King-size mattresses are great for couples who want more room, as well as single sleepers who need space to spread out, since they have 16 inches of extra width compared to queen-size beds. King-size mattresses are more expensive and more difficult to move, so you'll want to be sure you're investing in the right model when you buy one. Here are some important considerations for choosing a king-size mattress using our lab testing and scores:
- Support and pressure relief: These are necessary for spine alignment and comfort. Look for a score of at least 7.0 for your and your partner's sleeping position and weight category.
- Motion Isolation: A king-size mattress's larger sleeping surface helps with motion isolation, since you're farther away from the source of movements, like someone getting in or out of bed. If motion is a concern, look for a motion isolation score of at least 7.5.
- Cooling: While a king-size mattress will help you feel less warm by giving you more space to spread out, hot sleepers should still look for a mattress with a cooling score of at least 8.0.
- Edge Support: A mattress with sturdy edges will let you comfortably share the entire king-size sleeping surface. Look for a score of 7.5 or more for good edge support.
- Longevity: If you invest in a king-size mattress, you'll want it to last. Avoid models that use only low-quality materials by looking for scores of at least 6.5.
We've tested over 65 mattresses, and below you'll find our recommendations for the best king mattresses for most people. We test queen-size mattresses, but the feel should be the same across sizes if the construction is the same. If you're interested in a Queen-size mattress, check out our recommendations. For our King-size recommendations, we've prioritized longevity, which is especially important with pricier King-size models, as well as edge support and motion dissipation, which are particularly important for couples.
We've tested over 55 mattresses. We purchase each unit independently from major retailers, just like you, to keep our reviews free of manufacturer influence. Each mattress undergoes the same tests to measure objective data on characteristics like firmness, cooling, and motion isolation, so you can easily compare results. Since we buy all our mattresses, we can tear them down layer by layer and isolate the mechanical properties of every component: quilted tops, foams, coils, and any special materials.
Want to learn more about how we operate? Check out our About Us page.
-
Best King Size Mattress
Side Sleeping8.2Back Sleeping7.4Stomach Sleeping7.2Motion Dissipation8.2Cooling8.2Longevity6.8See all our test resultsFirmness Level:Medium (44 Pa/mm)The Helix Midnight Luxe 2025 is the best king-size mattress we've tested. This Medium hybrid's versatile performance and strong cooling and edge support make it a great king-size option. Its quilted and memory foam layers help it provide an enveloping feel, while a pocket coil layer creates adequate support for most people, so overall, it's ideal for a range of side sleepers. Plus, when we cut open the mattress and measured the density of each foam layer, we found that most are made of good-quality foam, which will help it maintain its performance and feel for longer.
Pick if: You want an enveloping mattress with strong cooling and edge support.
Skip if: You're a dedicated back/stomach sleeper and need more support.This mattress is also suitable for couples, with very sturdy edges that give you more space for sharing. Its great motion isolation means you won't feel smaller movements. That said, the biggest movements will still cause the mattress to bounce or wobble a bit, so you're more likely to be disturbed by someone getting into bed, for example. It dissipates heat efficiently enough for hot sleepers, especially over eight hours, so it's a good option for hot sleepers who often wake up later in the night feeling overheated. However, if you often sleep on your back or stomach, you might want a bit more support. The mattress only comes in one firmness level, but you can add an 'Ergo Align Support Layer', which is an extra layer of foam in the lumbar area meant to keep your hips elevated and aligned with the rest of your body.
-
Best Mid-Range King-Size Mattress
Side Sleeping7.9Back Sleeping7.7Stomach Sleeping7.6Motion Dissipation9.0Cooling8.4Longevity6.3See all our test resultsFirmness Level:Medium (46 Pa/mm)Consider the Tuft and Needle Mint if you're looking for a less expensive king-size bed, especially if you sleep with a partner and want stronger motion isolation. This all-foam mattress offers good support and pressure relief for most body types and sleeping positions, making it a great option for combination sleepers and couples with different needs. You'll sink quite deeply into it, like the Helix Midnight Luxe 2025, but it's much less contouring and more responsive, so it's also a good option if you feel constricted by hugging mattresses.
Pick if: You're looking for a comfortable king-size mattress for you and a partner.
Skip if: You prefer springy hybrid mattresses.This mattress also offers better motion isolation, so you'll feel fewer movements across the mattress. We also measured faster motion dissipation, so you won't feel the mattress wobble or bounce, even with bigger movements. Sturdy edges allow you to sleep near the side of the mattress, and great cooling makes it a good option for hot sleepers. It's also a moderately durable mattress, with some good and high-quality foam layers that will help the mattress resist sagging for longer.
-
Best Budget King-Size Mattress
Side Sleeping7.4Back Sleeping7.4Stomach Sleeping7.5Motion Dissipation8.6Cooling7.9Longevity6.7See all our test resultsFirmness Level:Medium (42 Pa/mm)The Casper Cooling Select is a great budget-friendly king-size mattress with a comfortable feel and good performance for single people and couples, as long as you don't sleep hot. This Medium all-foam mattress offers good support and pressure relief for most people, so it's a good option for most side and combination sleepers. The exception is lighter side sleepers, since it doesn't allow as much sinking as the Tuft and Needle Mint, and won't relieve as much pressure on your arm and shoulder.
Pick if: You want a budget-friendly king mattress with a fairly durable design
Skip if: You're a hot sleeper or a lighter side sleeperIt's suitable for couples looking for a king-size bed, since sturdy edges let you take advantage of the entire king-size sleeping surface, and excellent motion isolation makes your partner's movements less likely to wake you. Despite its budget-friendly price, it's a reasonably durable mattress with layers of high-quality foam that help it resist indentations and impressions. However, while it's cooling enough for most people, it's not ideal if you're a hot sleeper, especially if you want a mattress with a refreshing feel when you first get into bed.
