Shopping for a new bed and feeling a little lost? You’re not alone. This mattress size comparison lays out every common size in plain English, so you can stop guessing and start sleeping. Here’s the thing: a bed is a big buy, and the size shapes how well you rest for years. So getting it right matters, and it’s easier than you think.

At Compare Deals, we help folks pick the perfect size every single day. Plus, we sell them all for 60 to 70 percent off retail. So once you know which size fits your body and your room, you can grab it without paying mall prices. Let’s walk through the lineup.

The Six Standard Mattress Sizes

Let’s start with the basics. There are six sizes you’ll see in almost any store. Each one has set dimensions, so the numbers don’t change from brand to brand. Here’s the full rundown.

• Twin: 38 by 75 inches
• Twin XL: 38 by 80 inches
• Full (Double): 54 by 75 inches
• Queen: 60 by 80 inches
• King: 76 by 80 inches
• California King: 72 by 84 inches

See the pattern? As you go up, you mostly gain width. The big jump in length happens with Twin XL, King, and Cal King. So if you’re tall, those longer sizes are your friends.

Small Sizes: Twin and Twin XL

Let’s talk small. A twin is the classic kid’s bed at 38 by 75 inches. It’s perfect for children, bunk beds, and tight rooms. So if you’re furnishing a kid’s room or a small guest space, the twin does the job.

A Twin XL adds 5 inches of length, coming in at 38 by 80 inches. That makes it great for tall teens and college dorms. In fact, most dorm beds are Twin XL, not regular twin. Good to know before you buy sheets.

Best for

• Twin: young kids, bunk beds, small guest rooms
• Twin XL: tall teens, dorm rooms, narrow spaces with tall sleepers

Mid Sizes: Full and Queen

Now we hit the sweet spot for many shoppers. A full, sometimes called a double, is 54 by 75 inches. It gives a single sleeper lots of room to roll around. However, it’s a tight squeeze for two adults, so keep that in mind.

The queen is the most popular size in America, and for good reason. At 60 by 80 inches, it fits couples comfortably and still suits solo sleepers who like space. So if you’re not sure where to start, the queen is a safe bet. It’s why our closeout queens, starting at just $399, fly off the floor.

Best for

• Full: solo adults, teens who want more room, smaller guest rooms
• Queen: couples, solo sprawlers, master bedrooms of average size

Quick Re-Hook: The Right Size at the Right Price

Let’s pause for a second. Picking a size is step one. Step two is not overpaying for it. Here’s the good news: at Compare Deals, every size in this mattress size comparison comes in at 60 to 70 percent off retail. So whether you land on a twin for the kids or a Cal King for yourself, you’ll save big. Now let’s finish the lineup.

Big Sizes: King and California King

Time to go large. A standard king is 76 by 80 inches, which is the widest common size. It’s like two twin XL beds pushed together, so couples get tons of personal space. If you both like to sprawl, this is the one.

A California king is 72 by 84 inches. It trades 4 inches of width for 4 inches of length. So it’s the pick for tall sleepers who need leg room over elbow room. Both kings are luxurious, but they suit different bodies and rooms.

Best for

• King: couples who want maximum width, families who co-sleep with kids
• California King: tall sleepers, long and narrow bedrooms

Not sure which big bed wins for you? Our team can pull both out on the floor so you can feel the difference. Come lie down and decide for yourself.

How to Match a Size to Your Room

Here’s a step people skip, and they regret it. Always measure your bedroom before you buy. A bed that’s too big makes a room feel cramped, and walking around it becomes a chore.

A simple guideline is to leave at least 2 feet of open space on each side you use. Here’s a rough room-size guide.

• Twin / Twin XL: 7 by 10 feet works fine
• Full: 10 by 10 feet
• Queen: 10 by 12 feet
• King / Cal King: 12 by 12 feet or larger

If you want help running the numbers, browse our full mattress lineup and tell us your room size. We’ll point you to the size that fits without crowding your space.

How Many People and Pets?

One more thing to weigh: who’s in the bed. A solo sleeper can be happy in a full or queen. Two adults usually want a queen at minimum, and a king if they like room to move.

Got kids who pile in on weekend mornings? A king or Cal King handles the chaos. Add a dog at your feet, and the bigger sizes earn their keep. So count every body, furry ones included, before you pick. For more on how size affects sleep quality, the Sleep Foundation’s size guide is worth a look.

Save Big on Any Size at Compare Deals

Here’s the best part of any mattress size comparison: you don’t have to pay full price for the right size. At Compare Deals, we sell name-brand beds for 60 to 70 percent off retail. These are new mattresses, often closeouts and overstock, priced low because we keep things simple.

Worried about the cost up front? Don’t sweat it. We offer no-credit-needed financing through American First Finance, Acima, Snap, and Koalafi. So you can take home the right size today and pay over time. Check our flexible payment plans to see what fits your budget.

Want to feel each size in person? That’s the smart move. Stop by our Lawrenceville or Morrow stores, lie down on a few, and let our team guide you. If you’re hunting for the lowest prices, our budget mattress deals are a great place to start.

So that’s every size, head to head. Measure your room, count the sleepers, and pick the size that fits your life. Then come see us and save big. We’ll help you walk out with the perfect bed and a price that feels just right.