Mattress Sizes & Dimensions: Twin Through California King
Use this U.S. mattress-size chart to compare Twin, Twin XL, Full, Queen, King and California King dimensions, plan a bedroom, choose sheets and foundations, and understand split-king sizing.
Quick answer: A standard U.S. Queen is about 60 × 80 inches, a King is about 76 × 80 inches, a California King is about 72 × 84 inches, and a Twin XL is about 38 × 80 inches. Finished mattress dimensions can vary slightly by brand and construction, so check the exact product before ordering a tight-fitting frame or bedding.
Standard U.S. Mattress Size Chart
| Mattress size | Approx. inches | Approx. centimeters | Common planning use |
|---|---|---|---|
| Twin | 38 × 75 in. | 97 × 191 cm | Children, bunks, compact guest rooms and single sleepers |
| Twin XL | 38 × 80 in. | 97 × 203 cm | Taller single sleepers and split-king systems |
| Full / Double | 54 × 75 in. | 137 × 191 cm | Single sleepers wanting more width and smaller guest rooms |
| Queen | 60 × 80 in. | 152 × 203 cm | Couples, primary bedrooms and single sleepers wanting extra room |
| King | 76 × 80 in. | 193 × 203 cm | Couples who prioritize maximum width |
| California King | 72 × 84 in. | 183 × 213 cm | Taller sleepers and rooms where extra length matters more than maximum width |
Nominal vs. finished size: the dimensions above are common U.S. reference sizes. Individual mattresses can vary slightly because of quilting, natural materials, edge construction and manufacturing tolerances.
What Size Mattress Is 60 × 80?
A 60 × 80-inch mattress is the standard nominal size of a Queen mattress in the U.S. If an existing mattress measures around 59–60 inches wide and roughly 79–80 inches long, it is most likely a Queen. Small finished-size variations are normal.
What Size Mattress Is 76 × 80?
A 76 × 80-inch mattress is the standard nominal size of a King. A King gives couples more width than a Queen while keeping the same nominal 80-inch length.
What Size Mattress Is 72 × 84?
A 72 × 84-inch mattress is a California King. California King is four inches narrower and four inches longer than a standard King, so it favors extra length over maximum width.
What Size Mattress Is 38 × 80?
A 38 × 80-inch mattress is a Twin XL. Twin XL has approximately the same width as a Twin but adds about five inches of length. Two Twin XL mattresses placed side by side form the typical split-king footprint.
Queen vs. King: Which Size Should You Choose?
Choose Queen first if…
- You want more walking space around the bed.
- Your bedroom has tighter furniture clearances.
- You want a common couples size without moving to the widest standard bed.
Choose King first if…
- Two sleepers want more personal width.
- Your room comfortably fits the larger frame footprint.
- You may want a split-king adjustable setup.
Do not choose from mattress dimensions alone. Measure the full bed frame, nightstands, door swing, dresser drawers and walking path. Frames can be wider and longer than the mattress itself.
King vs. California King
King is wider; California King is longer. King is approximately 76 × 80 inches. California King is approximately 72 × 84 inches. Choose based on usable room shape and whether width or extra length matters more.
What Is a Split King Mattress?
A split King usually uses two Twin XL mattresses side by side. Each Twin XL is approximately 38 × 80 inches, creating an overall footprint close to a standard King. This configuration is common with dual adjustable bases because each side can move independently.
If two sleepers want different mattress feels, a split King can also allow different Twin XL comfort choices, but the two mattresses should have compatible heights and the entire setup should be checked for base and frame compatibility.
Mattress Height vs. Mattress Size
Width and length determine the nominal mattress size; height is a separate measurement. Mattress height matters for fitted-sheet pocket depth, total bed height, headboard appearance and adjustable-base setup. A Queen can be 10 inches tall or 16+ inches tall and still be a Queen.
For more help planning the finished height, see the bed-height guide.
How to Measure Before Buying a Mattress
- Measure the usable floor area where the full bed frame will sit.
- Measure doors, hallways, stair turns and elevator openings on the delivery path.
- Check the inside dimensions of an existing frame or platform.
- Confirm the foundation or adjustable base uses the same nominal size as the mattress.
- Check mattress height before buying fitted sheets or protectors.
- Verify the exact finished dimensions on the product page when frame clearance is tight.
What If Your Mattress Measures 52 × 72, 54 × 80 or Another Nonstandard Size?
Those measurements do not match the six most common standard U.S. mattress sizes exactly. They may indicate a specialty mattress, RV mattress, antique frame, custom mattress or simply a measuring difference. Measure width and length at the widest points and check the bed or manufacturer label before ordering a replacement.
For example, a standard Full is nominally about 54 × 75 inches; a standard Queen is about 60 × 80. A mattress around 54 × 80 is therefore longer than a typical Full but narrower than a Queen and should not automatically be treated as either size.
Mattress Size FAQs
Are all Queen mattresses exactly 60 × 80 inches?
No. 60 × 80 inches is the common nominal U.S. Queen size, but finished measurements can vary slightly by manufacturer and construction.
Is a King the same length as a Queen?
Yes, nominally both are about 80 inches long. A King is wider: approximately 76 inches versus about 60 inches for a Queen.
Is California King bigger than King?
It is longer but narrower. California King is about 72 × 84 inches, while standard King is about 76 × 80 inches. Neither is simply larger in every direction.
Is Twin XL half of a King?
Two Twin XL mattresses together create the typical split-king footprint. Because finished dimensions can vary slightly, confirm the specific mattresses and base before ordering.
Can I use a Queen mattress on a Full frame?
No. A Queen is substantially wider and longer than a standard Full, so the frame and mattress dimensions do not match.
Do adjustable bases use the same mattress sizes?
They generally use standard nominal sizes, but split configurations are common. Confirm that the mattress and base are compatible and match the exact size configuration before purchase.
How much space should I leave around a bed?
There is no single room-layout rule that works for every bedroom. Measure walking paths, furniture, doors and drawers and choose a size that leaves the room functional for your needs.
Know the Size? Now Narrow the Feel.
Use the Mattress Finder to compare firmness, construction, cooling and couples preferences, or browse the current mattress catalog by brand and model.