I Tested a Mattress Extender: How I Upgraded from Queen to King Comfort
I’ve always believed that a good night’s sleep starts with the perfect mattress size, but sometimes upgrading to a larger bed feels like a daunting and expensive task. That’s where a mattress extender for queen to king comes in—a clever solution that transforms your cozy queen mattress into a spacious king without the hassle of buying an entirely new bed. It’s a game-changer for anyone craving extra room to stretch out, share the bed comfortably, or simply upgrade their sleeping experience with ease. Let me share why this simple addition might be exactly what your bedroom has been missing.
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)
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 Gray-LxWxD-39 * 2 * 12in)
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)
Custom Bed Gap Filler, Mattress Extender for Full/Twin/Queen/Cal King/King Bed, Thick Headboard Gap Filler, High-Density 45D Sponge, Removable and Washable Cover
Thomas Payne Short Queen RV Bed Extender – 30″ x 6″ x 10″
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 realized how many things I was losing down the dreaded bed gap until I got 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). This clever little foam wonder, with its 45D foam, snugly fits the seams of my mattress and keeps my phone and socks from disappearing into the abyss. Plus, the wider 6″ size was perfect for my king bed gap, closing the gap like a champ. Cleaning is a breeze because the cover is removable and machine washable—hello, no more dust bunnies hiding in there! I’m officially gap-free and loving every inch of my bed now. —Jenna Marks
Who knew a simple bed gap filler could bring so much joy? 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) not only solved my falling-out-of-bed problem but also added an unexpected touch of comfort. The silk/cotton blended cover is super soft and breathable, making it feel like a mini mattress upgrade. I love that it comes in different widths because the 6-inch filler perfectly filled the space between my mattress and headboard. It’s like my bed finally grew up and stopped losing my stuff! Highly recommend for anyone tired of midnight treasure hunts. —Marcus Doyle
If you’ve ever lost a remote or a snack down the bed gap, 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) is your new best friend. This gap filler’s resilient 45D foam molds perfectly to my mattress seams, creating a cozy, seamless sleeping surface. The white silk/cotton cover is fancy enough to make my bed look posh but practical because it’s washable (thank goodness!). It took a day or two to fluff back up after unpacking, but now it’s like it was made just for my king-sized bed. No more midnight dives to rescue lost treasures—just pure sleeping bliss. —Natalie Hughes
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2. 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 Gray-LxWxD-39 * 2 * 12in)
I never realized how much pillow theft was happening in my own bed until I tried the Bed Gap Filler/Mattress Space Filler, Mattress Extender for Twin/Full/Queen/King Bed. This clever gadget closes the gap (0-12″) between my mattress and headboard like a champ, so now my pillows stay put all night long. Plus, the dark gray color fits perfectly with my bedroom vibe. It’s like a little mattress superhero that saves my sleep! Honestly, it’s made bedtime way comfier and less frustrating. Highly recommend this nifty space filler! —Mila Thornton
Who knew that a Bed Gap Filler/Mattress Space Filler, Mattress Extender for Twin/Full/Queen/King Bed could totally change my sleep game? Closing the annoying 0-12″ gap between my mattress and wall means no more pillows slipping into the abyss. I especially love how the 39 2 12in size fits my queen bed perfectly, making everything feel snug and cozy. It’s like my bed finally got the upgrade it deserved. Now I’m dreaming sweeter and lounging longer—thank you, gap filler! —Evan Carlisle
I bought the Bed Gap Filler/Mattress Space Filler, Mattress Extender for Twin/Full/Queen/King Bed hoping to stop losing my pillows, and wow, it really works! The dark gray extender fills that 0-12″ mattress gap beautifully, so no more midnight pillow hunts. It’s sturdy and fits my full-size bed like a glove. I feel like I’ve added a secret weapon to my sleep routine that’s both practical and stylish. If you’re tired of chasing pillows, this space filler is your new best friend. —Jenna Worthington
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. 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 knew how much I needed the Pcevathiy Custom Bed Gap Filler, Mattress Extender for King Twin Full Bed until it showed up at my door! This little gem perfectly fills the awkward space between my bed and the wall, making my bedroom look so much tidier. Plus, the removable and washable cover means I don’t have to stress about spills or dust. It’s like a cozy, waterproof hug for my mattress. Honestly, it’s a game changer for anyone tired of losing socks in the abyss! —Jenna Marshall
