Here's some helpful info I found!
Mattress Sizes of the World (in inches)
US/Canada Europe (UK) Asia (Thailand)
Cot 31" × 74" × 2"
Twin / Single 39" × 75" 36" × 75" 42" × 78" × 22"
Twin XL 39" × 80"
Twin XXL 39" × 85"
Super Single (Twin) 48" × 84"
Hospital Twin 30" × 80"
Hospital Twin XL 30" × 85"
Hospital 36" × 75"
Hospital XL 36" × 80"
Hospital XXL 36" × 84"
Three Quarter 48" × 75"
Sofabed Full 54" × 72" × 6"
Full XL 54" × 80"
Full XXL 54" × 85"
Split Queen (2)* 30" × 80"
Queen XL (California Queen) 60" × 84"
Dual King (2)* 36" × 84"
Full / Double 54" × 75" 54" ×75" 48" × 78" × 22"
Queen 60" × 80"
Olympic Queen 66" x 80"
King 76" × 80" 60" × 78" 72" × 78" × 22"
California King 72" x 84"
Super King 72" × 78"