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Twin vs Twin XL

Twin XL keeps the same width of 38 inches as Twin and adds 5 inches of length in the selected US nominal profile.

Published by BedFit Atlas · Updated 2026-09-20

Dimensions at a glance

US · Nominal bed dimensions
Size	Width (in)	Length (in)	Area (sq ft)
TwinReviewed 2026-09-18	38	75	19.8
Twin XLReviewed 2026-09-18	38	80	21.1

Selected-size differences

Twin XL has the same width as Twin. Twin XL is 5 in longer than Twin. Twin XL has 1.3 sq ft more footprint area than Twin.

Width, length and footprint area are compared for every selected pair. Area is shown in square feet.

AT THE SAME SCALE

See the footprint

1. Twin
2. Twin XL

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About Twin vs Twin XL

Twin XL keeps the same width of 38 inches as Twin and adds 5 inches of length in the selected US nominal profile. BedFit Atlas reviewed the Purple reference values on September 18, 2026: Twin measures 38 by 75 inches and Twin XL measures 38 by 80 inches. The change is at the foot of the mattress when their heads are aligned.

A width check alone cannot distinguish these layouts. In a 12 ft square room, assume both sides are open, one nightstand measures 20 by 20 inches, and side and foot clearances are set to 24 inches. Both sizes require 106 inches across. Along the room, Twin requires 99 inches and Twin XL requires 104 inches. After reserving those footprints and clearances, the remaining length is 45 inches for Twin and 40 for Twin XL.

This is a geometric example. The initial clearances of 24 inches are adjustable preferences, not building or accessibility standards. Door swings, fixed furniture and frame projections are excluded. Measure the outside of the actual frame and check those obstacles separately.

Before buying, compare the product's stated width and length with its frame requirements. Check bedding labels against the actual mattress, including its thickness, rather than relying on the size name alone. Use the room calculator to compare both arrangements with the same measured room and clearance choices.

Check both orientations, nightstands and the walking space you want.

Check Twin in your room Check Twin XL in your room

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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