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Best King Size Mattress

Our picks for the top rated king size mattresses that you can buy right now.

Last Updated: May 28, 2020

In our reviews, we discuss our selections for the best rated king size mattresses that you can purchase online right now. We have a number of picks that vary in price, design, comfort, and firmness level.


  • Mattresses Reviewed


  • Brands


  • Made the List

  • Number of Contributors

The Best King Size Mattresses Online

Ah, the king size mattress. A clear indication that you’re either an adult in a relationship or you’re tall. Regardless, you’re obviously looking to step up (or replace) your mattress game. Well, we’re here to help. Here’s our list of the top rated king size mattresses on the market.

What’s a list without any context, though? Keep reading for more reviews about what you should look for in a new mattress. Hopefully, with the help of this buyer guide, you’ll be able to upgrade your bedroom and get the best king mattress for you.

Leesa Hybrid Soft Foam 15% Off Code: SLUMBERYARDLeesa Hybrid features 6″ pocket coils and various soft foams. It’s a luxury mattress without the egregious price tag.
Nest Bedding Alexander Hybrid Pillow Top 20% Off Code: SUMMERLOVENest Alexander Hybrid is a pillow top mattress that comes in multiple firmness options and is backed by a lifetime warranty.
WinkBeds Classic Pillow Top $300 Off Code: SLEEP300WinkBed is a thick, durable hybrid mattress that includes a comfortable euro pillow top. In our opinion, it’s one of the best mattresses you can purchase online.
Helix Dawn Mixed Foam $100 Off + Gift Code: SY100Dawn is a firm mattress from Helix Sleep. It has pocket coils and dense foams such that we think back and stomach sleepers in particular will really like this bed.

What Is The Best King Size Mattress?

How do you know when it’s time to get yourself a king size mattress? Here are a few indicators:

  • You keep falling out of bed because your mattress is exactly 16” too narrow.
  • You can’t find your tiny queen size bed in your giant bedroom.
  • You and your partner want to share a bed, but you don’t want to cuddle or touch at all.

Jokes aside, if you have the space in your room, a king size bed is a great option for tall folks who need extra sleeping area. For example, our resident tall guy, JD at 6’5”, sleeps diagonally on a king mattress.

We also suggest a king size mattress for people with wider builds. It’s easy to feel cramped on a full size or a queen, especially if you’re sharing the bed. Lastly, a king bed is also really nice for couples because, as much as you love your partner, sometimes you really do just need your space to sleep well.

Sapira is the coil version of the Leesa mattress, and, therefore, it not only costs more, but also is more supportive. In fact, for individuals weighing over 250 lb, we definitely recommend Sapira over Leesa. It still has a neutral, comfy feel, but it mixes in pocketed coils for added durability.

leesa hybrid mattress review cover
Leesa gets great reviews, almost across the board

While there are cheaper mattresses out there, Sapira made the list because it’s a safe pick, especially if you sleep on your back or stomach at night. In terms of firmness, Sapira comes in at about a medium+, although softness/firmness is a subjective element and will differ from person to person.

leesa hybrid mattress firmness

The heavier you are, the softer a bed will feel—and, in the case of Sapira, the closer the bed will feel to being a medium on the softness scale. Regardless, it responds quickly to pressure and has zero of that stuck-in-the-mud feeling. You can read more by going to our mattress reviews page.

The Nest Bedding Alexander mattress is on a short list of beds that almost always gets people to say “Wow, this is unbelievably comfy!” Now, to be fair, most new beds are immediately comfortable, but there’s something about this particular bed that’s not normal—in a good way.

The mattress is constructed with coils, foam, and a giant pillowy cover. What’s nice, however, is that it’s available in three firmness levels (Plush, Medium, Luxury Firm) so that there’s an option for everyone.

nest alexander signature series mattress review cover
If you like fluffy mattresses, you’ll like Nest Alexander

While the bed does have memory foam—albeit a minor amount—it has a neutral feel, almost like an over-sized pillow. We found the Medium option (most popular) to be between a medium-soft and medium on the softness scale.

