What size is a king size fitted sheet? Rebecca Leonard March 24, 2019 19:23 Updated Follow Our king size fitted sheets measure 150cm x 200cm. Shop king size fitted sheets. Related articles What size is a double fitted sheet? What materials are used to make our French bed linen and what are their benefits? Are all mattress toppers deep? Will my fitted sheet still fit with my mattress topper? Comments 0 comments Please sign in to leave a comment.