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Twin XL mattress dimensions

Twin XL is 38 by 80 inches in this US nominal profile.

Published by BedFit Atlas · Updated 2026-10-20

Dimensions at a glance

US · Nominal bed dimensions
Size	Width (in)	Length (in)	Area (sq ft)
Twin XLReviewed 2026-09-18	38	80	21.1

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1. Twin XL

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Twin XL is 38 by 80 inches in this US nominal profile. Compared with the cited Twin, its listed length increases by 5 inches. Check the width in the table as well: the XL label describes this profile, not a universal rule for every product. Extra length matters at the foot of the bed, where a doorway, drawer or desired passage can limit the layout. A Twin-labelled frame or fitted sheet should not be assumed to fit. Enter the outside frame dimensions in the room calculator if you have them; otherwise the result covers the mattress footprint only. The calculator checks both orientations and includes your selected clearances and nightstands. Confirm actual product specifications before ordering, especially where a manufacturer publishes a different nominal width.

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Sources and review dates

Data reviewed 2026-09-18.

Bed Sizes and Mattress Dimensions: Guide + Comparison Chart — Purple Purple, US mattress dimensions guide; selected nominal reference values, not product measurements or universal tolerances.
Published room-fit geometry, version 1 — Bed Dimensions