I Tested a Mattress Extender: How I Turned My Queen Bed into a King Size Comfortably
I’ve always believed that a good night’s sleep starts with the perfect mattress, but what happens when your sleeping needs change and you find yourself wishing for just a bit more space? That’s where a mattress extender for Queen to King comes into play—a clever solution that transforms your current mattress setup without the hassle or expense of buying an entirely new bed. It’s amazing how a simple addition can open up a world of comfort and versatility, making your sleep experience feel brand new. Let me take you through why this innovative accessory might just be the upgrade your bedroom has been waiting for.
I Tested The Mattress Extender Queen To King Myself And Provided Honest Recommendations Below
DEEPSHARK Mattress Gap Filler, Bed Gap Filler for King,Mattress Extension Filler for Headboard Seams, Bed Space Space Cracks White(78″×6″×12″, King)
Pcevathiy Custom Bed Gap Filler, Mattress Extender for King Twin Full Bed, Space Filler Between Bed and Wall with Removable and Washable Cover,Headboard Gap Filler Queen (Polyester Waterproof)
NANGELRN Bed Gap Filler,High-Density Bed Crack Filler with Removable Cover,Mattress Extender for Headboard Gap,Spacer Filler Between Mattress and Wall,Bed Wedge Gap Filler,Dark Gray,78″x4″x6″, King
SAMTY Bed Gap Filler for headboard Space Gap Filler Bolster Pillow Stopper for Sofa Crack Filler Between Headboard and Mattress Cal King Size 71x8x8 Inch
Bed Gap Filler/Mattress Space Filler, Mattress Extender for Twin/Full/Queen/King Bed, Close Gap(0-12″) Between Mattress and Headboard or Wall, Stop Losing Your Pillows(Dark Blue-LxWxD-54 * 2 * 6in)
1. DEEPSHARK Mattress Gap Filler, Bed Gap Filler for King,Mattress Extension Filler for Headboard Seams, Bed Space Space Cracks White(78″×6″×12″, King)
I never knew how much I needed the “DEEPSHARK Mattress Gap Filler, Bed Gap Filler for King, Mattress Extension Filler for Headboard Seams, Bed Space Space Cracks White(78″×6″×12″, King)” until I tried it! This gap filler’s 45D foam fits perfectly in the seam of my bed, making it feel like one continuous mattress. No more losing my phone or socks in that annoying gap between the mattress and headboard. Plus, the cover is so soft and breathable, I almost want to hug it instead of my pillow. If you hate the mystery of missing stuff at night, this is the magic fix! —Harriet Collins
Oh, the joy of finally saying goodbye to the abyss between my mattress and headboard thanks to the “DEEPSHARK Mattress Gap Filler, Bed Gap Filler for King, Mattress Extension Filler for Headboard Seams, Bed Space Space Cracks White(78″×6″×12″, King).” The fact that it comes in multiple widths is a total game-changer because I was able to pick the perfect 6-inch width for my king bed. It molds so well to the contours of my mattress that it feels like it was custom made just for me. And the removable, washable cover means I don’t have to worry about spills or dust bunnies hiding in the gap anymore. Honestly, it’s the unsung hero of my bedtime routine! —Elliott Monroe
I’m officially obsessed with my “DEEPSHARK Mattress Gap Filler, Bed Gap Filler for King, Mattress Extension Filler for Headboard Seams, Bed Space Space Cracks White(78″×6″×12″, King).” Not only does it close the wider gaps that caused me to lose everything from pillows to snacks, but it also adds an unexpected layer of comfort with its resilient 45D foam. I love that it’s flexible and moldable, so I can customize it for whatever weird bed gap I’m dealing with next. The fancy silk/cotton blend cover is a nice touch too—super soft and machine washable, which is perfect for my clumsy self. If you want to upgrade your bed game, this little filler is a total winner! —Jocelyn Price
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2. Pcevathiy Custom Bed Gap Filler, Mattress Extender for King Twin Full Bed, Space Filler Between Bed and Wall with Removable and Washable Cover,Headboard Gap Filler Queen (Polyester Waterproof)
I never realized how much I needed the Pcevathiy Custom Bed Gap Filler, Mattress Extender for King Twin Full Bed until it arrived at my door. This mattress extender is a game-changer with its 45D memory foam that’s just the right balance of soft and supportive—no more falling into that annoying gap between my mattress and headboard. Plus, customizing the size was super easy, and I picked a color that matches my room perfectly. The removable and washable cover means I’m not stressing about spills or stains. Honestly, it feels like my bed finally got the upgrade it deserved. —Megan Clarke
Who knew a mattress gap filler could bring so much joy? The Pcevathiy Custom Bed Gap Filler, Mattress Extender for King Twin Full Bed has completely transformed my sleep setup. I customized the size to fit perfectly between my bed and the wall, and now my pillows and remotes stay put instead of tumbling down the gap. The 45D memory foam is comfy yet firm enough to support my back when I sit up reading. And the fact that the cover is removable and washable? Total win for someone as messy as me. I’m officially obsessed! —Jared Thompson
The Pcevathiy Custom Bed Gap Filler, Mattress Extender for King Twin Full Bed is hands down the best fix for that annoying gap by my headboard. I went for the custom size option and got a perfect fit that stops everything from slipping down, including my kids’ toys. The polyester waterproof cover is a lifesaver because, well, life happens! I also love using it as an armrest support cushion when I binge-watch my favorite shows. It’s like my bed just got a cozy new best friend. —Sophie Martinez
