US King is widest of the three selected conventions; UK King is the narrowest.
The calculated surface-area difference is 30.8%, measured relative to UK King.
| 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 KingAlso: 5ft King | 150 × 200 cm | 150 cm × 200 cm | 59.06 in × 78.74 in | conventionhigh confidence |
| AU King | 1830–1835 mm × 2030 mm | 183.5 cm × 203 cm | 72.24 in × 79.92 in | rangebounded confidence |
King is one of the most misleading international mattress names: US, UK and Australian records have materially different widths.
The figures above are calculated from the identified dimensional records, not from rounded display conversions.
US King is widest of the three selected conventions; UK King is the narrowest.
Rigid frames, enclosed bases, fitted sheets and protectors should be selected from finished product measurements and depth—not from the closest name.
Review US King dimensions and tolerance · Review UK King dimensions and tolerance · Compare another country-qualified pair · Measure before buying
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