Updated April 9, 2020 Along with your bed’s firmness, support, and conforming qualities, the right size mattress can significantly improve your sleep. Many people choose a smaller mattress than what they need and end up feeling too uncomfortable to sleep. With so many bed sizes available, how do you know which fits your sleep style best? This article discusses different mattress sizes (standard and non-standard) and the recommended room sizes for each bed size. We will also explore how to choose the right mattress size. Mattress Size and Dimensions Guide MattressDimensions (Inches)Dimensions (CM) Crib27.25 inches by 51 inches69.2 cm by 129.5 cm Small Single30 inches by 75 inches76.2 cm by 190.5 cm Twin38 inches by 75 inches96.5 cm by 190.5 cm Twin XL38 inches by 80 inches96.5 cm by 203.5 cm Full54 inches by 75 inches134.5 cm by 190.5 cm Full XL54 inches by 80 inches137 cm by 203.5 cm Queen60 inches by 80 inches152.5 cm by 203.5 cm Olympic Queen66 inches by 80 inches167.5 cm by 203.5 cm King76 inches by 80 inches193 cm by 203.5 cm California King72 inches by 84 inches 183 cm by 213.5 cm Crib Mattress Dimensions: 28 inches by 52 inches Room size requirements: 7 feet by 10 feet The crib mattress only fits inside a crib and is regulated by the federal government for safety reasons. This size mattress is usually firm and no thicker than 6 inches. To sleep comfortably on a crib mattress, a child must be shorter than 3 feet. If the child is taller than 3 feet, consider buying a small single mattress. Small Single Mattress: 30 inches by 75 inches Room size requirements: 7 feet by 10 feet The small single mattress is excellent for toddler beds. The small single mattress is a standard mattress size, so most toddler bed frames will support it. Twin Mattress Dimensions: 38 inches by 75 inches Room size requirements: 7 feet by 10 feet The twin-size mattress is 38 inches by 75 inches—8 inches wider than a crib bed. The twin bed accommodates children and smaller teens but isn’t long enough for a full-grown adult. An adult’s feet will hang over the edge, making it harder to get a good night’s sleep. Twin mattresses are compatible with bunk beds and conserve space for those living in a small apartment or sharing a room. Twin mattresses are easy to move because they are lightweight and small enough to maneuver in narrow hallways. Twin XL Mattress Dimensions: 38 inches by 80 inches Room size requirements: 9.6 feet by 10.6 feet The twin XL size mattress is 5 inches longer than the twin bed, making it best for taller people. The twin XL mattress is a popular mattress size for college dorm rooms and pairs well with bunk beds. Twin XL mattresses aren’t as expensive as full or queen size beds, so keeping one handy for a guest is an affordable alternative. Full Mattress Dimensions: 54 inches by 75 inches Room size requirements: 9.6 feet by 10.6 feet A full size mattress, or double bed, doesn’t provide enough space for a couple but is a notable upgrade for a single sleeper. A double bed offers enough space to spread out but doesn’t take up much floor space, making it a good option for teenagers or young adults. Double mattresses aren’t as expensive as queen mattresses, but they are a bit harder to move because they aren’t as compact and lightweight as a twin XL. Full XL Mattress Dimensions: 54 inches by 80 inches Room size requirements: 9.6 feet by 10.6 feet A full XL mattress has an extra 5 inches of legroom, accommodating the height of a full-grown adult. We don’t suggest this size for couples because the width is too narrow; however, this bed makes an excellent guest room bed—especially if you don’t have the budget for a queen. Queen Mattress Dimensions: 60 inches by 80 inches Room size requirements: 10 feet by 10 feet Queen mattresses offer enough room for couples to sleep comfortably. We suggest this mattress size to couples who don’t need much space or a single adult who needs extra room. The queen size bed is an excellent option for a guest or master bedroom. Many people get queen mattresses for their older teenagers and turn it into a guest bed when the child moves out. Queen size beds come as split queens (two separate mattresses). These work well for couples with different firmness preferences. Olympic Queen Mattress Dimensions: 66 inches by 80 inches Room size requirements: 10 feet by 10 feet The Olympic queen offers 6 additional inches of width for couples who don’t need a king-size bed but want extra room. This mattress isn’t a standard size bed, so it isn’t as accessible in mattress stores. Olympic queen size bedding is also challenging to find. You can use Olympic queen mattresses in RVs, campers, and mobile homes. King Mattress Dimensions: 76 inches by 80 inches Room size requirements: 12 feet by 12 feet King mattresses measure 16 inches wider than queen beds, and they’re long enough for most adult sleepers. The king-size bed is the widest mattress of the standard bed sizes, so it provides enough room for two people to have their own space. King mattresses are available as a split option, which is two twin XL beds side-by-side. This option allows couples to have different mattress preferences instead of compromising on a single bed. Many people choose the split king mattress size because it works well with adjustable beds. California King Mattress Dimensions: 72 inches by 84 inches Room size requirements: 12 feet by 12 feet California king mattresses are 4 inches narrower and 4 inches longer than a king mattress. The extra length can accommodate extra tall people. This mattress can comfortably fit two adult