No Products in the Cart
A king size mattress measures 76" x 80", making it the widest standard mattress size available. It's the best choice for couples who want maximum sleeping space and for families who co-sleep with kids or pets. Shop the best king size mattresses at Turmerry! Made with GOLS-certified organic latex, they're built to last well over a decade. Every order comes with free shipping and a 120-night trial.
Want help finding the best king mattress for you? Try our personalized mattress quiz.
A king mattress measures 76 inches wide and 80 inches long. It's the widest standard mattress size available, being 16 inches wider than a queen, and it gives two adults 38 inches of sleeping space each. For context, a twin XL is 38 inches wide, so each person on a king gets the equivalent of their own twin XL.
The king is the go-to choice for couples who want plenty of space between them, and it's also a great choice for families who co-sleep with young kids or pets. It does need a larger bedroom to work well, though, with a master bedroom being recommended.
For couples with different firmness preferences, a split king mattress is better. Two twin XL mattresses side by side, each customized to the sleeper on that side, in one shared king frame.
Here's a table to help you compare king mattresses with other mattress sizes:
| Mattress Size | Dimensions (W x L) | Best For |
|---|---|---|
| King | 76 x 80 inches | Couples who want maximum personal space, families who co-sleep with kids/pets |
| Twin | 38 x 75 inches | Toddlers, young kids, bunk beds, daybeds, small guest rooms |
| Twin XL | 38 x 80 inches | Tall teenagers, college dorms, single adults over 6 feet tall, split king setups |
| Full | 54 x 75 inches | Solo sleepers who want extra room to spread out, growing teens, guest rooms |
| Queen | 60 x 80 inches | Couples, solo sleepers who like extra space, standard master bedrooms (most popular size) |
| California King | 72 x 84 inches | Tall couples (over 6 feet) who prioritize extra legroom |
You should buy a king size mattress if:
If either you or your partner is above 6 feet tall, go with a California king mattress instead. The Cal king trades 4 inches of width for 4 inches of extra length, making it the better fit for taller sleepers. And if you're tight on budget, a queen mattress still offers plenty of space for two people.
Note: For couples who have very different firmness preferences, a split king mattress is recommended.
Turmerry mattresses are made with high-quality materials, including certified organic latex, cotton, wool, and pocketed coils. With benefits ranging from responsive support and contouring pressure relief to breathable cooling, they're some of the best king size mattresses you can find today.
Latex responds to your movements instantly, pushing back as you shift positions. Turmerry mattresses are built with 7-zone support, firmer under heavier areas like the hips and lower back, softer under lighter areas like the shoulders and thighs. Your spine stays aligned through the night without any single pressure point taking too much load.
Latex contours closely to the shape of your body, distributing weight evenly across the surface. This reduces pressure buildup at the shoulders and hips, which is especially useful for side sleepers who concentrate weight through those areas for hours at a time.
Latex has an open-cell structure that lets air move through it, and our perforated layers improve this further. The wool layer wicks moisture and buffers heat, keeping you warmer in winter and cooler in summer without synthetic cooling additives.
On a 76-inch wide mattress, motion isolation is especially important for couples. Latex absorbs movement well, so a restless partner, child, or pet on one side won't wake the other. The edges hold up too. Dunlop latex is dense enough to stay firm at the borders, so you can use the full 76 inches of sleeping surface without the sides giving way.
Dunlop latex doesn't sag the way memory foam and polyfoam do. A well-maintained Turmerry mattress lasts well over a decade, making it a better long-term investment than cheaper options that need replacing every few years.
Latex is naturally resistant to dust mites, mold, and mildew. Combined with the organic cotton and wool cover, Turmerry's king mattresses are a good fit for anyone with allergies or chemical sensitivities.
Turmerry mattresses carry GOLS and OEKO-TEX certifications for the organic latex, and LGA for overall quality. Every certification is third-party verified, confirming the materials are free from harmful substances and built to last.
Every king mattress ships free across the US and comes with a 120-night sleep trial. That's enough time to know whether the mattress is genuinely working for you, not just how it feels the first week.
A king bed needs at least 12 x 12 feet of floor space to leave enough room to move around comfortably. That's a bigger footprint than most standard bedrooms, so measure your room before committing. If you're adding a lot of other furniture, you'll want more than the minimum (12 x 14 feet or more).
King mattresses are priced at the higher end of the standard size range. Basic options fall between $800 and $2,000. Premium latex and hybrid models start around $1,600 and go up to $2,800 or more. Turmerry's organic latex king mattresses start at $1,799, putting them at the lower end of the premium range for materials that hold up far longer than memory foam.
If you're upgrading from a queen or smaller, your current bedding and bed frame won't fit a king. Make sure to budget for all of that on top of the mattress cost.
These are the four most popular king size mattress types you'll find on the market:
Latex mattresses are made from natural or synthetic rubber. Natural Dunlop latex (what we use in our mattresses) is the densest and most resilient of the four. It responds quickly as you move, maintains its comfort for 15 to 20 years, and doesn't trap heat the way memory foam does. It's naturally hypoallergenic too. Latex has a higher upfront cost than the other mattress types, but you won't be replacing it every few years, which makes it the best long-term value investment.