-
Best Cheap King-Size Mattress
Side Sleeping6.7Back Sleeping7.3Stomach Sleeping7.5Motion Dissipation8.8Cooling8.3Longevity6.0See all our test resultsFirmness Level:Medium-Firm (54 Pa/mm)If you're looking for a cheap king-size bed and don't mind sacrificing some durability, you might prefer the Allswell Hybrid. This inexpensive mattress includes lower-quality foams and shows signs of wear before more durable options like the Casper Cooling Select, but if you want more sleeping space at an affordable price, it's a versatile option with a solid all-around performance. While its somewhat firm comfort layers don't let you sink in as much or provide as much pressure relief as the previous pick, it's suitable for a range of sleepers. It's particularly well-suited for combination sleepers, since its bouncy, very responsive design makes changing sleeping positions feel easy.
Pick if: You're looking for a cheap option and prefer springy mattresses for ease of movement
Skip if: You want a more durable mattress or you're a lighter side sleeperIts motion isolation isn't quite as good as the previous pick's, so you'll feel some smaller movements as well as bigger ones. Still, motion dissipates quickly and isn't felt all over the mattress, so it's suitable for couples. The edges are also very sturdy, so you can comfortably use the entire sleeping surface. It'll also keep most people cool overnight, including hot sleepers, although you might find it a bit stuffy when you first get into bed.
For more inexpensive options, check out the best affordable mattresses.
-
Best King-Size Mattress For Cooling
Side Sleeping7.1Back Sleeping6.8Stomach Sleeping6.7Motion Dissipation8.3Cooling9.9Longevity7.4See all our test resultsFirmness Level:Medium (45 Pa/mm)The Purple RestorePlus Hybrid is our recommendation if you sleep hot and need a king-size mattress that will keep you cool. This Medium hybrid's grid-shaped comfort layer doesn't allow much sinking, and as a result, doesn't create as much pressure relief as other options like the Helix Midnight Luxe 2025. However, its outstanding cooling performance makes it worth trying if most mattresses make you feel overheated. We measured exceptional cooling when you first get into bed and for over eight hours.
Pick if: Most mattresses make you feel overheated.
Skip if: You want an enveloping feel or you're a lighter side sleeper.If you sleep hot, you might like that you don't sink into it very much, since it avoids making you feel constricted or enveloped by foam. The grid-shaped comfort layer helps with cooling, but not everyone will like feeling the grid's shape under the mattress cover. That said, it has a springy and responsive feel that will suit hot sleepers who don't want to feel hugged or enveloped. The mattress's strong edge support lets you sleep comfortably near the edge when you need more space. It's also a reasonably durable mattress, with good-quality foam layers that will help it resist sagging. However, it only comes in one firmness level and isn't very comfortable for lighter side sleepers.
If cooling is a big priority, you might be interested in our recommendations for the best cooling mattresses.
Notable Mentions
-
Casper Snow:
The Casper Snow is a high-end Medium mattress that you might prefer to the Helix Midnight Luxe 2025 if you like a mattress with a more enveloping, hugging feel. It's very versatile and better suited to lighter side sleepers in particular, but it's not as durable and might make you feel stuck in place. It doesn't have very good edge support either, although you might not mind if you're a single sleeper.
See our review -
Sleep On Latex Hybrid:
The Sleep On Latex is a Firm mattress with a very durable design. It offers much better support than the Helix Midnight Luxe 2025, so you might prefer it for back or stomach sleeping. However, it doesn't offer much pressure relief and won't work for most side sleepers. If you prefer a firmer mattress, you might be interested in the best firm mattresses.
See our review
Recent Updates
-
Sep 08, 2026 at 12:25 pm:
We made the Helix Midnight Luxe 2025 our top pick, as it offers better cooling and motion isolation than our previous pick, the Beautyrest Black. We also replaced the Silk & Snow Mattress with the Casper Cooling Select in the budget category because it's cheaper and offers better edge support.
-
Aug 03, 2026 at 01:25 pm:
We updated the article to provide price-based recommendations and to focus on Medium mattresses that are comfortable for most people. We replaced the Saatva Latex Hybrid with the Beautyrest Black as our top recommendation and the Tuft and Needle Mint with the Big Fig in the mid-range category. The Helix Midnight Luxe 2025 was moved to the upper mid-range spot, and the Sleep On Latex Hybrid was moved to the Notable Mentions.
FAQs
King vs. California King: which size is better for you?
King size mattresses (76" X 80") are four inches wider than California King-size mattresses, but four inches shorter. A standard King bed is wider, which gives you more room if you sleep with a partner, while a California King is longer, which you might prefer if you're a taller person or have a pet that curls up at the foot of the bed.
Does the same mattress feel different in King and Queen sizes?
We expect a mattress's feel and performance to be similar across sizes, as long as the construction is the same. However, if you sleep with a partner, you'll be closer on a narrower Queen-size bed, which can make motion and heat more noticeable and make motion dissipation and cooling particularly important.
What matters most when paying more for a King-size mattress?
If you're investing in a king-size mattress, you may want to prioritize durability and avoid mattresses that only include lower-quality materials. Otherwise, strong edge support will allow you to enjoy the entire king-size sleeping surface without feeling like you're at risk of sliding out of bed.
All Reviews
These recommendations above are what we think currently represent the best king-size mattresses for most people. Alongside test results, we factor in visitor feedback, availability, and, of course, price.
That said, the best mattress for you depends on your and your partner's sleeping positions, body types, and specific preferences, like cooling or motion dissipation. If you want to choose yourself, here's a list of all of our mattress reviews.