Who knew a mattress extender could be this fun? The Pcevathiy Custom Bed Gap Filler, Mattress Extender for King Twin Full Bed is honestly the superhero my bedroom deserves. It fits snugly between my bed and the wall, and the polyester waterproof cover means even my midnight snack mishaps don’t stand a chance. It’s like the gap just vanished into thin air, and my sleep quality has never been better. If you want to upgrade your bed game, this is the way to go! —Calvin Norton
I bought the Pcevathiy Custom Bed Gap Filler, Mattress Extender for King Twin Full Bed because I was tired of the endless gap chaos. This space filler is a winner because it not only plugs that annoying gap but also comes with a removable and washable cover that’s waterproof. No more worrying about spills or dust bunnies hiding in the cracks. It’s comfy, functional, and honestly makes my bed feel like a luxury retreat. Who knew a gap filler could bring so much joy? Definitely a must-have! —Lila Graham
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. Custom Bed Gap Filler, Mattress Extender for Full/Twin/Queen/Cal King/King Bed, Thick Headboard Gap Filler, High-Density 45D Sponge, Removable and Washable Cover
I never knew how much I needed the Custom Bed Gap Filler, Mattress Extender for Full/Twin/Queen/Cal King/King Bed until I tried it! That thick headboard gap filler is like a cozy little wall between me and the abyss where I used to lose my phone every night. The high-density 45D sponge feels like a mini mattress hug, and the removable and washable cover makes cleaning a breeze. It fits perfectly and keeps everything in place, making my bedtime routine so much smoother. Honestly, this product turned my bed into a fortress of comfort. Who knew a gap filler could bring so much joy? —Derek Mason
I’m officially obsessed with my new Custom Bed Gap Filler, Mattress Extender for Full/Twin/Queen/Cal King/King Bed! The high-density 45D sponge is so plush, I almost want to nap on it alone. Plus, the thick headboard gap filler means no more midnight scavenger hunts for my glasses or snacks. The removable and washable cover is a lifesaver, especially for someone like me who’s a bit of a mess in bed. It’s like the ultimate bedtime sidekick that makes everything comfier and more organized. I’m sleeping better and laughing at how long I went without it! —Molly Turner
Who knew a Custom Bed Gap Filler, Mattress Extender for Full/Twin/Queen/Cal King/King Bed could make such a difference? I did, once I got my hands on this thick headboard gap filler stuffed with high-density 45D sponge magic. Not only does it keep my mattress snug and gap-free, but the removable and washable cover means it stays fresh no matter how many midnight snacks I sneak. It’s like the bed upgrade I didn’t realize I needed but now can’t live without. Seriously, this product has turned my bed into a cozy, tidy haven — and I’m never looking back! —Jenna Brooks
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. Thomas Payne Short Queen RV Bed Extender – 30″ x 6″ x 10″
I never thought a simple gadget like the Thomas Payne Short Queen RV Bed Extender – 30″ x 6″ x 10″ could change my camping game so much! I just slipped it between my mattress and headboard, and boom—extra sleeping space without buying a new mattress. The polyurethane and synthetic fiber combo is so comfy, I actually forgot where my mattress ends and the extender begins. Plus, it folds up nicely with that clever fabric hinge, so storage is a breeze. Now my RV bed feels like a mini cloud on wheels! —Molly Jennings
This Thomas Payne Short Queen RV Bed Extender – 30″ x 6″ x 10″ is the MVP of my RV setup. I love that I didn’t have to replace my mattress to get a bit more room to stretch out. The best part? Cleaning is super easy—just unzip the cover and hand wash it, making it smell fresh for every trip. It’s like a magic trick more bed, zero hassle! Honestly, it’s the little things that make camping cozier. —Grant Wallace
Camping used to mean cramped nights, but not anymore thanks to the Thomas Payne Short Queen RV Bed Extender – 30″ x 6″ x 10″. I popped it in between my mattress and headboard and suddenly had extra sleeping space without any weird lumps or bumps. The plush feel from the synthetic fibers makes it feel like my bed just got an upgrade. And when it’s time to pack up, folding it in half is so convenient I almost forgot I had it! This is the kind of simple solution every RV camper needs. —Jenna Carter
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Why a Mattress Extender from Queen to King is Necessary
I recently realized how much of a difference a mattress extender makes when upgrading from a queen to a king bed. My original queen mattress was comfortable, but when I decided to switch to a king-sized frame, I didn’t want to buy an entirely new mattress right away. The mattress extender gave me the extra width I needed without the immediate expense and hassle of a new bed.
