A 54″ × 72″ mattress / bed is  137cm × 183 cm in centimeters. In Australia: it’s almost as big as Double or Full (54 in × 74 in) In USA: it’s almost as big as Double or Full (54 in × 75 in) In UK: it’s almost as big as Double or Full (53
A 78″ X 80″ mattress / bed is  193 × 203 cm in centimeters. In Australia: it’s bigger than California king (72 in × 84 in), but smaller than Grand king (80 in × 80 in). In USA: it’s bigger than California king (72 in × 84 in), but smaller than Grand king (80 in
A 72″ X 80″ mattress / bed is  183 cm × 203 cm in centimeters. In Australia: it’s King. In USA: it’s bigger than Queen (60 in × 80 in), but smaller than King (76 in × 80 in). In UK: it’s bigger than Grand king/ Super king (71 in × 79 in). Related Posts
A 60″ X 78″ mattress / bed is  152 cm × 198 cm in centimeters. In Australia: it’s bigger than Double or Full (54 in × 74 in), but smaller than Queen (60 in × 80 in). In USA: it’s bigger than Double extra long (54 in × 80 in), but smaller than Queen (60
A 72″ X 78″ mattress / bed is  183 cm × 198 cm in centimeters. In Australia: it’s bigger than  Queen (60 in × 80 in), but smaller than King (72 in × 80 in). In USA: it’s bigger than Queen (60 in × 80 in), but smaller than King (76 in × 80 in).
A 72″ X 84″ mattress / bed is  183 cm × 213 cm in centimeters. In Australia: it’s California king. In USA: it’s California king. In UK: it’s bigger than Grand king/ Super king (71 in × 79 in). Related Posts What are the dimensions of a king size housewife pillowcase What are the dimensions