The standard length of a single and double bed is 75 inches. A king-size and super king bed typically measures around 78 inches, so if you are particularly tall, this might be a preferable option. In terms of width, a single measures 38 inches, a double measures 53 inches, a king size comes to 59 inches and a super king is 70 inches wide.
‘You each want at least 23 inches on either side of the bed to make it comfortable,’ advises interior designer, stylist, and Ensemblier brand director, Tara Craig, which, for a couple, is accommodated by anything upwards of the standard double bed. Always take measurements of your room to envisage how the space will be taken up by the bed, and factor in floor space, room for bedside tables, and avoid a tight squeeze between the wall.