Memory foam molds to your body under heat and pressure, then slowly bounces back when you get up. It's good for pressure relief, but it retains heat and responds slowly when you change positions. Memory foam also compresses faster than latex, so the support doesn't last as long. On a king, where two people are generating heat all night, this is worth keeping in mind.
Hybrid mattresses put pocketed coils at the base and a latex or memory foam comfort layer on top. The coils keep the mattress ventilated and add bounce. The comfort layer handles cushioning and pressure relief. Hybrids have better edge support and airflow than all-foam mattresses and are longer-lasting than memory foam, too. It's a good option for couples who sleep hot or need strong edge support on a wide mattress.
Innerspring mattresses are built around interconnected coils with a thin comfort layer on top. It's the most affordable of the four and one of the coolest to sleep on due to airflow through the coils. The downsides are minimal cushioning for pressure points, poor motion isolation, and a shorter lifespan than latex and hybrid options.
Consider all of these factors before finalizing your purchase:
Sleep position and body weight together decide the right firmness. Side sleepers need a softer mattress to cushion the shoulders and hips. Back sleepers need a medium-firm mattress to keep the spine aligned. Stomach sleepers need a firm mattress to prevent the hips from sinking. Lighter sleepers need a softer feel, heavier sleepers need firmer support, and average-weight sleepers do well in the middle. For couples with different needs, a split king lets each person choose their own firmness level.
Around 10 to 12 inches is the right thickness range for most couples on a king. Two people compress a mattress more than one, so leaning toward the thicker end gives both sleepers adequate support through the base layers. Heavier sleepers should go for 12 inches or more. Thickness also affects how high the bed sits, which is worth considering for older sleepers.
Natural latex stays supportive for 15 to 20 years without sagging. Memory foam contours closely but traps heat and breaks down faster. Hybrids pair pocketed coils with a memory foam or latex comfort layer for better airflow and edge support than all-foam. Innerspring is the most affordable but wears out fastest and offers the least pressure relief.
Two people sleeping together generate more heat than one, so temperature regulation is worth prioritizing on a king. Latex has an open-cell structure that lets air move through it. A wool layer wicks moisture away and keeps temperature steady through the night. Hybrids add ventilation through the coil base. Avoid memory foam as it retains heat by default.
King size mattresses are usually priced at the higher end. You can find decent, high-quality models starting at around $1,200 to $2,000. Factor in a king size bed frame and bedding on top of the mattress cost. If you're upgrading from a queen or smaller, your current sheets won't fit a king.
On a 76-inch-wide mattress shared by two people, motion isolation is one of the most important factors. Latex absorbs movement well across the full surface. Pocketed coils in a hybrid help, too, since each coil moves independently. Interconnected innerspring coils transfer motion across the whole surface, so avoid them if you share the bed.
Strong edge support lets both partners use the full 76 inches of sleeping surface without the sides collapsing. Latex holds its shape at the borders due to its density. Hybrids with reinforced perimeter coils do this even better. Memory foam compresses at the edges under body weight, so it's best to avoid it if you need good edge support.
Two sleepers put more load on a mattress than one, so durability is something you need to pay extra attention to on a king. Latex lasts 15 to 20 years with proper care. Quality hybrids hold up for 8 to 10 years. Memory foam and innerspring mattresses can start sagging within 5 to 7 years. If you're considering an all-foam mattress, check the base foam density since low-density foam breaks down faster.
A king is the biggest standard mattress investment you can make, so take full advantage of the trial period. Look for a minimum of 60-90 nights. For warranty, 10 years is a reasonable baseline for latex and hybrid mattresses. Read what the warranty covers before buying since the details vary between brands.
On a king specifically, look for reviews from couples rather than solo sleepers. A review from a 130-lb side sleeper won't tell you much if you're a 220-lb back sleeper sharing the bed with a partner. Reviews from people who've had the mattress for two or more years are the most useful since that's when durability problems tend to show up in low-quality models.
The right bedding makes a real difference in how your king mattress feels night to night. Here's what we recommend:
A king mattress needs a sturdy base underneath it. With two people sleeping on it every night, a weak frame will cause the mattress to sag faster than it should. Platform frames work best for latex, memory foam, and hybrid mattresses. Make sure the slats are no more than 3 inches apart.
If you and your partner can't agree on firmness, a topper is a cheaper fix than buying a new mattress. Two to three inches is enough to make a real difference without raising the bed too high. For couples with very different preferences, a split king topper lets each person customize their own side.
A mattress pad adds a thin layer of cushioning and protects the surface from daily wear. On a king that sees two sleepers every night, that surface protection adds up over time.
Two people sleeping on the same mattress means twice the sweat, body oils, and chances of spillage. A waterproof protector keeps all of that out of the mattress and keeps your warranty coverage intact too.
Breathable sheets make a bigger difference on a king since two people generate more heat than one. Cotton is a reliable choice that gets softer with every wash. Check the pocket depth before buying to make sure the sheet fits your mattress thickness.
If you and your partner have different temperature preferences, a wool comforter is the best middle ground. It regulates temperature naturally without overheating either of you. Some couples on a king also opt for two separate comforters instead of sharing one.
A duvet cover protects your comforter and makes it easy to keep clean. Since it's removable, you can wash it regularly without having to clean the comforter itself every time.
