Can You Put A King-Size Mattress On A Double Bed?

Key TakeawaysDetails
Dimensions MatterA king-size mattress is 76″ x 80″, while a double bed measures 54″ x 75″.
Custom CutsNot recommended due to warranty and potential damage.
Alternative SolutionsMattress toppers, high-quality bedding, or bed bridges can make a double bed feel more spacious.

Hey there, dream chasers and midnight wanderers! It’s Lewis, your ultimate sleep guru. Today, we’re diving into a question that’s been boggling the minds of many a sleep aficionado: “Can you put a king-size mattress on a double bed?” Are you riding a mattress wave that’s too big for your bed surfboard? Let’s unravel this cozy conundrum.

The King-Size Reality Check

First things first, let’s tackle the question head-on. No, you cannot put a king-size mattress on a double bed. Why? It’s all about the dimensions, baby. According to Sleep Advisor, a king-size mattress stretches out at 76” x 80”, while a standard double bed measures a more humble 54” wide x 75” long. So, clearly, there’s a sizeable difference here.

Hot Tip: If you’re ever in doubt about which size to pick, our guide on should I get a double or king-size bed is just the ticket.

Did you know? That double beds are know as full beds. Now you Know a little bed jargon.

The Double Bed Debacle

So, why do we even consider trying to make this mattress-bed combination work? Is it the allure of sprawling on a king-size mattress or just the comfort of sticking with a familiar double bed frame? The reasons can be as varied as the patterns on your duvet cover.

Let’s Get Creative

Hey, I get it. Sometimes, you want to feel like a king or queen without giving up your trusty double bed. While you can’t fit a king-size mattress on it, you can get creative. Ever thought of using two double/twin XL beds in a king frame? It’s a neat workaround, and you can learn more about this mattress hack at Do two twins equal a king?

Safety Snooze

Alright, let’s talk safety. It’s not just about the mattress hanging off the edges; it could genuinely be a safety hazard. Imagine waking up halfway off your bed—no thanks! Make sure to secure your mattress well, and for goodness sake, make sure the slats won’t drop out!

Alternatives for the Space Hungry

Feel like you’re running out of room? There are ways to make your double bed feel more spacious. Headboards, bed skirts, and even under-bed storage can create the illusion of a larger sleeping space. And if you’re curious about your options, we’ve got tips for choosing the right size double bed for your bedroom.
If you’re still lost in the mattress maze, you might find some solace in this Quora thread where sleep enthusiasts like you are asking the same question. And for a deep dive into the world of mattress sizes, check out Casper’s mattress size comparison guide.

The Tale Of Two Sizes

King-Size Mattresses: Fit for a King (or Queen!)

Let’s get the royal facts straight. When you hear “king-size,” think grand, spacious, and, well, fit for a king! According to Nectar Sleep, a king-size mattress generously measures 76″ x 80″. That’s a whole lot of space to roll around in! Whether it’s breakfast in bed or an epic pillow fight, these dimensions give you plenty of room to live your best sleep life.

Double Beds: Not Just a Royal Half

Now, let’s talk about the more demure cousin of the king-size—the double bed. Designed to snugly fit two people, a double bed, also known as a full-size bed, is more modest in size. According to Sleep Advisor, the dimensions of a double bed clock in at 54” wide x 75” long.

Quick Comparison:

  • King-Size Mattress: 76″ x 80″
  • Double Bed: 54″ x 75″

Initial Considerations: Measure Twice, Sleep Once

Before you even think about playing matchmaker with your mattress and bed frame, here are some initial considerations:

  • Check the Dimensions: A king-size mattress won’t just magically fit on a double bed frame. Measurements are your best friend here.

  • Space in Room: Will your bedroom turn into a maze with a king-size mattress? Make sure you’ve got enough room to move around.

  • Purpose: Why are you considering this mismatch? Extra space, comfort, or just because you can?

FactorsKing-Size MattressDouble Bed
Dimensions76″ x 80″54″ x 75″
Space NeededSpacious roomModerate room size
Initial ConsiderationsRoom size, purpose, compatibilityPurpose, compatibility

So, my sleep-hungry friends, the dimensions and initial considerations make it clear: a king-size mattress and a double bed are like oil and water—they just don’t mix. But hey, with a little creativity and some good old-fashioned measuring tape, you can find the perfect sleep setup for you.

