Split king is the only king-width setup where each side moves independently. These are the bases we've tested that are genuinely available in Split King — with the real cost for the pair.
One remote that pairs both sides
Or you operate two separatelySlides you back as the head lifts
Keeps nightstands reachableClips the two bases together
Stops mid-night drift
Top-of-the-line adjustable base with app control and smart home integration
850 lbs per side
Motors: Triple Okin motors
$1,799 per Twin XL base
Luxury adjustable base with dual tilt pressure relief and Bluetooth
850 lbs per side
Motors: Triple motors with dual tilt
$2,299 per Twin XL base
Hi-Low smart bed with health monitoring, voice control, and adjustable height
750 lbs per side
Motors: Multi-motor system with hi-low lift
$4,399 per Twin XL base
Smart adjustable bed for athletes with health ecosystem integration
750 lbs per side
Motors: Silent Drive dual motors
$1,899 per Twin XL base
Premium adjustable base with pillow tilt, massage, and smart home integration
800 lbs per side
Motors: Triple motors with pillow tilt
$1,599 per Twin XL base
Hi-low adjustable bed with full-bed tilt — ideal for mobility and stomach sleepers
750 lbs per side
Motors: Multi-motor with hi-low lift and tilt
$1,799 per Twin XL base
Premium adjustable base with wall-hugging design and full-body massage
850 lbs per side
Motors: Dual Okin motors
$1,395 per Twin XL base
| Configuration | Dimensions | Independent sides? | Mattresses needed |
|---|---|---|---|
| Split King | 76 x 80 in (2 x 38 x 80) | Yes | Two Twin XL |
| Standard King | 76 x 80 in | No — moves as one | One King |
| Split Cal King | 72 x 84 in (2 x 36 x 84) | Yes | Two Split Cal King halves |
| Cal King | 72 x 84 in | No — moves as one | One Cal King |
A split king adjustable bed is two Twin XL bases placed side by side under two Twin XL mattresses, together measuring the same 76 by 80 inches as a standard king. Each side raises, lowers and reclines independently, so one partner can sit up to read while the other lies flat. It is the only king-width configuration that allows independent articulation — a solid king adjustable base moves as one piece.
Yes. A split king requires two Twin XL mattresses, one per base. A single king mattress cannot flex in two directions independently and will be damaged if forced onto a split base. The upside is that each partner can choose their own firmness — a common reason couples pick split king even when they don't need independent articulation.
Yes, the footprint is identical. Two Twin XL mattresses measure 38 by 80 inches each, which together equal a king's 76 by 80 inches. Standard king sheets fit the combined surface, though most split-king owners use two Twin XL fitted sheets plus a king flat sheet or comforter so each side can move without pulling the bedding.
Use a split-king bed connector strap or a foam gap filler wedge that sits in the seam and is held in place by the fitted sheets. Many adjustable base makers also sell a set of retaining brackets that clip the two bases together at the head so they cannot drift apart while articulating. If you want the sides to move together, look for a base with a sync feature that pairs both remotes.
Usually yes, provided the frame is a platform or has a solid perimeter rail rather than a center-slat system, and the interior dimensions are a true king. Look for a base with a zero-clearance or low-profile leg option that drops the base inside the existing frame. Wall-hugger designs matter here too — they slide you back as the head raises so your nightstand stays in reach.
Because a split king is two complete bases, it costs roughly double the Twin XL price. Entry models land near $1,600 for the pair, mid-range bases with massage and app control run $2,200 to $3,600, and premium hi-low or health-sensor systems reach $8,000 and up. Bases are also frequently bundled at a discount when purchased with two Twin XL mattresses.
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