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Last Updated October 24, 2026
A King mattress is one continuous 76 x 80 inch mattress, while a Split King mattress combines two separate Twin XL mattresses (38 x 80 inches) that together provide the same overall sleeping space. A standard King gives couples one shared sleep surface, while a Split King allows each person to choose their own firmness level and adjust their side independently. This King vs. Split King guide compares both options to help couples decide which setup better suits their needs.
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Key Takeaways:
King and Split King have the same width and length; the only difference is the noticeable gap between Split King, which separates it into two beds.
| Mattress Size | Dimensions (inches) | Dimensions (feet) | Dimensions (cm) |
|---|---|---|---|
| King | 76 x 80 | 6.33 x 6.67 | 193.04 x 203.2 |
| Split King | 76 x 80 (38 x 80 each side) |
6.33 x 6.67 (3.17 x 6.67 each side) |
193.04 x 203.2 (96.52 x 203.2 each side) |
Use this comparison table to find out all the differences between owning King and Split King beds.
| Feature | King | Split King |
|---|---|---|
| Best for | Couples who want one shared mattress, co-sleeping families | Couples who want more control over their side of the bed |
| Dimensions | 76 x 80 inches | 76 x 80 inches (38 x 80 each side) |
| Sleeper Capacity | Two adults + children/pets | Two adults |
| Minimum Room Size | 12 x 12 ft | 12 x 12 ft |
| Cost | $800 to $2,800 | $800 to $2,800 (maybe $100 more) |
| Bed Frame Size | 78-81 x 82-85 inches | 78-81 x 82-85 inches (or two Twin XL bases) |
| Weight Limit | 600 to 700 lbs. | 600 to 700 lbs. [combined weight] |
| Bedding Availability | Extremely common | Common |
Here's how King and California King mattresses compare in terms of sleeping space, room space, bedding, price, bed frames, and overall versatility.
Both setups provide the same overall sleeping area. A Split King consists of two 38 x 80 inch Twin XL mattresses placed side by side, creating the same total width and length as a standard King.
The extra flexibility of a Split King comes from having two separate mattresses. You can customize your side the way you like best. If you want a different firmness, or a different adjustable base position than your partner, you can definitely do that with a Split King setup.
A bedroom measuring 12 x 12 feet is the minimum recommended for a King and Split King size bed, as it provides enough room to walk around the bed and accommodate other furniture. A larger bedroom gives you more space for all of these things.
When measuring, include the bed frame to determine how much space you'll need for the full setup. It gives a better estimate.
King and Split King mattresses can both use King-size bedding. For fitted sheets and mattress protectors, however, using two Twin XL sheets for a Split King bed is recommended. Using a King-size fitted sheet and protector on a Split King may cause it to slip or pop off.
King and Split King mattresses both cost around $800 to $2,800. Entry-level models, like basic foam and innerspring, range from $800 to $2,000. High-end models, like latex and hybrid, cost more, around $1,600 to $2,800. A Split King can cost about $100 more than a King sometimes, because of the split configuration.
When budgeting, include the base(s), fitted sheet(s), mattress protector(s), and other bedding, as they factor into the total cost.
King size bed frames measure around 78 to 81 inches wide and 82 to 85 inches long, and can be used for both standard Kings as well as Split Kings.
Two separate twin XL bases placed side by side also work well for Split King beds. Each twin XL bed frame measures around 40 to 43 inches wide and 82 to 85 inches long.
Adjustable bases are more popular if you're going for a Split King. With two twin XL adjustable bed frames, you can adjust your side separately from your partner's.
A standard King and a Split King mattress both support a combined total weight of around 600 to 700 lbs. With two adults sharing the mattress, make sure the listed weight capacity covers the combined weight of all sleepers. Adjustable bases have their own weight limits, so check the manufacturer's specifications for those too.
Suggested Read: Mattress Weight Limit
Standard King mattresses are widely available from most mattress brands, both online and in stores. Bed frames and bedding in King size are also easy to find.
Split King options have slightly more limited availability, especially in physical stores, since they need to be sold as a dedicated Split King set. But since Twin XL mattresses and adjustable bases are widely available, you can easily build a Split King setup by purchasing everything separately.
While both setups offer the same amount of space, the differences in their design make one more suitable than the other for couples, guest rooms, and families.
A standard King works well for couples with the same sleep preferences. It's more convenient because you don't need separate bedding. Cuddling's easier too! A Split King is required only when partners have different preferences, or if they want to use a dual adjustable base. Each person can choose their own Twin XL mattress and adjust their side independently.
A standard King mattress is more practical for families who co-sleep with children/pets. There is no center seam between the two mattresses. With a Split King, the center seam will make it less comfortable for children sharing the bed.
In a guest room, a standard King mattress offers a simple, familiar setup for most couples. A Split King is a better fit when the room has a dual adjustable base. The two Twin XL mattresses are also easier to move through narrow doorways and tight spaces. But if none of that's a concern, a regular King bed is ideal.
Choose a King mattress if you:
Choose a Split King mattress if you:
Motion transfer is pretty much non-existent on a Split King, as the mattresses aren't joined together like a standard King, so you won't be disturbed easily. If you're prioritizing motion isolation along with adjustable firmness, go for a Split King. If not, a regular King is sufficient.
If you need more sleeping space, consider an oversized King mattress such as a Wyoming King (84 x 84 inches), Texas King (80 x 98 inches), Vermont King (96 x 96 inches), or Alaskan King (108 x 108 inches).
Found the right mattress size? That's great! Now, the next step is choosing one that fits your sleep style. Turmerry offers natural latex mattresses in both King and Split King sizes, with firmness options ranging from soft to extra firm. Each mattress is made with certified organic materials and backed by a 120-night sleep trial, free shipping, free pillows, and up to 20 years of warranty.
Note: In our Split King mattress, the latex layers are divided into two while the mattress cover remains one continuous piece.
Disclaimer: What is said in this article has been referenced from multiple sources and is intended only for educational and informational purposes. Please note that no content in this article is a substitute for professional advice from a qualified doctor or healthcare provider. Always consult an experienced doctor with any concerns you may have regarding a health condition or treatment, and never disregard any medical suggestions or delay in seeking treatment because of something you read here.