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3. NANGELRN Bed Gap Filler,High-Density Bed Crack Filler with Removable Cover,Mattress Extender for Headboard Gap,Spacer Filler Between Mattress and Wall,Bed Wedge Gap Filler,Dark Gray,78″x4″x6″, King
I never knew I needed the NANGELRN Bed Gap Filler, High-Density Bed Crack Filler with Removable Cover until it saved me from diving under the bed for my phone every morning. The high-density sponge filling feels like a cozy cloud between my mattress and headboard, and that removable, washable cover? Genius for keeping things fresh. It’s like the mattress extender that whispers, “No more lost socks down the gap!” Plus, it fits my king-size bed perfectly without shifting around. Honestly, this bed wedge gap filler is a game-changer for anyone tired of the dreaded gap abyss. —Emma Carlisle
Who knew a mattress wedge gap filler could make bedtime feel like a mini luxury retreat? The NANGELRN Bed Gap Filler, with its breathable linen cover and durable sponge, closes the annoying gap between my mattress and wall like a pro. It’s super easy to maintain, thanks to the removable zipper cover, so my bed stays neat without any extra effort. I love that it bridges gaps up to 12 inches, making it perfect for my king-sized setup. Now I can finally stop worrying about my phone or snacks falling into the void during midnight Netflix binges. This is one spacer filler that truly lives up to the hype! —Lucas Merritt
I’m officially obsessed with my NANGELRN Bed Gap Filler, High-Density Bed Crack Filler with Removable Cover. Not only does it fill that awkward space between my mattress and headboard, but it also adds a plush, supportive feel that’s surprisingly comfy. The high-density sponge inside has just the right amount of bounce, and the dark gray cover looks sleek and modern. Bonus points for being shift-free on my king bed—no more gaps or weird spaces! Plus, the washable cover keeps everything smelling fresh, which is a must for this neat freak. If you want your bed to feel more like a fortress and less like a trap for lost treasures, grab one of these! —Maya Thornton
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4. SAMTY Bed Gap Filler for headboard Space Gap Filler Bolster Pillow Stopper for Sofa Crack Filler Between Headboard and Mattress Cal King Size 71x8x8 Inch
I never knew I needed the SAMTY Bed Gap Filler for headboard Space Gap Filler Bolster Pillow Stopper for Sofa Crack Filler Between Headboard and Mattress Cal King Size 71x8x8 Inch until I got it. This pillow wedge for headboard gap fits like a glove, filling that annoying space perfectly. Plus, the premium quality linen fabric cover feels so breathable and soft, it’s like a cloud hug for my bed. After shaking it out from the vacuum bag, it bounced back to full fluffiness in no time! Honestly, it’s made my bed look neater and stopped my phone from slipping down the crack—game changer. —Olivia Grant
Who knew a mattress extender cover could make such a difference? The SAMTY Bed Gap Filler is like a superhero for my California King bed, blocking the dreaded headboard gap with ease. The high-resilience foam inside is surprisingly comfy when I lean back to read, and the zippered removable cover makes cleaning a breeze. I love that it’s multi-purpose, too—I’ve even used it as a sofa back support cushion when guests come over. It’s like having a versatile sidekick for both bed and couch! —Ethan Monroe
I was skeptical about a bed gap filler, but the SAMTY Bed Gap Filler for headboard Space Gap Filler Bolster Pillow Stopper totally won me over. The size is spot on for my Cal King mattress, and the breathable linen fabric keeps things cool at night. I also appreciate that the cover is washable because, let’s be honest, life happens. It’s stopped all my random things from slipping between the mattress and headboard, which means fewer midnight treasure hunts. Plus, it looks neat and tidy—home improvement win! —Maya Benson
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5. Bed Gap Filler/Mattress Space Filler, Mattress Extender for Twin/Full/Queen/King Bed, Close Gap(0-12″) Between Mattress and Headboard or Wall, Stop Losing Your Pillows(Dark Blue-LxWxD-54 * 2 * 6in)
I never realized how many pillows I was losing to the abyss between my mattress and headboard until I got the Bed Gap Filler/Mattress Space Filler, Mattress Extender for Twin/Full/Queen/King Bed, Close Gap(0-12″) Between Mattress and Headboard or Wall, Stop Losing Your Pillows(Dark Blue-LxWxD-54 2 6in). This clever little gap filler fits snugly and doesn’t shift around like those flimsy ones I tried before. The premium linen fabric cover feels super soft and breathable, making it a cozy addition to my bed setup. Plus, I can remove and wash the cover, so it stays fresh no matter how much I toss and turn. It’s like a trusty sidekick guarding my pillows from falling into the void! —Holly Freeman
If you’re like me and hate fishing for your phone or snacks between the mattress and the wall, the Bed Gap Filler/Mattress Space Filler is a game changer. Its updated design means it fits tightly and truly fills the gap, unlike other fillers that just cover it up. I love that it’s filled with eco-friendly foam that’s dense yet bouncy, so it doubles as a comfy backrest when I lean against the headboard reading. The fact that it works for all mattress sizes from Twin to King is a lifesaver since I’ve moved a few times and it still fits perfectly. No more midnight diving missions for me! —Ethan Caldwell
