Mattress size comparisons

Two mattresses get a comparison here when someone might genuinely be choosing between them: they are sold in the same country, or they share a name across countries and are not the same size. That second case is the expensive one — a UK King and a US King are 43 cm apart and nothing in the name says so.

Each page gives the difference on both edges, the width each sleeper gets, the room the bed needs, and whether bedding bought for one will fit the other.