While twin is considered the standard name in the us for a mattress that measures 39 inches by 75 inches other parts of the world favor the term single for a bed with the same dimensions. So it is time for a new mattress and perhaps also time for you to rethink the mattress. Bed Measurments Quilt Sizes Bed Mattress Sizes Mattress Size Chart The following chart gives the most common mattress size dimensions in united states europe and asia region. Bed sizes comparison . Compare beds and their features side by side with sleep advisor s mattress comparison chart tool that will help you get a clear picture about price firmness warranty trial and many other things you might need. Use this mattress dimension guide to find your perfect fit. There is only 6 of width difference between double and queen size beds but the 6 make a big difference. Twin mattress dimensions 38 x 75 inches twin xl mattress dimensions 38 x 80 inches full mattress dimensions 54 x. Shopping for fitted sheet