Double bed dimensions are 138 centimetres by 188 centimetres, or 46 centimetres wider than a single size mattress. At 188 centimetres, this mattress is the same length as a single size bed and may be too short for some adults. However, the extra width gives solo sleepers room to stretch out. Sharing this mattress size with a partner would be difficult, as each sleeper gets just 69 centimetres of individual space – less than a single size bed.
At 138 centimetres wide, a double size mattress is best for a solo sleeper. Two people may find it comfortable for a short period of time, but it would be cramped and difficult to sleep in certain positions. That’s why this bed size is ideal for older children and guests. Children and teenagers grow quickly, and parents can choose a double bed over a single bed to prevent replacing mattresses. Guests may also be more comfortable on a double mattress, since it gives more room to sit, organise, and move.