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Twin mattress dimensions

Twin is 38 by 75 inches in the selected US nominal sizing 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)
TwinReviewed 2026-09-18	38	75	19.8

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1. Twin

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Twin is 38 by 75 inches in the selected US nominal sizing profile. This is the mattress footprint; a frame, headboard or projecting rail can take more space. In a narrow room, measure the clear distance between fixed obstructions before comparing bed labels. The related Twin XL entry is 38 by 80 inches, so check both rows when reusing an existing frame or fitted sheet. Use the same-scale overlay to inspect the shape, then use the room tool with the actual frame dimensions when available. Add the nightstands and walking space you intend to keep. A familiar size name does not establish product compatibility, and different manufacturer guides may list different nominal widths. The cited profile is kept separate from those alternatives rather than averaged. Doors, drawers and the route used to carry the bed into the room need separate checks.

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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