Standard Mattress Dimensions & Sizing (ISPA)
Direct Answer
Standard mattress dimensions governed by the International Sleep Products Association (ISPA) establish universal width and length measurements across residential bedding. Ranging from Twin (38×75") and Queen (60×80") to Eastern King (76×80") and California King (72×84"), sizes coordinate precisely with bed frames, fitted sheets, and bedroom architectural layouts.
Source: ISPA (International Sleep Products Association) / 16 CFR Part 1633
Specs
| Governing Standards | ISPA / ASTM F2933 / 16 CFR Part 1633 (Federal Flammability) |
| Crib Mattress | 28 × 52 inches (71 × 132 cm) |
| Twin (Single) | 38 × 75 inches (96.5 × 190.5 cm) |
| Twin XL | 38 × 80 inches (96.5 × 203.5 cm) | Standard college dorms |
| Full / Double | 54 × 75 inches (137 × 190.5 cm) |
| Queen (Most Popular) | 60 × 80 inches (152.5 × 203.5 cm) |
| King (Eastern King) | 76 × 80 inches (193 × 203.5 cm) | Equals two Twin XLs |
| California King (Western) | 72 × 84 inches (183 × 213.5 cm) | 4" narrower, 4" longer than King |
Standard King vs California King Geometry
A frequent consumer point of confusion is the dimensional trade-off between standard Eastern King and California King mattresses:
- Eastern King ($76 \times 80\text{ in} / 193 \times 203.5\text{ cm}$): Wider with a surface area of $6,080\text{ sq in}$. It is exactly equal to two Twin XL mattresses placed side-by-side ($2 \times 38\text{" width}$), making it the standard for motorized split-king adjustable bases.
- California King ($72 \times 84\text{ in} / 183 \times 213.5\text{ cm}$): Narrower and longer with $6,048\text{ sq in}$. Specifically engineered for taller individuals ($>6\text{ ft } 2\text{ in}$) to prevent feet from hanging over the end of the bed.
European Bed Sizing Equivalents
European and UK mattress sizes adhere to a standardized $200\text{ cm (78.7 in)}$ length standard:
- EU Single: $90 \times 200\text{ cm}$ ($35.4 \times 78.7\text{ in}$)
- EU Double: $140 \times 200\text{ cm}$ ($55.1 \times 78.7\text{ in}$)
- EU King: $160 \times 200\text{ cm}$ ($63.0 \times 78.7\text{ in}$)
- EU Super King: $180 \times 200\text{ cm}$ ($70.9 \times 78.7\text{ in}$)