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The king-size mattress dimensions are 76 inches wide by approximately 80 inches long about 16 inches wider than a queen.

A king sized bed is 76 inches wide, while a queen sized bed is 60 inches wide. In fact, most modern steel bed frames can accommodate both the queen sized and the king sized bed. And the headboard attaches to the bed frame, making the headboard extension much easier. A headboard can be extended to fit a king bed.

a) Double Size 137 cm x 187 cm 4'6" x 6'2" (54"x 74"). b) Queen Size 153 cm x 203 cm 5'0" x 6'8" (60"x 80"). c) King Size 183 cm x 203 cm 6'0" x 6'8" (72" x 80"). d) Super King Size 203cm x 203 cm 6'8" x 6'8" (80" x 80").

A standard twin bed is 39 inches wide and 75 inches long; a standard king bed is 76 inches wide and 80 inches long. Attaching two twin beds will give you a king size bed 2 inches wider than the standard size king and 5 inches short.

An Twin Bed is the smaller cousin of the the Full which is 15 inch wider but has the same length. Sometimes, for simplicity sake, the Twin is called a 'Single' and the Full is called a 'Double'.

A standard king size bed frame measures 76 inches wide by 80 inches long. A California king size mattress measures 72 inches wide and 85 inches long, making it five inches longer but four inches narrower than a standard king size mattress.