Practicalities and Alternatives

The Cost of Custom Cuts: Not as Simple as It Seems

Before you whip out that electric saw, let’s talk about custom-cutting a king-size mattress to fit a double bed. According to Hometalk, some adventurous souls have tried this by peeling back the mattress cover and cutting the foam. But hold your horses! This DIY route is not recommended, as it can damage the mattress and void any return policies that may have come with it.

  • Professional Help: If you still want to go down this route, it’s crucial to consult a professional. The cost will depend on whom you hire and the complexity of the job.

  • Warranty Woes: Remember, custom-cutting your mattress will likely void your warranty, so think twice.

Plan B: Making Your Double Bed Feel King-Sized

So, you’re not keen on taking a saw to your mattress but still want that spacious, king-size feel? You’ve got options, snoozers!

  1. Mattress Topper: Adding a plush mattress topper can increase comfort and give the illusion of a bigger bed.

  2. Quality Bedding: Never underestimate the power of high-thread-count sheets and a fluffy comforter. This can make your double bed feel downright luxurious.

  3. Bed Bridge: If you have two twin beds, a bed bridge can combine them into one large sleeping surface.

  4. Upgrade: If space and budget allow, consider upgrading to a larger bed. According to Mattress Advisor, a good quality king-size mattress can range from $800 to $3,000+, while a double bed may cost between $400 to $2,000.

Alternative SolutionsProsConsCost
Mattress TopperIncreased comfortMay not last longVariable
Quality BeddingFeels luxuriousCan be expensive$50-$200+
Bed BridgeExpands sleeping surfaceRequires two beds$20-$100
Upgrade to Larger BedMore spaceTakes up more room$400-$3,000+

Cutting your king-size mattress isn’t advisable due to the potential damage and warranty voiding. But you’re not left without alternative solutions. Whether it’s a mattress topper for extra comfort or an upgrade to a bed that’s fit for royalty, your dreams of a spacious sleep haven can still come true.


Can I put a king mattress on a double bed frame?

No, you can’t. A king-size mattress measures 76″ x 80″, while a double bed frame is designed for mattresses measuring 54” wide x 75” long. Trying to fit the former into the latter is a geometric impossibility. However, you can use two double/twin XL beds in a king frame.

How much bigger is a king size to a double?

Quite a bit, actually! A king-size mattress is 22 inches wider and 5 inches taller than a double bed. That’s a lot of extra space for sprawling, stretching, or storing extra pillows.

How much longer is a king size bed than a double?

Not too much longer, but every inch counts, right? A king-size bed is 5 inches longer than a double bed. It’s a difference that could mean the world to your feet or your pet’s lounging space.

What size mattress fits a double bed?

A double bed is tailored for a full-size mattress, which typically measures 54″ wide by 75″ long. So, if you’re out shopping for a mattress to fit your double bed, look for these dimensions.

Is a double bed twice as big as a single?

Nope, it’s not. While a double bed is more spacious than a single, it’s only 15 inches wider. So, if you’re expecting double the bed space, you’ll need to adjust your expectations.

Final Thoughts: Navigating the Dimensions of Double Beds and King-Size Mattresses

Ah, the dreamy labyrinth of mattress and bed sizes! We’ve unwrapped every layer of this bedtime conundrum for you, from the fundamental differences in dimensions between a king-size mattress and a double bed to exploring alternative solutions for those who crave a spacious sleep haven. We also took a deep dive into the following:

  • Why a king-size mattress won’t fit a double bed frame
  • The cost and implications of custom-cutting a king-size mattress
  • Alternative ways to make your double bed feel more spacious

If you’re still keen on getting that expansive sleep space without upgrading to a king-size bed, don’t fret. There are alternative solutions to make your bedtime just as cozy.

There you have it, dreamers. Whether you decide to stick to your double bed or upgrade to a king, may your nights be filled with sweet dreams and restful slumbers.

– Article by Lewis Hugh

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