What width is a single mattress? Roz asked 25th September 2017 What width is a single…..2.6 or 3 foot please 1 answer 0 Vote Up Vote Down Lee Staff answered 1 year ago Hi Roz, Thanks for getting in touch. A standard UK single is 3 foot x 6ft 3in long or 90cm wide x 190cm long. You can find all of our mattress sizes here with all the dimensions and weights of our models. If you need any more help please get in touch with our friendly team on 0161 437 4419 or [email protected]. Kind regards Julie Why not have a look at our best sellers next? From £505.00 Origins Pocket 1500 From £945.00 Fusion 3 From £755.00 Artisan Naturals Home Questions What width is a single mattress?