In North America, the standard king size bed is 76 inches wide by 80 inches long, making it the same length as a queen size, but significantly wider. Additionally, there are some variants on the king size with different measurements. A split king adds up to the same measurements but takes the form of two twin XL mattresses placed side-by-side. The California king size measures 72 inches wide and 84 inches long, giving tall sleepers more vertical room. An Alaska King measures 108 inches wide by 108 inches tall, and a Wyoming King measures 7 feet square.