We think it’s plenty soft and plenty pressure relieving enough for side sleepers. It wouldn’t be our favorite option for back and stomach sleepers, but that’s why they offer the firmer model

nest bedding hybrid firmness

All Nest Bedding mattresses are backed by a lifetime warranty and lifetime comfort guarantee. You can read more in our full review, but the short of it is that Nest stands behind their products and is so committed to making people happy that they’ll discount a new bed for you if your current Nest mattress isn’t exactly what you’re looking for. And that is in addition to offering the risk-free 100-night sleep trial.

WinkBed belongs in the home of royalty or some rich celebrity—that’s how nice it looks and feels. This is a 14.5″ thick bed that incorporates two layers of coils, proprietary foams, and a plant-based tencel cover. It might not be our favorite bed to move (it’s heavy), but it’s one of our favorites overall.

winkbed mattress review main image wink bed cover of bed
WinkBed is a hefty mattress that checks a lot of boxes.

Regardless of which firmness level you select (they offer three), WinkBed has a neutral, pillow-top feel. It’s a bit like Nest Alexander, but more airy. It’s fluffy and comfy, yet almost unmatched in terms of support.

WinkBed even makes a model called WinkBed Plus that’s designed for individuals weighing up to 500 lb. This very well could be the most durable mattress available online right now. So, for anyone that’s counting, they make three normal models (Softer, Luxury Firm, and Firmer), as well as an updated model for heavier folks.

winkbed mattress review firmness and feel

WinkBed also backs their mattress with a lifetime warranty and a comfort replacement plan. It’s actually surprising to see this caliber of a mattress for under $1,500, and that’s before any discounts.

When we mention the Helix mattress we’re usually referencing a collection of beds, not just one. In fact, in years past, Helix used to showcase just one mattress, despite the fact that they actually made several different models. This is really the engine behind their “custom” mattress concept. Helix made around 10 mattress models for individuals of all shapes and sizes.

Now, that might seem confusing, but what Helix does is run consumers through a sleep quiz on their site to narrow their search to the most optimal mattress. It really is a clever concept and it’s one of the reasons that Helix is so popular.

helix mattress review firmness and models

The most popular model that Helix makes is called Midnight. It’s about a medium on the softness scale and also about a medium in terms of overall support. It’s a nice bed, but Helix recognizes that it’s not for everyone, which is why they offer 14 other beds.

helix mattress review side sleepers
We can’t imagine people not liking what Helix has to offer

If you’re looking for a firm, supportive bed, they make that. If you want a super soft, pressure relieving bed, they also make that. If you want a mattress with a big, comfy cover, they have that also. Again, the whole goal of Helix is to offer a bed for everyone, and they make a darn good king mattress.

Review team

  • Owen Poole

    Side Sleeper

  • kenzie
    McKenzie Dillon

    Combo Sleeper

  • Tharon
    Tharon Green

    Stomach Sleeper

  • Dillon Payne

    Combo Sleeper

What Do We Know About Mattresses?

A lot, actually! Here at the Slumber Yard, we’ve reviewed upwards of 150 mattresses, and published many of them on our mattress reviews page. For every review we test feel, firmness, edge support, temperature regulation, motion isolation, and more.

We’re not interested in proving a company’s buzzy marketing claims, we just want to report accurate information about the best king mattress. Which is why we do our best to be transparent in our testing methods and relationships with various companies.

It’s important to us that our readers know we can be trusted and know that we try to only recommend the best rated mattress. We work independently of the brands we test, so even if we’re gifted a mattress, we have full control of content. We’ll never oversell a product and we’ll never sell it short either.

What Is A King Size Mattress?

A king size mattress is a size up from a queen mattress, but not as long as a California king. It’s the bed you get when your new room is extra spacious, the bed you put in your first home as a married couple, the bed you finally get to stretch out on.

