Quick answer: A split king is a King-size bed made from two Twin XL mattresses (38" × 80" each) placed side by side for a combined 76" × 80", the same footprint as a standard King. A split king bed frame holds both mattresses, usually on two adjustable bases, so each sleeper can raise, lower or choose a different firmness on their side.
Key takeaways
- Split King = 2 × Twin XL = 76" × 80" overall.
- It's made for couples who want independent adjustable bases or different mattress feel.
- The frame must fit the bases, not just the mattresses, so measure both.
- Sheets come as split-king sets with two fitted sheets and one flat sheet.
What are split king bed dimensions?
| Component | Size |
|---|---|
| Each mattress (Twin XL) | 38" × 80" |
| Combined sleep surface | 76" × 80" |
| Typical adjustable base (each) | about 38" × 80" (check your model) |
| Bed frame interior | built to your bases plus a small clearance |
Can a regular King bed frame hold a split king?
Usually, yes for size, since the footprint matches a King. If you use adjustable bases, though, the frame has to leave room for the motors and articulating deck. That often means a "surround" style frame or a headboard-only setup. A standard slatted King platform doesn't let the bases move. Measure base height, width and the clearance the motor needs before ordering.
Split king vs King: which is better?
| Split King | King | |
|---|---|---|
| Mattresses | Two Twin XL | One King |
| Independent adjustment | Yes | No |
| Different firmness per side | Yes | Only with dual-comfort models |
| Center seam | Yes | No |
| Bedding | Split-king sheet sets | Standard King |
If you sleep tall, consider a Split California King instead: 72" × 84" made from two 36" × 84" mattresses.
What should I look for in a split king bed frame?
- Solid hardwood construction that won't rack under two moving bases.
- Inside dimensions sized to your exact bases.
- Rail height that hides the bases but doesn't block their movement.
- Headboard height that still shows when the head of the bed is raised.
- Power access for the bases' cords.
How we build split king bed frames
Every Candace & Basil bed frame is bench-made in-house from solid maple hardwood — no particleboard or MDF — and built only after you order it. You choose the size, the headboard height (42" to 82"), the fabric and the finish, and we ship across the contiguous USA from our Miami showroom. If your size isn't listed on a product page, we build to your exact measurements.
We've built frames to fit customers' adjustable bed bases, including our Celine XL. Browse King beds and tell us your base model, and we'll size the frame around it.
Frequently asked questions
How big is a split king bed?
A split king is 76 by 80 inches overall, made from two 38 by 80 inch Twin XL mattresses.
Is a split king the same size as a King?
Yes, the overall footprint is the same as a standard King, 76 by 80 inches.
Do I need a special frame for a split king?
For two regular mattresses a King frame works. For adjustable bases you need a frame that leaves room for the bases to move, such as a surround frame built to the bases' size.
What sheets fit a split king?
Split-king sheet sets, which include two Twin XL fitted sheets and a King-size flat sheet.
Can Candace & Basil build a split king frame for adjustable bases?
Yes. Share your base model and dimensions and we will build the frame to fit them.
Related reading: Specialty size beds guide · Split California King bed frame · Twin XL bed frame guide
Ready to build yours?
Browse our custom beds, request a custom quote, or call 1-800-961-1789. Visit us at 2334 NE 2nd Ave, Miami, FL 33137 (Mon–Fri 11am–6pm, Sat–Sun 11am–5pm).
