The king size mattress (https://www.freshupmattresses.com/mattress/spring-mattress.html) measures 78 x 72 inch. This mattress is huge in size and gives an individual a space of 36 inch each. It can easily accommodate couples with their toddlers and pets.
Single bed measures (https://www.freshupmattresses.com/) 72inch x 36inch. It can accommodate a single person. Sometimes people prefer buying two single bed mattresses instead of one queen size mattress as it is relatively lighter and easy to life.
This guide will be useful when you are on a mattress hunt the next time.