Measuring a mattress is easy. The distance from the head to the bottom is known as the length and the dimension across is known as the width. Below are the most common U.S. mattress sizes, with their metric dimensions included.

TWIN SIZE: 39" wide x 75" long (99 cm wide x 191 cm long)

TWIN LONG SIZE: 39" wide x 80" long (99 cm wide x 203 cm long)

FULL SIZE: 54" wide x 75" long (137 cm wide x 191 cm long)

QUEEN SIZE: 60" wide x 80" long (152 cm wide x 203 cm long)

KING SIZE: 78" wide x 80" long (198 cm wide x 203 cm long)

CALIFORNIA/WESTERN KING SIZE: 72" wide x 84" long (183 cm wide x 214 cm long)

NOTE:Two Twin Long beds side by side equals a King Size.

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