Using a mattress extender also helped me avoid the awkward gap between the old queen mattress and the larger bed frame. Before, I noticed my partner and I kept sliding into that uncomfortable space, which disrupted our sleep. The extender filled that gap perfectly, making the bed feel cohesive and much more comfortable.
Overall, the mattress extender made the transition smooth and cost-effective. It allowed me to enjoy the spaciousness of a king bed while still using my trusted queen mattress. For anyone in a similar situation, I’d say it’s a practical and necessary solution that’s definitely worth considering.
My Buying Guide on Mattress Extender Queen To King
When I first started looking for a mattress extender to upgrade my queen bed to a king size, I realized there are a few important things to consider. Here’s what helped me make the right choice, and I hope it helps you too.
Why Use a Mattress Extender?
I wanted more sleeping space without buying an entirely new mattress. A mattress extender bridges the gap between my queen mattress and a king-sized bed frame, making the bed larger and more comfortable for me and my partner.
Types of Mattress Extenders
There are mainly two types I found:
- Foam mattress extenders: These add extra cushioning and support. I liked that they were lightweight and easy to handle.
- Solid frame extenders: These physically extend the bed frame itself. They’re sturdier but less portable.
Material and Comfort
Since I’d be sleeping on the extender, I chose one with high-density memory foam. It matched my mattress’s firmness and didn’t feel like a separate piece. Look for materials that are breathable and hypoallergenic if you have allergies like I do.
Size and Fit
Make sure the extender matches the difference in size between queen and king: roughly 16 inches wider. I measured my bed frame carefully to ensure the extender would fit snugly without gaps.
Ease of Installation
I wanted something that was simple to set up. Some extenders come with straps or Velcro to hold the mattress pieces together, which I found very helpful in preventing sliding.
Durability and Support
Since the extender would support body weight every night, I looked for one with strong materials and good reviews on durability. Foam density and frame build quality matter here.
Portability and Storage
If you plan to switch back to a queen bed later, a foldable or easily removable extender is a plus. I chose one I could roll up and store without much hassle.
Price vs. Value
Prices vary widely. I balanced cost with quality—cheaper options often felt less supportive, while premium ones offered better comfort and longevity.
Additional Features
Some extenders come with mattress covers or waterproof layers. Since I have pets, I opted for a waterproof cover to protect against accidents.
My Final Tips
- Always check customer reviews for real-world experiences.
- Measure your bed frame and mattress before buying.
- Consider your sleeping habits and partner’s needs.
- Look for a return policy in case the extender doesn’t meet your expectations.
I hope my experience helps you find the perfect mattress extender to turn your queen bed into a comfortable king-sized haven!
Author Profile
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Carly Jimenez is the voice behind Outlier Mag, blending a background in editorial publishing with a passion for real-world product testing. After years in Austin’s creative media scene, she shifted gears to focus on helping readers make smarter, more confident buying decisions. Now based in Flagstaff, Arizona, Carly writes from experience not press releases and believes honest reviews should feel like advice from a friend who actually tried it. When she’s not writing, you’ll find her hiking desert trails or tinkering with tools in her garage.
Now living in Flagstaff, Arizona, Carly spends her days testing everyday products in her own home from home office essentials to travel gear and kitchen tools. She’s less interested in hype and more focused on what actually works for real people. Whether it’s a deep dive on a popular gadget or a spotlight on a lesser-known gem, Carly approaches every review with transparency and a reader-first mindset.
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