December 17, 2019
Filed under: Mattress Guide

Twin size mattresses are built to industry standard dimensions. Twin beds are approximately 38 inches wide by 75 inches long. Another type of twin mattress, Twin XL are about 5 inches longer measuring 38×80. Use the table below to compare mattress sizes.

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

National Sleep Foundation’s logo, name, materials and/or insights used under license from NSF in exchange for Serta’s financial support of NSF’s sleep research and educational activities.

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