Eachnight may earn commissions for products you purchase through our links. Our articles and reviews include affiliate links and advertisements, including amerisleep advertising. Learn more Updated October 11, 2021The standard king size bed (the largest standard mattress size) is 76 inches wide and 80 inches long. This sounds big already, but the biggest bed sizes are several inches to several feet bigger than the regular king size mattress.To many of us, oversized mattresses seem absolutely unnecessary, but they do have their perks. Most people use oversized mattresses because the beds accommodate co-sleeping families. Others turn to oversized mattresses if they’re uniquely tall.The exact big bed you may want varies on how you plan on using it. For co-sleepers, it depends on how many people are in your family. Tall sleepers should look at how tall they are compared to the bed’s length to help them decide.Below, we take you through the three biggest bed sizes and where you can find them if you’re interested.Biggest Bed Size Dimensions Wyoming KingTexas KingAlaska KingWidth (inches)8480108Length (inches)8498108Width (cm)213.36203.2274.32Length (cm)213.36248.92274.32Minimum Recommended Room Size (feet)12 by 1212 by 1416 by 16Minimum Recommended Room Size (cm)365.76 by 365.76365.76 by 426.72487.68 by 487.68Wyoming KingDimensions: 84 inches wide by 84 inches longIt’s almost funny calling a Wyoming king small, but of the three biggest bed sizes, the Wyoming king is the smallest. It’s 84 inches wide by 84 inches long, making it 4 inches longer and 8 inches wider than king size bed dimensions.You might see some companies calling a mattress of this size an emperor size mattress, but it’s the same as a Wyoming king.Wyoming kings are a good option for plus-sized couples or families who want to co-sleep with one or two children. The Wyoming king bed isn’t unreasonably large, either, so you can use it in most rooms where you would use a standard king bed (roughly a 12 by 12 foot room).Due to their size and the number of materials needed for their construction, Wyoming king mattresses typically cost between $1500 and $3000, making many of them one of the best mattresses under $2000.ProsSuitable for tall single adults and an excellent mattress for couplesFits large sleepers or couplesGood for small co-sleeping familiesConsMore expensive than large standard size mattressesTexas KingDimensions: 80 inches wide by 98 inches longThe Texas king is the second largest oversized mattress, named after the second-largest American state. It’s 80 inches wide and 98 inches long, so while the Texas king is narrower than the Wyoming king, it’s also 14 inches longer.Texas king mattresses are a good option for tall sleepers if a king or California king bed just isn’t cutting it. And when we mean tall, we mean someone who is at least 6.5 to 7 feet tall. Even then, someone who is 6.5 feet tall (78 inches) would still have 20 inches of extra foot room.Texas kings are just a bit more than Wyoming kings, costing between $2000 to $3500 on average. Texas kings fit in narrower bedrooms, but your room should be at least 12 feet wide by 14 feet long to fit this bed.ProsAccommodates very tall single sleepersGood for families who don’t have wide bedroomsConsNarrowest oversized mattressDoesn’t fit more than one or two small children for co-sleepingAlaskan KingDimensions: 108 inches wide by 108 inches longSince Alaska is the largest state in America, it’s only fair to call the largest oversized mattress after it. The Alaskan king is 108 by 108 inches, which is ginormous compared to other large mattresses.The Alaskan king bed is 24 inches longer than the California king, the longest standard mattress, and 32 inches wider than the king, the widest standard mattress. To put this into perspective, that’s several feet of extra space on both ends of the Alaskan king.Alaskan king mattresses are a great option for very tall adults who need to stretch out since there will be no chance of their feet sticking out. Alaskan kings are also an excellent family bed for those who want to co-sleep with more than two children.The Alaskan king even fits up to three or four adults comfortably, if you’re ever in a pinch and need to share a large bed.Since Alaskan kings are so large, they cost between $2500 to $5000 for the mattress alone. Your bedroom should be at least 16 by 16 feet to fit an Alaskan king, though most master bedrooms are smaller than this.ProsPerfect for large, co-sleeping familiesSuits very tall sleepersCouples won’t disturb each other while