King Size Bed Dimensions are 76 inches wide x 80 inches long. These are standard King bed measurements. King Mattress depths can vary from just a few inches to 16" or more for the new huge pillow tops. Many times, actual king mattress dimensions will vary by one or two inches, usually smaller. These are North American Bed Sizes.
Metric to U.S. Conversion
For measuring purposes, the exact conversion is as follows: