The Best King-Size Mattresses, Reviewed By Forbes Vetted Sleep Experts

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Our mattress and sleep editors reviewed all of the top options in 2024 to find the best king-size mattresses that excel in both roominess and comfort. The Nectar Premier Copper is our favorite overall because its medium-firm feel and availability in both memory foam and hybrid models accommodates a wide range of sleep preferences. See the rest of our king-size recommendations below.

We spend a lot of time thinking about sleep here at Forbes Vetted. We’ve researched more products than we care to count, and, like everyone, we snuggle up in our own mattresses each night. Our mattress experts — senior mattress editor Bridget Chapman, mattress editor McKenzie Dillon, executive strategy editor Lindsay Boyers and senior strategy editor Katie Simpson — have tested hundreds of beds throughout their careers, carefully evaluating which ones are best for certain types of sleepers. We’ve written dozens of guides on mattresses and bedding based on their hands-on expertise, from the best beds by size (twin, full, queen and king) to the top adjustable mattresses.

To ensure our advice stays up to date, we regularly refresh this story with new information and products as they’re released. It was last updated in November 2023 by Vetted sleep and mattress editor Mckenzie Dillon with new best list additions and insights on her experiences with the beds chosen.

To put together this list of the best king-size mattresses, we combined our mattress-testing expertise with hours of thorough research. We started by looking at popular king-size models from well-known brands, like Nectar, Helix, DreamCloud, Saatva, Tempur-Pedic, Avocado and Puffy. We then narrowed down our list by evaluating each bed across key categories that matter most for king-size mattresses like durability, support, temperature regulation and pressure relief.

Each mattress that we selected is also highly reviewed by customers like you, and the companies offer generous trial and warranty policies — because it’s hard enough to buy a mattress online, you have to sleep on the thing to really know whether you like it. Finally, we made sure to add non-standard sizes, like split and California kings, for anyone who needs them.

King-size mattresses take up a lot of floor space. At 76 by 80 inches, these beds require a bigger bedroom than a queen-, full- or twin-size mattress. Be sure to measure your bedroom before purchasing a mattress to ensure it can fit comfortably in your space. By contrast, a California King mattress is slightly narrower and longer than a standard king at 72 by 84 inches.

The best king-size mattresses are available in a variety of firmness levels, but the right feel for you ultimately depends on your sleep position and body weight. For example, a soft mattress tends to be best for side sleepers or lightweight sleepers, whereas a firm or medium-firm mattress is generally the better choice for back sleepers, stomach sleepers and people with back pain. And if you’re a heavyweight sleeper, consider a firm mattress for sturdy support.

Some king-size mattresses are built to help minimize how much movement travels from one side of the bed to the other. This feature is called motion isolation, and it’s important to keep in mind if you share a bed with a partner, especially if they regularly toss and turn or get up to use the bathroom at night. All-foam mattresses tend to offer better motion isolation than hybrid models, but a hybrid mattress (like the DreamCloud) can still be a good choice if you aren’t a fan of the sink-in feeling of memory foam.

Edge support refers to how well the edge of the mattress withstands pressure if you sit on it to tie your shoes or sleep clinging to the side. This tends to be more of a concern with queen size mattresses and smaller just because those beds are more cozy for two people, and you may wind up right on the edge whether you want to or not. However, if you like sleeping toward the end of the mattress or need extra support when getting in and out of bed, make sure the mattress you choice provides ample edge support.

King-size mattresses are big and heavy, so we advise planning exactly how you’ll be getting the bed set up inside your home before finalizing any purchases. Some brands — like Saatva and Tempur-Pedic — offer white-glove delivery, so it’s something to consider if you’d rather have someone else do the heavy lifting for you. (Saatva offers this service for free, but other brands may charge you $150 or more for white glove delivery.)

The best king size mattress starts with finding the best mattress for you. We named the Nectar Premier Copper our top king size mattress overall thanks to its crowd-pleasing features including hybrid construction, cooling features and great price. That said, we included picks to cater to different sleep needs and feel that each model on this list is the best in its category.

The bigger the mattress, the pricier it is. As such, king size mattresses are usually the most expensive of any model (with the exception of specialty sizes like California or split king mattresses, of course). You can generally expect to spend anywhere between $1,000 and $4,000 (or more) for a quality king size bed. Exact prices will vary based on materials and construction. The cost of beds on this list ranges from $1,299 to $3,395.

It’s a common misconception that California kings have larger dimensions, overall, than king mattresses. The surface area of the two is actually very similar. The biggest difference is in the height of the mattress. A king is the largest standard size bed you can buy and measures 76 inches wide by 80 inches long. A king can comfortably accommodate two adults plus small children and/or pets. California kings, sometimes called Western kings, have grown in popularity and are available at many online retailers now. This size is narrower yet longer than a traditional king mattress. These mattresses measure 72 inches wide by 84 inches long. California king beds are ideal for taller individuals.

Great king-size beds come in many forms. Check out the following stories for more mattress options:

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