King and California King mattresses look similar on paper — both are large, both work well for couples, and the price difference is usually minimal. But choosing the wrong one means either your feet hang off the edge or your bedroom feels cramped.
Here's the real difference: a King is wider, a Cal King is longer. That single distinction should drive most buying decisions.
| Feature | King | California King |
|---|---|---|
| Width | 76 inches | 72 inches |
| Length | 80 inches | 84 inches |
| Total Surface Area | 6,080 sq in | 6,048 sq in |
| Difference | 4" wider | 4" longer |
The total surface area is nearly identical — King is slightly larger overall. But the shape difference changes how the mattress functions in your room and for your body.
The King mattress is the right choice for most couples. The extra width — 76 inches versus 72 — gives each person 38 inches of their own space, which is equivalent to a twin mattress worth of room per person.
King is the better choice if:
King works best in: Square master bedrooms, at least 12 × 12 feet. For comfortable movement, aim for 13 × 13 or larger.
The California King exists primarily for tall sleepers. At 84 inches long, it gives a 6'6" person a full 2 inches of clearance — compared to only 2 inches on a King (80") for someone 6'4". If you've ever woken up with your feet hanging off the edge of a mattress, a Cal King solves that permanently.
Cal King is the better choice if:
Cal King works best in: Rectangular rooms at least 12 × 14 feet. The narrower width (72") actually works well in rooms that aren't wide enough to comfortably accommodate a King.
| Room Type | Better Choice | Why |
|---|---|---|
| Square bedroom (12×12 or 13×13) | King | Uses width without feeling cramped lengthwise |
| Rectangular bedroom (12×14+) | Cal King | Fits better in longer, narrower rooms |
| Large open master (14×16+) | Either | Both work; personal preference applies |
| Under 12 feet wide | Neither (consider Queen) | Both kings need at least 2 feet of clearance on each side |
Design rule of thumb: leave at least 2 feet of walking space on at least two sides of the bed, and 3 feet in front of any dresser or closet.
This is a practical consideration that most buyers overlook. King mattress accessories are significantly more available than Cal King. You'll find far more sheet sets, comforters, duvet covers, and bed frames in King size at mainstream retailers.
California King bedding exists, but your selection is smaller — and in some stores, specialty only. If you frequently redecorate or like rotating between sheet sets, this matters.
Bed frames: King and Cal King frames are not interchangeable. The different dimensions require different frame sizes. If you're upgrading from a King to a Cal King (or vice versa), you'll need a new frame.
At LA Mattress Store, we carry accessories for both sizes. For frames, see our bed frame collection.
The mattresses themselves are priced similarly — manufacturers don't charge a significant premium for one shape over the other. A $1,200 King and a $1,200 California King from the same brand are essentially the same cost to produce.
Where cost differences appear:
Answer these three questions:
If you answered no to all three, a King is probably the better default choice — it has more surface area, easier bedding access, and fits more bedroom configurations.
Still unsure? Visit any of our 5 LA showrooms and lie on both. The feel of the size difference in person often makes the decision obvious.
Not overall — they have nearly the same surface area. The King is wider (76" vs 72") and the Cal King is longer (84" vs 80"). They're different shapes, not different sizes.
King is generally better for couples because the extra width gives both sleepers more horizontal space. Cal King is better if one or both partners are unusually tall.
No. King sheets are too short in length and too wide in width for a Cal King. They'll pull off at the corners or bunch awkwardly. Always buy Cal King-specific sheets.
Neither size inherently helps or hurts back pain — that comes down to the mattress material and firmness, not the size. Browse our full mattress collection and filter by support type.
No. You need a frame and adjustable base specifically sized for whichever mattress you choose. See our adjustable bed options for both King and Cal King.
King is significantly more popular nationwide. Most master bedrooms are better suited to the King's wider proportions, and the wider availability of King accessories makes it the easier choice.
At any of our 5 LA Mattress Store locations. We carry both King and California King mattresses across multiple brands and firmness levels so you can test and compare in person.
Browse our selection of king mattresses and California king mattresses at LA Mattress Store. Free delivery, white glove setup, and a 120-night comfort guarantee on every purchase.
The short version: a standard king is 4 inches wider but 4 inches shorter than a California king. Surface area is virtually identical. Here's a full quick reference:
| Measurement | Standard King (Eastern King) | California King (Western King) |
|---|---|---|
| Width (inches) | 76" | 72" |
| Length (inches) | 80" | 84" |
| Width in feet | 6'4" | 6'0" |
| Length in feet | 6'8" | 7'0" |
| Width in cm | 193 cm | 183 cm |
| Length in cm | 203 cm | 213 cm |
| Surface area | 6,080 sq in | 6,048 sq in |
| Best for sleepers up to | ~6'4" tall | ~6'10" tall |
| Best room shape | Square (12'×12' minimum) | Rectangular / long-narrow (12'×14' minimum) |
Is a California king longer or wider than a king? Longer. Cal king is 84 inches long; standard king is 80 inches long. Cal king is also 4 inches narrower than a standard king.
California king dimensions in cm: 183 × 213 cm. Standard king is 193 × 203 cm.
California king dimensions in feet: 6 feet wide by 7 feet long.
Which king is bigger overall? Standard king — by 32 square inches, which is negligible. The shape difference matters far more than the total area difference.
What's the simplest rule? If you're 6'2" or taller, get California king for the extra length. If you're shorter and have a square room, get standard king for the extra width.
For the full size lineup including queen, full, and twin, see our mattress sizes overview. Shop king mattresses · California king mattresses · adjustable bases compatible with both.
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