2 × 38″ × 80″ · Two Twin XL mattresses for independent adjustable bases
Split King Mattresses on Sale
A Split King is two Twin XL mattresses placed side by side. Together they measure 76 by 80 inches, the same footprint as a standard King, but each half can sit on its own adjustable base and have its own firmness.
It is the practical choice for couples who want to raise their head or feet independently, or who want different feels on each side. Stock in this setup varies, so the listings below may be Twin XL pairs or individual halves.
- Dimensions
- 2 × 38″ × 80″
- Room size
- About 12 × 12 ft or larger
- In stock now
- 0 listings
Split King mattresses in stock
Filter and sort in the shop →No Split King mattresses in stock right now.
Inventory turns over often. Leave your number and we will text you when one arrives.
Why couples choose a Split King
With two separate mattresses, one person can sit up to read while the other sleeps flat, and motion on one side is isolated from the other. You can also pick different firmness levels for each half, as long as the two surfaces are compatible.
The seam in the middle is the usual trade-off. A good mattress topper that spans both halves smooths it out.
Buying a Split King
Order two matching Twin XL mattresses, or confirm that a listing includes both halves. Use two Twin XL fitted sheets, or sheets sold specifically as Split King.
Also check the adjustable bases. Bases for this setup are sold as a pair of Twin XL units, and the mattress must be compatible with flexing bases.
Frequently asked questions
What size is a Split King?
A Split King is two Twin XL mattresses, each 38 inches wide and 80 inches long, for a combined 76 by 80 inches, the same as a standard King.
Do I need adjustable bases for a Split King?
No, but the setup is mainly designed for them. Each half sits on its own base so you can adjust sides independently. A regular frame can also hold two Twin XLs.
Are Split King sheets different from King sheets?
Yes. You need two Twin XL fitted sheets or sheets labeled Split King. Standard King fitted sheets will not fit two separate mattresses well.
Can the two halves have different firmness?
Yes. That is one of the main advantages. Keep both halves the same thickness so the top surfaces line up.
Compare other sizes
Helpful guides
- Mattress Size Guide: Dimensions, Room Sizes and How to ChoosePicking the wrong size is the most expensive mattress mistake. Here are the real dimensions, room requirements and who each size suits.
- Hybrid vs Memory Foam Mattress: Which Is Right for You?The biggest decision after size is the construction. Here is how hybrid and memory foam mattresses actually differ, and who each suits.