King size beds are 150cm x 200cm, which is 5ft across and 6ft6” in length. Offering more length than a standard double bed, king-size beds are perfect for couples who like the freedom to stretch out. The extra space in a king-size bed helps you to get the well-deserved sleep you need. Bear in mind that these beds need more space than a double, especially if you intend to use a headboard, take a look at our in-depth size guide to find the right size bed for you and your bedroom.