Naming and aliases
Twin, Full, Queen and King are market labels—not universal measurements.
Full and Double can describe the same US category, while California King and King differ on both axes.
Twin, Full, Queen and King are market labels—not universal measurements.
These are nominal reference dimensions, not a promise that every finished mattress, bed base, fitted sheet or frame opening will match.
Complete US 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 |
|---|---|---|---|---|
| US TwinAlso: Single | 38 × 75 in | 96.5 cm × 190.5 cm | 38 in × 75 in | conventionhigh confidence |
| US Twin XLAlso: Twin Extra Long, XL Twin | 38 × 80 in | 96.5 cm × 203.2 cm | 38 in × 80 in | conventionhigh confidence |
| US FullAlso: Double | 53 × 75 in | 134.6 cm × 190.5 cm | 53 in × 75 in | conventionbounded confidence |
| US Queen | 60 × 80 in | 152.4 cm × 203.2 cm | 60 in × 80 in | conventionhigh confidence |
| US KingAlso: Eastern King | 76 × 80 in | 193 cm × 203.2 cm | 76 in × 80 in | conventionhigh confidence |
| US California KingAlso: Cal King, Western King | 72 × 84 in | 182.9 cm × 213.4 cm | 72 in × 84 in | conventionhigh confidence |
| US Split KingAlso: Two-piece King | 2 × 38 × 80 in | 193 cm × 203.2 cm | 76 in × 80 in | manufacturer examplebounded confidence |
Tolerance and fit
Nominal convention; check the model specification.
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 US comparisons
Complete comparisonUS Twin vs US Twin XLCountry-page comparisonUS California King vs US Split King
Differences: 0.0 cm width, 12.7 cm length and 6.3% area relative to US Twin XL.
Complete comparisonUS King vs US California KingDifferences: 10.2 cm width, 10.2 cm length and 0.5% area relative to US California King.
Differences: 10.2 cm width, 10.2 cm length and 0.5% area relative to US Split 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
- Better Sleep Council — Mattress SizesChecked 27 August 2026. Minimum factual dimensions only; original wording, tables and visuals.
Correction route: If a current source or product specification conflicts with this page, send the page URL and evidence through the corrections process.