Compared to a queen, a king mattress will get you an additional 16” in width (about 25% overall), though both sizes are 80” in length. That’s part of the reason a king mattress is the best rated size overall.

You can see a breakdown of standard mattress dimensions in the table below:

best mattress california king size

Body Type

We touched on body type in relation to the best rated king size beds a bit in the above section, but let’s expand and talk about body type in relation to mattresses in general.

When you’re shopping for a mattress online, it’s more than likely that you won’t be able to try the bed before you buy it and have it shipped to your home. So, instead, you’ll have to rely on the descriptions and reviews.

When you’re reading up on a bed’s feel and firmness, always keep in mind that these things are relative to your body weight. The heavier you are, the softer a mattress will feel for you, and the lighter you are, the firmer that same mattress will feel for you.

It’s also a good idea to consider your body type when deciding on what type of mattress construction you want. We generally suggest that heavier folks look for coil spring mattresses for added support, durability, and airflow.

Sleeper Type

Your sleeper type plays an important role in choosing a mattress that’s right for you. There are four categories of sleepers that we talk about in our content: back, stomach, side, and combination sleepers.

Back sleepers and stomach sleepers need to look for a bed that will provide enough support for their shoulders and hips. If these heavier parts of the body aren’t properly supported, the spine can arch, causing you to wake up with aches and pains. Typically, these sleepers will prefer a firmer overall bed—obviously the king size mattress—as opposed to something on the soft side of the spectrum.

Side sleepers, on the other hand, need proper pressure relief for the hip, arm, and shoulder. If the bed is too dense or doesn’t have enough give in those areas, it will feel like the surface of the mattress is fighting against your body, rather than accommodating it. Again, this can cause a sore wake up in the morning.

Combo sleepers are less defined because some combos spend a lot of time on their back, others spend most of the night on their side, and some split all positions evenly. If you’re a combo sleeper, we suggest you cater to your predominate sleeping position, while considering your body type. We also suggest looking for a mattress with good responsiveness so that you don’t ever feel stuck in the mattress and turning over is easy.

Two More Things For Couples

We thought we should talk about couples in this post because most mattress buyers are looking for a king mattress so that they can share it.

There are a couple of mattress factors that we always like to highlight when it comes to couples: edge support and motion isolation. These will be important when it comes to finding the best rated mattress.

Edge support refers to the sturdiness of the sides of a bed. Some mattresses are very soft around the sides, but others are quite stiff. We prefer the stiff edges because they allow you to sleep right on the edge of the bed without feeling like you’re going to roll off onto the floor.

For couples, this is something to think about because it’s fairly common for one partner to hog the middle and the other to end up confined to the mattress’s outside inches.

Motion isolation is another key component of getting a restful night’s sleep while sharing a bed. If a bed has good motion isolation, that means it deadens cross-bed motion. So if one partner tosses and turns all night (or is a light sleeper), or likes to sneak out of bed for a midnight snack, it won’t jostle the other person awake.

If you get a king mattress, in large part, you don’t have to worry so much about the motion isolation and edge support issues since your bed is at least 25% larger in terms of overall space. Put simply, the king mattress is the best option if you share your bed.

About Our King Mattress Reviews

It is worth nothing that this list contains the best rated king mattresses, but we have also posted reviews about many more. Not only that, but we’ve included links to our full reviews for our top picks that way you can learn more if you’d like. We want to make sure that you’re 100% happy with your new bed!

What are the dimensions for the king size mattress?

A king mattress is 76″ wide and 80″ long.

What’s the difference between a king and Cal king?

The king is wider, but shorter than the California king. The king is 76″ W x 80″ L while the California king is 72″ W x 84″ L.

How much does a king mattress cost?

Prices range from about $1,000 to $3,000 for a king mattress.

Who is the king mattress best for?

The king size mattress is designed just for couples.