Twin Size Bed Dimensions are 39 inches wide x 75 inches long. These are standard twin bed measurements. Twin Mattress depths can vary from just a few inches to 16" or more for the new huge pillow tops. Many times, actual twin 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:

• One inch is equal to exactly 2.54 centimeters.
• One foot is equal to 30.48 centimeters.
• One meter is equal to 39.37 inches.