King vs California King
Updated October 3, 2026 · By Serge, King Size Bed
A king mattress measures 76 x 80 inches and a California king 72 x 84. The king is 4 inches wider, the California king 4 inches longer, and the king has slightly more sleeping surface. Across 130 bed models sold in both sizes, the California king version cost a median of $13 more.
King vs California king: the numbers side by side
| King | California king | |
|---|---|---|
| Mattress | 76 x 80 in | 72 x 84 in |
| In feet | 6 ft 4 in x 6 ft 8 in | 6 ft x 7 ft |
| In centimeters | 193 x 203 cm | 183 x 213 cm |
| Sleeping surface | 6,080 sq in (42.2 sq ft) | 6,048 sq in (42.0 sq ft) |
| Width per sleeper (2 adults) | 38 in | 36 in |
| Length | 80 in | 84 in |
| Split version | 2 x (38 x 80 in), two twin XL | 2 x (36 x 84 in) |
| Same bed model, frame outside | base | about 4 in longer; same width on 79 of 120 models checked at one US online store |
| Same bed model, median price | base | +$13 (+1.6%) |
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The California king is not the bigger bed. It trades 4 inches of width for 4 inches of length, and it ends up 32 square inches smaller, about half a percent. Each of two sleepers gets 36 inches of width on a California king against 38 on a king, the width of a twin XL.
The industry guideline published by the International Sleep Products Association lists the king at 76 x 79.5 inches and the California king at 72 x 83.5, with half an inch of tolerance either way. Labels round the lengths to 80 and 84.
The frame: what those 4 inches change
Most comparisons stop at the mattress. The frame is what has to fit your room, so we compared the outside dimensions that one US online furniture store lists for the same bed models in both sizes: 120 models with readable figures for the king and the California king version.
| What changes on the frame | Result on 120 models |
|---|---|
| Length, California king vs king | 4 in longer (median; middle half from 4 to 4.25 in) |
| Width the same as the king version (within 1 in) | 79 models (66%) |
| Width 2.5 to 5 in narrower | 34 models (28%) |
| Height | the same on 113 of 120 |
| Weight | heavier on 96 of 120, by a median of 7 lb |
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So the California king mattress is 4 inches narrower, but its frame usually is not. Headboards and side rails are often built to the same width for both sizes, and only the rails get longer. If a narrow room is the reason you are looking at a California king, check the outside width of the exact frame before you order.
Across 545 king frames listed by US online stores, the median outside size was 80 x 86 inches. Add the 4 inches and a typical California king frame comes to about 80 x 90. Measured directly on 118 California king frames from one US online furniture store, the median was 80.5 x 92.25 inches; our California king bed frame dimensions guide has the full figures and a room chart. Our 20 cal king bed frames measure 73.3 to 83.4 inches wide outside.
Room size: the foot of the bed is what changes
Furniture and mattress sites do not agree on room size. We compared the minimum room sizes that eight of them give for these two beds and found six different answers, from 10 x 12 ft to 12 x 14 ft. None explains how it was calculated.
Here is the calculation instead. It uses a median king frame (80 x 86 in) and a California king frame of the same width, 4 inches longer (80 x 90 in). We keep at least 24 inches free on each side and at the foot, our own rule of thumb rather than an official standard, and we put the headboard on the wall that leaves the most room.
| Room | King frame 80 x 86 in | California king frame 80 x 90 in |
|---|---|---|
| 10 x 10 ft | tight: 20 in each side, 34 in at the foot | tight: 20 in each side, 30 in at the foot |
| 10 x 12 ft | fits: 32 in each side, 34 in at the foot | fits: 32 in each side, 30 in at the foot |
| 11 x 12 ft | fits: 32 in each side, 46 in at the foot | fits: 32 in each side, 42 in at the foot |
| 12 x 12 ft | fits: 32 in each side, 58 in at the foot | fits: 32 in each side, 54 in at the foot |
| 9 x 12 ft | tight: 32 in each side, 22 in at the foot | tight: 32 in each side, 18 in at the foot |
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The side space stays the same unless your California king frame is narrower. What you lose is 4 inches at the foot. In a room that is short from the headboard wall to the opposite wall, that is where a California king gets tight first. The room check in our king bed frame dimensions guide does this math with your own room and frame.
