What is the difference between a 180x190 and a 180x200 cm mattress?

A 180x190 cm mattress is 10 cm shorter than the standard kingsize 180x200. The 180x190 is not the most common size, which means it is less widely stocked than the 180x200 and may require confirmation of availability before purchasing. The 10 cm difference is meaningful mainly as a space-saving measure in a smaller bedroom; for most couples of average height, the 180x200 provides more comfortable headroom and is easier to find in frames and bedding.