Hello friends, Am Joya, Working with Ikea Mattressess- well know for its quality beds. In imperial measure this is about 4ft 7in x 6ft 7in and 5ft 3in x 6ft 7in not standard, but special sizes in the UK market.  We get our odd size mattresses hand made so please accept a tolerance of up to 3cm on the fast delivered size.  These are hand made we could also offer any special mattress to your requirement please call for a quote.