The standard American measurements of a queen size bed is 60" in width and 80" in length. This dimension is ideally suited for two average-sized adults.
Measurements may vary by +/- 1/2" based on the brand and manufacturer. They can also vary based on the country or region. For instance, a king-sized bed in the UK has dimensions similar to that of a standard US queen-sized bed, while their next size up is referred to as a super king bed. The depth of a mattress does not follow a specific standard and is dependant on a number of factors, such as latex cushion, support system or pillow top mattress.