What Size Is a King Bed Mattress?

A UK king size mattress measures 150cm by 200cm, but depth is the variable most buyers overlook and it ranges from around 18cm to 32cm depending on construction. This guide explains what those figures mean for headboard proportions, bedside cabinet height and which fitted sheets will actually stay on. We compare open coil, pocket sprung, memory foam and hybrid constructions at king size, explain why motion transfer and independent spring response matter when two sleepers are 150cm apart, and set out the central support and slat spacing a 150cm base must provide. There is also guidance on dual tension and zip and link options for couples with different firmness preferences, plus straightforward advice on rotation, airing and protection....