A standard king size mattress measures 76 inches wide by 80 inches long (approximately 6.33 feet by 6.67 feet or 193 cm by 203 cm). This size provides ample space for two adults to sleep comfortably, or for couples who share their bed with children or pets

. It is the widest standard mattress size available and offers more sleeping space than queen or full sizes. When choosing a king mattress, ensure your bedroom has enough space to accommodate it comfortably, ideally with at least 2 feet of free space around the mattress for ease of movement and bed-making