Price: does a California king cost more?
Mattress makers disagree. One says California king mattresses usually start at a higher price; another says king mattresses cost more. Both talk about mattresses, not frames. So we compared the price of the same bed in both sizes: 130 bed models sold in king and California king by US online furniture stores, at the prices listed on September 29, 2026.
| Same bed model | Result on 130 models |
|---|---|
| California king more expensive | 77 (59%) |
| Same price | 50 (38%) |
| California king cheaper | 3 (2%) |
| Median difference | +$13.24, or +1.6% of the king price |
| Smallest and largest gap | -$17.57 to +$100 |
| Median price, king vs California king | $605.59 vs $622.06 |
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The California king version costs more more often than not, but the gap is small: about $13 in the middle, and $100 at most in our sample. The gaps cluster on a few round amounts ($0, about $13, $16 and $26 at one store; $50, $70 and $100 at another), which looks like a store price grid rather than the cost of 4 inches of wood. A US furniture distributor's catalog pointed the other way: on 15 bed frames listed in both sizes, the California king list price was a median of $12 lower.
In short, the bed itself is not where the money goes. Sheets differ, because they are cut differently (see below).
Which one should you choose?
Choose a king if you share the bed with a partner, a child or a dog. Each adult gets 38 inches, 2 more than on a California king, and the surface is the larger of the two. It is also the easier size to shop for: one mattress maker lists sheets, duvets, bed frames and adjustable bases as easier to find in king, and a split king is simply two twin XL mattresses.
Choose a California king if you are tall. A king is 80 inches long, 6 ft 8 in. At 6 ft 4 in (76 inches), a king leaves you 4 inches beyond your height and a California king 8. Those inches are the whole point of the size. One mattress maker draws the line at 6 ft 2 in.
Look at your room, not only at yourself. A California king frame of the same width as a king frame does not save space on the sides. It only costs you 4 inches at the foot. It saves width only if you pick a frame that is actually narrower.
Our advice: for most couples, the king is the better bed. Pick the California king when someone in the bed is over about 6 ft 2 in, and check that you can spare the extra 4 inches at the foot.
Comparing the smaller sizes instead? Our full vs queen bed guide runs the same checks one step down, 54 x 75 against 60 x 80 inches.
Do king sheets fit a California king?
No. A fitted sheet made for a king (76 x 80 in) is 4 inches too wide and 4 inches too short for a California king (72 x 84 in), and a California king fitted sheet is too narrow and too long for a king. Flat sheets and duvet covers are another story. We compared the sizes five sheet and mattress brands publish:
| What we compared (5 brands) | King vs California king |
|---|---|
| Fitted sheet | different at all 5 (76 x 80 vs 72 x 84 in) |
| Flat sheet | the same size at 3, different at 2 |
| Duvet cover | the same size at all 5 (the size itself varies by brand) |
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Buy fitted sheets in the exact size of your mattress, and check the label for flat sheets. Pocket depth matters too: the two brands that publish it cut their king and California king fitted sheets 15 and 17 inches deep. For a wider comparison, our king size bedding dimensions guide covers 19 brands: 12 of the 14 that sell duvet covers give the California king the same size as the king.
Want the flat sheet, duvet cover, comforter and pillowcase checked one by one at 4 bedding brands? Our answer to do king sheets fit a California king sets them side by side in one table.
Split California king
A split California king is two mattresses of 36 x 84 inches side by side, 72 x 84 inches together. It is not two twin XL mattresses: those (38 x 80 in each) make a split king. Mattress makers that sell the split California king list each half at 36 x 84 inches, and one foundation maker sells it as two 36 x 84 inch pieces.
It exists for adjustable bases, so that each side can move on its own, and for couples who want two different mattresses. Two cautions. It is harder to find than a split king: one mattress maker offers it on only two of its mattresses. And a single California king fitted sheet does not suit it: one bedding maker warns that standard California king sheets "won't anchor correctly to two independent mattresses". Our split king bed guide covers sheets and frames for both split sizes.