sleepingConsThe most expensive oversized mattressRequires a huge master bedroomWhere to Get Oversized Mattresses and AccessoriesYour everyday mattress store won’t sell oversized mattresses or their accessories (bed frames, foundations, sheets, or comforters). You can usually find this large of mattresses at specialty retailers or boutiques that make each bed to order. The companies who sell oversized mattresses typically sell the matching accessories as well.With custom-ordering, you can generally decide what the mattress is made from and can choose to add any special materials. You might consider a hybrid, innerspring, or memory foam mattress.Since oversized mattresses are so large and uncommon, the price tags are quite hefty, from between $1500 to over $5000.Before getting any oversized mattress, be sure you have a big enough bedroom to accommodate it. Ideally, there should be at least 2 feet of space between three sides of the bed, excluding the side against the wall, to account for walking space and any other furniture in the room.FAQsWhat are the standard mattress sizes?There are six standard mattress sizes, with the smallest being a twin bed and the largest being a king bed. The standard bed sizes are as follows:Twin: 39 x 75 inchesTwin XL: 39 x 80 inchesFull/Double: 54 x 75 inchesQueen: 60 x 80 inchesKing: 76 x 80 inchesCalifornia King: 72 x 84 inchesSome non-standard sizes you might come across include crib, toddler, small single (cot), full XL, and Olympic queen size mattresses.What’s a double king size bed?A double king size bed is the widest oversized mattress at 152 inches wide and 80 inches long. That’s the equivalent of four twin XL beds pushed together.At 12 feet wide, this bed is absolutely massive and will likely fill the length of most bedrooms, if not more. A double king bed is good for co-sleeping families with three or four children.Is co-sleeping okay?Many families are intrigued by oversized mattresses to co-sleep. Co-sleeping, also called bed-sharing, is when parents sleep in bed with their children or infants.In the past, sharing a large bed with your children was common, but nowadays, most families sleep separately. Still, some families have returned to co-sleeping to better bond with their children. However, co-sleeping does raise your child’s risk of sudden infant death syndrome (SIDS) and should be done with caution.What mattress size is good for couples?We recommend using at least standard queen beds or standard king beds if you share your bed, though a queen size mattress is the smallest comfortable option. If you and your partner are moderately tall (between 6 to 6.5 feet), a California king or Wyoming king offers extra foot room.We recommend Alaskan or Texas kings for plus-sized couples and couples who co-sleep with their children. You may also consider one of these two mattresses if you and your partner have different sleep schedules because there will be minimal motion transfer from one end of the bed to the other.What size bed should a 6-foot tall person get?With the mention of how oversized beds are suitable for incredibly tall individuals, you may wonder what type of bed an average-height adult needs. Those who are roughly 6 feet tall should use a bed 80 inches or longer. Twin XL, queen, king, and California king mattresses are all suitable standard size mattresses 80 inches or longer.Small single bed sizes like twin XL mattresses are suitable for dorm rooms, bunk beds, and small homes, while the larger mattress sizes fit best in master bedrooms or guest rooms.ConclusionFrankly, most people won’t need an oversized mattress, but if you’re in a large co-sleeping family or are very tall, investing in a big bed might be a smart move. The main factor to keep in mind when choosing one of the biggest bed sizes is to have enough space in your bedroom. They’re also quite heavy and difficult to transport, so once it’s in your home, it may be a big task to get it out.About the author Kiera PritchardKiera Pritchard’s curiosity around dreams and dreaming sparked her passion for sleep science. In addition to freelancing for eachnight, Kiera is also a physical trainer and strives to help others lead healthy lives while asleep and awake. Since joining our team, Kiera has compiled multiple sleep health guides offering our readers advice on how to improve their days and evenings. Find more articles by Kiera Comments Cancel replyLeave a CommentYour email address will not be published. Required fields are marked * Comment Name Email I agree to the Terms and Conditions of this website.