What Is a Split King Adjustable Bed? A Complete Beginner's Guide
A split king adjustable bed lets each partner control their own side of the bed independently. Here's everything you need to know before buying one — how they work, what they cost, and whether one is right for you.
How a Split King Adjustable Bed Works
A split king adjustable bed is simple in concept: two Twin XL adjustable bases placed side by side, each with its own motor and remote control. Together, they form a king-size sleeping surface (76" x 80"), but each half operates independently.
Think of it as two separate beds that look like one.
The Components
2 Adjustable Bases
Twin XL size (38" x 80") each. Contains motors for head and foot elevation. Each has its own remote or app control. Some include massage, under-bed lighting, and USB ports.
2 Twin XL Mattresses
One per base. Must be compatible with adjustable bases (memory foam, latex, or hybrid — not innerspring). Each person can choose a different firmness level.
Bed Frame (optional)
A king bed frame contains both bases and prevents separation. Not required but strongly recommended.
Split King Sheets
Two Twin XL fitted sheets + one king flat sheet. Regular king fitted sheets won't work. See our sheet guide
Size Comparison: Split King vs. Other Beds
| Size | Dimensions | Per Person | Independent? |
|---|---|---|---|
| Twin XL | 38" x 80" | 38" (1 person) | N/A |
| Queen | 60" x 80" | 30" | No |
| King | 76" x 80" | 38" | No |
| Split King | 76" x 80" | 38" | Yes |
| Split Queen | 60" x 80" | 30" | Yes |
Notice that a split king gives you the same total space as a regular king — the only difference is that each side moves independently.
Pros and Cons of a Split King Adjustable Bed
Pros
- +Independent control — Each partner adjusts their own side
- +Different firmness levels — Choose different mattresses for each side
- +Zero motion transfer — Movement on one side doesn't affect the other
- +Health benefits — Elevate head for snoring/GERD, feet for circulation
- +Widest selection — Most brands offer split king
Cons
- -Center gap — A seam between the two mattresses (fixable)
- -Higher cost — Two bases + two mattresses = roughly 2x the price
- -Special sheets needed — Must buy split king or Twin XL sheets
- -Bases can separate — Need frame or connectors to keep together
- -Room size — Needs at least 12' x 12' room
Who Should Get a Split King Adjustable Bed?
A split king is ideal if:
- You and your partner have different sleep needs — one snores, one has reflux, one reads in bed, etc.
- You want different mattress firmness levels — one likes firm, one likes soft
- One partner is a restless sleeper — split bases eliminate motion transfer completely
- You have health conditions — GERD, sleep apnea, back pain, poor circulation (see seniors guide)
- Your room fits a king bed — you need at least 12' x 12'
A split king probably isn't worth it if you're a single sleeper (get a Queen or Twin XL adjustable instead), you're on a tight budget, or your room is too small for a king.
How Much Does a Split King Setup Cost?
A complete split king setup requires buying components separately (or as a bundle). Here's a realistic cost breakdown:
| Component | Budget | Mid-Range | Premium |
|---|---|---|---|
| 2 Adjustable Bases | $1,100 | $2,000 | $4,400 |
| 2 Twin XL Mattresses | $600 | $1,400 | $3,000 |
| Bed Frame | $200 | $400 | $800 |
| Split King Sheets | $35 | $80 | $200 |
| Total | $1,935 | $3,880 | $8,400 |
Ready to pick your bases? See our best split king adjustable beds for detailed reviews and recommendations at every price point.
Frequently Asked Questions
The ABL Team
Sleep Health Researchers
Our team spends hundreds of hours testing adjustable beds, analyzing specifications, and comparing real-world performance so you can make an informed decision.
Last Updated: February 13, 2026
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