Before choosing a mattress, be sure to double-check the full bed dimensions and confirm that they work for both your bed frame and bedroom. What to consider when choosing a full-size mattress .

A US double, also known as a full size mattress, is almost the same size as a UK double. A UK double is 135cm wide and 190cm long (approximately 53 inches wide and 75 inches long).

The bed sizes typically available in the United States range widely and comprise twin, full, queen, king, and California king varieties. So, how do you choose the right size for you?

Double bed vs full size. A full mattress is 54 inches wide and 75 inches long (approximately 137cm wide and 191cm long). It's also often referred to as a double mattress.