ideal for kids’ bedrooms, or rooms where bunk beds or daybeds are used. Serta produces a wide variety of twin mattresses featuring both innerspring and all-foam support systems. Twin mattresses are often referred to as “single” mattresses.

A Serta twin mattress measures approximately 38″ x 74.5″. These measurements can vary by +/- 1/2″. Size availability varies by product and retailer. Mattress heights vary by product, so please see your retailer for information on specific model height.

Serta also produces Twin XL mattresses, which measure approximately 38″ x 79.5″. Twin XL mattresses are often used in college dorms and hospitals.

Width x Length

Standard Size

38″ x 74.5″


38″ x 79.5″

Twin XL

53″ x 74.5″


60″ x 79.5″


76″ x 79.5″


72″ x 83.5″

California King