What distinguishes it
A UK King is smaller than a US King and close to a North American Queen.
It adds 15 cm width and 10 cm length over a UK Double.
150 × 200 cm
Metric150 cm × 200 cm
Imperial59.06 in × 78.74 in
Surface area3.00 m²
Market aliases: 5ft King.
+15.0 cm width · +10.0 cm length · +17.0% area
The area percentage uses UK Double as its denominator. It adds 15 cm width and 10 cm length over a UK Double. That difference can change whether a rigid frame opening or fitted bedding matches.
Not the same worldwide
A US Queen is 2.4 cm wider and 3.2 cm longer on nominal figures.
Evidence type: convention · high confidence.
Before ordering
A named size is not a fit guarantee. Compare the seller’s finished width, length and stated tolerance with the frame opening and bedding specification.
Published tolerance: Nominal UK convention; verify the finished product.
Measure the finished mattress and the frame’s internal opening. Measure the mattress correctly and check which frame dimension controls fit.
Continue this decision
Curated comparisonUK Double vs King bed size
The extra length is as important as the width when checking a bedstead or fitted sheet.
Curated comparisonUK King vs Super King bed sizeSuper King requires a wider opening and different fitted bedding; its nominal length does not increase.
Curated comparisonUS Queen vs UK King mattress sizeUS Queen is 2.4 cm wider and 3.2 cm longer on nominal figures.
Curated comparisonKing mattress size by countryUS King is widest of the three selected conventions; UK King is the narrowest.
Related UK recordUK DoubleIt is 15 cm wider than a UK Small Double and 15 cm narrower than a UK King.
Related UK recordUK Super KingIt adds 30 cm of width over UK King without increasing nominal length.
Related US recordUS QueenIt is 7 inches wider and 5 inches longer than this dataset’s sourced US Full convention.
Evidence for this answer
- Dreams — The bed and mattress size guideChecked 27 August 2026. Retailer evidence used for dimensions and naming only.
- Which? — UK bed sizes: bed and mattress size guideChecked 27 August 2026. Independent corroboration; no protected prose, tables or imagery reproduced.
Correction route: If a current source or product specification conflicts with this page, send the page URL and evidence through the corrections process.