48 inch Size Bed Dimensions are 48 inches wide x 75 inches long. These are fairly standard 48 inch size bed measurements. 48 inch Size Mattress depths can vary from just a few inches to 14" or more. Many times, actual 48 inch mattress dimensions will vary by one or two inches, usually smaller.
Metric to U.S. Conversion
For measuring purposes, the exact conversion is as follows: