Let our mattress size guide help you make an informed decision when choosing the size of your next mattress. Buying a too-small mattress is one of the biggest mistakes new bed-buyers make. Couples who’ve been sleeping on a double, also known as a full size mattress, since they got married may think they have enough room, until they learn that each person has only as much sleeping space as a baby’s crib!. King Mattress. The king size mattress dimensions are 76 inches wide by approximately 80 inches long about 18 inches wider than a queen. Use our handy bed and mattress size guide to find the dimensions of all common bed sizes, specified in Feet & Inches, Inches and Centimetres. King size Offers plenty of space for each person. Shop the King Size Casper Mattress, designed with just the right bounce and sink for outrageously comfortable sleep. Perfect for couples, parents who share the bed with small children, and individuals who require extra space, the Casper King Mattress is 76 wide and 80 long.
Mattress Sizes Size Guide From The Better Sleep Council