Naming and aliases
Small Single, Small Double and Super King are specifically scoped UK names in this guide.
“Queen” can mean Small Double in UK retail; it must never be assumed to mean a North American Queen.
Small Single, Small Double and Super King are specifically scoped UK names in this guide.
These are nominal reference dimensions, not a promise that every finished mattress, bed base, fitted sheet or frame opening will match.
Complete UK reference table
Native units are retained. BedMetric derives the second unit system from the same millimetre value so the two displays cannot drift apart.
| Market + name | Native figure | Centimetres | Inches | Evidence type |
|---|---|---|---|---|
| UK Small SingleAlso: Narrow Single, 2ft 6in | 75 × 190 cm | 75 cm × 190 cm | 29.53 in × 74.8 in | conventionhigh confidence |
| UK SingleAlso: 3ft Single | 90 × 190 cm | 90 cm × 190 cm | 35.43 in × 74.8 in | conventionhigh confidence |
| UK Small DoubleAlso: Queen, Three-quarter, 4ft | 120 × 190 cm | 120 cm × 190 cm | 47.24 in × 74.8 in | conventionhigh confidence |
| UK DoubleAlso: 4ft 6in | 135 × 190 cm | 135 cm × 190 cm | 53.15 in × 74.8 in | conventionhigh confidence |
| UK KingAlso: 5ft King | 150 × 200 cm | 150 cm × 200 cm | 59.06 in × 78.74 in | conventionhigh confidence |
| UK Super KingAlso: 6ft Super King | 180 × 200 cm | 180 cm × 200 cm | 70.87 in × 78.74 in | conventionhigh confidence |
Tolerance and fit
Nominal UK convention; verify the finished product.
Measure the finished product and the frame’s internal opening. Do not infer compatibility from a market name or a rounded conversion.
How to measure correctly →Three useful UK comparisons
Differences: 15.0 cm width, 0.0 cm length and 16.7% area relative to UK Single.
Differences: 15.0 cm width, 10.0 cm length and 14.5% area relative to UK King.
Complete comparisonUK King vs UK Super KingDifferences: 30.0 cm width, 0.0 cm length and 16.7% area relative to UK Super King.
Cross-country warning
A matching name in another country is not proof of the same dimensions. Use mattress sizes by country or compare two qualified records before buying.
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.