Whether you want to share a bed with a companion or just have more room to spread out, a king-size bed mattress might be the ideal answer for a good night's sleep. King Size Bed Dimensions in Feet. A king-size bed mattress is 72-78 inches long and 72 inches broad, and a king-size bed is 6' x 6' or 6'x 6'6". King bed frame dimensions. A King-size bed frame measures 78-81″ x 82-85″ and fits a King-size mattress. King bed frames are popular amongst couples who have a bit of room and money to spare. King bed frames are pretty easy to find. Kings beds are best for couples of any weight and size as well as families who like to co-sleep. Since a King Bed Size. The bed size should be the same as the mattress size. In that way, a twin-size mattress will require a bed size with a 38 by 75 inches dimension. The full-size mattress will sit comfortably on a 54 by 75 inches bed and a queen mattress will have a 60 by 80 feet bed. Key Takeaways. Size Differences: A standard king-size bed measures 76 inches in width and 80 inches in length, providing ample space for couples. On the other hand, a California king-size bed, also referred to as a Western king, is slightly different, measuring 72 inches in width and 84 inches in length. A king size mattress is the widest of all standard size mattresses. It is 4 inches wider but 4 inches shorter than a Cal king. A king bed is the perfect size for couples and it has enough room for small children as well. Like Cal king beds, even standard king size mattresses are also available in split options. Due to their size, king-size sheets and other accessories like comforters, duvet covers, and bed frames are more expensive. California King Size Sheets Dimensions. California king beds are similar to king beds in size but have a different shape. California king beds are 4 inches longer than king beds, requiring different bed sheets. A king size bed base and mattress is perfect for people of all sizes along with restless sleepers, hot sleepers, and for those who co-sleep with kids. Dimensions of a king bed. The extra space in a king size bed over other beds comes in the width, not the length. King bed dimensions measure 183cm wide x 203cm deep, providing 30cm more width Cal king size dimensions: 72 x 84 inches (183 x 213.5cm) King size bed dimensions: 60 x 78 inches (153 x 198cm) The UK king size is a good fit for larger bedrooms and provide plenty of space Measured in metric units, a king size bed and mattress is 150cm wide and 200cm long. Converted to imperial units, a king size bed and mattress is 5 feet wide and 6 feet 6 inches long. A standard ‘King Size’ (5’0”) bed includes a longer length than the standard ‘double’ bed and mattress - 6’6” instead of 6’3”. Here are our recommendations for each mattress size: King Size Bed Dimensions (72” width) - Largest size, ideal for couples or families. Queen Bed Measurements (60” width) - Spacious for HwOhfUz.