Why this pair matters
The UK name sounds larger, but the US King is substantially wider while their nominal lengths are close.
The figures above are calculated from the identified dimensional records, not from rounded display conversions.
US King is 13.0 cm wider than UK Super King. US King is 3.2 cm longer than UK Super King.
The calculated surface-area difference is 9.0%, measured relative to UK Super King.
Width A − B+13.0 cm
Length A − B+3.2 cm
Area A − B+9.0%
Dimensions side by side
| Market + name | Native figure | Centimetres | Inches | Evidence type |
|---|---|---|---|---|
| US KingAlso: Eastern King | 76 × 80 in | 193 cm × 203.2 cm | 76 in × 80 in | conventionhigh confidence |
| UK Super KingAlso: 6ft Super King | 180 × 200 cm | 180 cm × 200 cm | 70.87 in × 78.74 in | conventionhigh confidence |
Compatibility decision
US King is about 13 cm wider and 3.2 cm longer.
Rigid frames, enclosed bases, fitted sheets and protectors should be selected from finished product measurements and depth—not from the closest name.
Check the underlying records
Review US King dimensions and tolerance · Review UK Super King dimensions and tolerance · Compare another country-qualified pair · Measure before buying
Evidence for this answer
- Better Sleep Council — Mattress SizesChecked 27 August 2026. Minimum factual dimensions only; original wording, tables and visuals.
- 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.