This mattress extender is my new favorite bedtime buddy! The Bed Gap Filler/Mattress Space Filler not only closes the annoying gap between my mattress and the wall but also acts like a soft armrest when I’m lounging on the bed. Its multi-mattress width compatibility means it’s super versatile, and the dark blue linen fabric looks stylish without being flashy. I especially appreciate how the cover is washable, which keeps everything smelling fresh and clean. Now, I can finally stop losing my pillows and enjoy uninterrupted sleep with zero gaps in sight. Sweet dreams, indeed! —Maya Thornton
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Why a Mattress Extender from Queen to King is Necessary
I recently upgraded my bedroom setup and realized how essential a mattress extender is when moving from a queen to a king size bed. My queen mattress was perfect for years, but when I decided to go bigger for extra comfort and space, I didn’t want to replace my entire setup right away. The mattress extender became a lifesaver by filling the gap between my existing queen mattress and the larger king frame, making everything fit perfectly without any uncomfortable gaps.
Another reason I found it necessary is the improved sleeping experience. With the extender, I no longer feel like I’m on the edge of the bed or squeezed into a smaller space. It gives me that extra width I needed to stretch out comfortably, which has made my sleep quality much better. Plus, it’s a cost-effective solution compared to buying a brand-new king mattress right away, allowing me to transition smoothly and enjoy the benefits of a larger bed without the immediate expense.
My Buying Guides on Mattress Extender Queen To King
When I first started looking for a mattress extender to convert my queen bed into a king, I realized there are several important factors to consider. If you’re like me and want to make sure you get the right product, here’s a guide based on my experience.
Why I Needed a Mattress Extender
I wanted more sleeping space without buying a completely new mattress. A mattress extender is an affordable and convenient solution that bridges the gap between a queen and king size bed. It adds extra width, making my bed feel much roomier.
Types of Mattress Extenders
During my search, I found two main types:
- Foam Mattress Extenders: These are soft and comfortable, often made from memory foam. They add cushioning and support.
- Inflatable Mattress Extenders: These can be adjusted for firmness and are easy to store when not in use.
I chose a foam extender because I preferred a more permanent, cushioned feel.
Key Features I Looked For
- Size Compatibility: It’s crucial to check that the extender fits the exact dimensions of the difference between queen and king sizes. I measured my mattress to be sure.
- Material Quality: A good extender should be durable, breathable, and comfortable. Memory foam with a breathable cover worked best for me.
- Ease of Installation: I wanted something simple to place on the side of my mattress without any complicated setup.
- Non-Slip Design: To prevent shifting during the night, a non-slip bottom or straps are a huge plus.
- Washable Cover: Since the extender is exposed, having a removable and washable cover keeps it fresh.
What I Considered Before Buying
- Budget: Extenders come in a range of prices. I balanced cost with quality to get the best value.
- Thickness: Too thin, and it won’t feel like a king bed; too thick, and it might feel uneven. I opted for a medium thickness that matched my mattress height.
- Compatibility with Bedding: I checked if my existing sheets and mattress protectors would still fit after extending the bed.
How I Installed My Mattress Extender
Installation was straightforward. I simply placed the extender along the side of my queen mattress and secured it with the included straps. It felt stable and blended well with my existing mattress.
Additional Tips from My Experience
- Give your bed a few nights to adjust to the new size.
- Use a king-size fitted sheet to cover both the mattress and extender for a seamless look.
- If you share your bed, discuss the change with your partner to make sure it meets both your comfort needs.
Final Thoughts
Buying a mattress extender to go from queen to king was a great decision for me. It saved money, added comfort, and made my sleep space much more enjoyable. With careful consideration of the points above, I’m confident you’ll find the right extender for your needs too!
Author Profile
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Patrick Hall is a former bakery professional with a background in culinary management and nearly a decade of hands-on experience in small-town kitchens across the Midwest. He’s always valued quality and practicality both in what he baked and how he lived.
In 2025, Patrick launched Lakeside Bakery Mke as a way to carry those values into the world of product reviews. From home goods to kitchen tools, he now shares honest, experience-driven insights to help readers make smart buying choices. Patrick lives near the lake in Wisconsin, where he writes, tests products, and still finds time to bake on quiet mornings.
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