sleepers and parents who co-sleep with a child. The California king bed comes in a split option, so each sleeper can select a different mattress firmness from their partner. How to Choose the Best Mattress Size You want a bed big enough to encourage restful sleep, so you will need to consider who sleeps in the bed, how much space they need, and your bedroom’s size. Who Sleeps In the Bed? If you’re buying for yourself, you most likely know what mattress size suits you best; however, if you have a sleeping partner or children you co-sleep with, you have to think about their sleep preferences as well. For adults and couples, the queen mattress is probably the smallest size you’d want to sleep on. Full XL beds don’t offer enough room for a couple to sleep comfortably. If you and your partner need extra sprawling room, a king bed provides more space. A single sleeper who needs extra spreading room would fit comfortably on a full XL—otherwise, a single sleeper will probably sleep well on a twin XL. Refer to our guide below to find the best mattress size for your circumstances. Toddlers, children, or young teenagers are comfortable on these mattress sizes: Small Single Twin Twin XL Full Single adults, college student, or older teenagers are comfortable on these mattress sizes: Twin XL Full XL Queen Two adult sleepers are comfortable on these mattress sizes: Queen King California King Two adult sleepers who co-sleep with children are comfortable on these mattress sizes: King California king Your Body Type Your height may affect the bed size you need to sleep comfortably. For people 5 feet 5 inches or taller, we suggest a mattress at least 80 inches long to prevent the feet from dangling over the bed’s edge and disrupting sleep. Room Size Before you buy a bed, consider the bedroom the mattress will occupy. A larger mattress needs more space than a small bed. You need to leave enough room for movement between the mattress, the walls, and any furniture. Overcrowding the bedroom can make your sleep environment stressful, which can make it hard to fall asleep. So, make sure to measure your room before deciding on a mattress size. Room size requirements for mattress sizes: Mattress SizeRoom Size (Inches)Room Size (CM) Crib7 feet by 10 feet213.36 cm by 304.8 cm Small Single7 feet by 10 feet213.36 cm by 304.8 cm Twin 7 feet by 10 feet213.36 cm by 304.8 cm Twin XL9.6 feet by 10.6 feet292.60 cm by 323.08 cm Full9.6 feet by 10.6 feet292.60 cm by 323.08 cm Full XL9.6 feet by 10.6 feet292.60 cm by 323.08 cm Queen10 feet by 10 feet304.8 cm by 304.8 cm Olympic Queen10 feet by 10 feet304.8 cm by 304.8 cm King12 feet by 12 feet365.76 cm by 365.76 cm California King12 feet by 12 feet 365.76 cm by 365.76 cm Your Sleep Position Your preferred sleep position can give you an idea of how large a sleep surface you need. If you toss and turn a lot or sleep spread-eagle, you’ll need more room than someone who uses a small portion of the bed. Those who need more legroom and restless sleepers should choose a larger mattress; on the other hand, couples who like to snuggle or those who don’t take much space can sleep comfortably on a smaller bed. Consider Your Home Mattresses are heavy and can get damaged when you’re moving them from place to place. If you plan on buying a large bed, such as a king or California king, you might want to wait until you’re settled in your forever home—or a place you are going to live in for at least 10 years. Consider how you’re going to move your mattress. If you’re purchasing a larger mattress, your home might not accommodate it. Measure doorways and halls so ensure you’ll have enough room to maneuver it. You might consider getting a bed-in-a-box mattress, which is shipped to your doorstep in a small box—this way, you can easily move the mattress to your bedroom. Budget Larger mattresses contain more materials and, therefore, cost more. If you want a bigger bed, you will need a larger budget. Twin mattresses commonly cost between $300 and $600, and a quality queen size mattress can cost between $700 and $2000. You’ll have to consider the quality of the mattress you want to buy, too. Purchasing a low-quality mattress might save your wallet initially, but you’ll have to replace it more frequently than higher-quality beds, costing you more money in the long run. FAQ Are there mattresses larger than the California king? There are oversized beds such as the Alaskan king, the Texas king, and Wyoming king. Some companies take custom orders so you can get the exact size mattress you want. What is the best size bed for a couple? The best mattress for a couple depends on the couple. Sleeping partners who like to cuddle will enjoy a queen mattress far more than a king. On the other hand, a couple who needs more spreading room will receive better sleep on a king mattress than a queen size. What mattresses work with an adjustable base? A split king or twin XL bed is compatible with an adjustable base. Adjustable bed frames are also made for full and queen-size beds. Conclusion No matter how much room you or your sleep partner needs, there is a mattress large enough to help you sleep comfortably. If you choose a mattress size too small for you or your sleep partner’s sleep style and height, your sleep quality could suffer. This article is for informational purposes and should not replace advice from your doctor or other medical professional. Comments Cancel replyLeave a Comment Your email address will not be published. Required fields are marked * Comment Name Email I agree to the Terms and Conditions of this website.