A queen size mattress is 60 inches wide by 80 inches long, whereas a king size mattress is 76 inches wide by 80 inches long. A king bed is generally more expensive than a queen.
A king size mattress is also known as an Eastern king, and is recommended for couples who desire the maximum amount of personal space while sleeping. It is also a good choice for people who have kids or pets that sleep on the bed with them.
A queen size mattress is the most popular mattress on the market today, accounting for approximately 32 percent of all mattresses purchased, according to Diffen as of 2015.