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Wyoming King mattress dimensions

Wyoming King is an oversized square mattress, 84 by 84 inches in the cited US oversized profile.

Published by BedFit Atlas · Updated 2026-10-17

Dimensions at a glance

US · Nominal bed dimensions
Size	Width (in)	Length (in)	Area (sq ft)
Wyoming KingReviewed 2026-10-17	84	84	49

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1. Wyoming King

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Wyoming King is an oversized square mattress, 84 by 84 inches in the cited US oversized profile. That is 213.4 centimetres on each side, or 7 feet square, and the footprint covers 7,056 square inches, about 49 square feet. It is the smallest of the square oversized sizes listed in the source below.

Wyoming King compared with King

A standard King in the same profile is 76 by 80 inches. Wyoming King adds 8 inches of width and 4 inches of length, which is 976 extra square inches. Two adults sharing a Wyoming King have 42 inches each, compared with 38 inches on a King. The 84-inch length matches a California King's length while being 12 inches wider.

Room space for a Wyoming King

Consider the mattress length aligned to the room length, both sides open, one 20 by 20 inch nightstand, and side and foot clearances each set to 24 inches. A Wyoming King requires 152 inches across and 108 inches along the room. A 12 ft by 12 ft room is 8 inches too narrow across for that layout. A 13 ft by 12 ft room leaves 4 inches across and 36 inches along; a 14 ft by 14 ft room leaves 16 inches across and 60 inches along. These clearances are adjustable preferences for the worked example, not standards. With a mattress this size, door widths, stair turns and the route from the delivery truck to the bedroom need checking before purchase.

Bedding and frames

Oversized mattresses need oversized frames, foundations and bedding, which are usually sold by the same specialist makers rather than in standard ranges. A King fitted sheet is 8 inches too narrow. Confirm the exact dimensions with the manufacturer, since oversized sizes are not standardised across brands.

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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.
Oversized Mattress Sizes — Sleep Foundation Sleep Foundation, Oversized Mattress Sizes; numerical reference values, not product measurements or universal tolerances.
Published room-fit geometry, version 1 — Bed Dimensions