What distinguishes it
The widest UK convention included in V1.
It adds 30 cm of width over UK King without increasing nominal length.
180 × 200 cm
Metric180 cm × 200 cm
Imperial70.87 in × 78.74 in
Surface area3.60 m²
Market aliases: 6ft Super King.
+30.0 cm width · 0.0 cm length · +20.0% area
The area percentage uses UK King as its denominator. It adds 30 cm of width over UK King without increasing nominal length. That difference can change whether a rigid frame opening or fitted bedding matches.
Not the same worldwide
It is narrower than a US King and close to an Australian King example.
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 King vs Super King bed size
Super King requires a wider opening and different fitted bedding; its nominal length does not increase.
Curated comparisonUS King vs UK Super King sizeUS King is about 13 cm wider and 3.2 cm longer.
Related UK recordUK KingIt adds 15 cm width and 10 cm length over a UK Double.
Related US recordUS KingIt is 4 inches wider and 4 inches shorter than a California King.
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.