Bigger than a California king
The California king is the longest bed widely sold in the US, but not the largest. A few makers sell bigger sizes, which need specialty frames and custom bedding:
| Size | Mattress | Compared with a California king |
|---|---|---|
| Texas king | 80 x 98 in | 8 in wider, 14 in longer |
| Wyoming king | 84 x 84 in | 12 in wider, the same length |
| Alaskan king | 108 x 108 in | 36 in wider, 24 in longer |
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These are not standard sizes, so frames, sheets and mattresses are specialty items.
Questions people ask
Is a California king bigger than a king?
No. It is 4 inches longer but 4 inches narrower, and its surface is about half a percent smaller: 6,048 square inches against 6,080.
Which is better, king or California king?
For two adults, the king: 2 more inches each and more choice in frames and sheets. For a sleeper over about 6 ft 2 in, the California king: 4 more inches of length.
Can you put a California king mattress on a king frame?
No. The mattress is 4 inches too long for the frame and leaves a 2 inch gap on each side. A mattress maker puts it plainly: "Using the wrong bed frame could damage your mattress." Buy the frame in the size of the mattress.
How big is a California king in feet?
6 feet wide and 7 feet long (72 x 84 inches). A king is 6 ft 4 in by 6 ft 8 in.
What is an Eastern king?
The standard king, 76 x 80 inches. The name only exists to tell it apart from the California king, sometimes called the Western king.
Does a California king foundation come in one piece?
Often not. One maker ships its king, split king, California king and split California king foundations in two pieces "in order to more easily maneuver through hallways, stairwells". Another maker also lists its king and California king foundations in two pieces.
How big is an Alaskan king?
108 x 108 inches, a 9 foot square. It is not a standard size, so mattresses, frames and sheets are hard to find.
How big is a Texas king bed?
80 x 98 inches: 8 inches wider and 14 inches longer than a California king.
Settled on a standard king? Every one of our king bed frames with headboard lists its outside size, so you can check it against your room before you order. Comparing with a smaller bed instead? See our king vs queen guide, or our bed sizes chart for every US size.
Shop king beds by style
Every bed in these collections lists its outside size on the product page, so you can check it against your room and your mattress before you order.
- All king bed frames
- By build: king platform beds, upholstered king beds, wood king bed frames, king beds with storage and king beds with drawers
- By height: low profile king beds, king floor beds with no gap underneath, king bed frames high off the ground with 10 to 14 inches underneath, and king beds with a tall headboard
- By look: modern, mid-century, rustic, cloud beds, velvet, black, brown, beige, gray, white and cream, wingback, boucle, linen, faux leather, solid wood, canopy, sleigh, rattan, metal, tufted, farmhouse and panel king beds, and king beds with a bookcase headboard
- For a 72 x 84 inch mattress: California king bed frames, including California king platform beds that need no box spring
- A few of our king beds: Burbank cloud bed with side shelves, Biloxi canopy bed, Montauk storage bed with 8 drawers and Fresno wood platform bed
Sources: prices of 130 bed models sold in both king and California king by US online furniture stores, listed on September 29, 2026; listed outside dimensions of 120 of those models in both sizes and of 545 king frames, read on September 29, 2026; list prices of 15 frames in a US furniture distributor's catalog, read on September 30, 2026; sheet, foundation and mattress sizes published by the brands, read on October 3, 2026; the dimensional guideline of the International Sleep Products Association.
Whichever you choose, the rug follows the frame: see what size rug goes under a king bed.
If the California king is your size, start with the Davis mid-century wood California king bed, the Santa Barbara beige California king upholstered bed or the Tiburon gray chevron headboard California king bed.
Prefer real wood? The Sonoma solid wood California king bed frame has a rubberwood frame and legs.
For how high the mattress will sit once it is on the frame, see our guide to standard bed height.
Settled on a California king with a soft headboard? Compare our California king upholstered bed frames, from tall wingbacks to low rounded beds.
Related reading: our California King Bed Cost guide.
Need the king next to the queen, full and twin as well? Our king size bed dimensions chart lines up all six US sizes, mattress and frame.
For the full budget of the standard size, read how much does a king bed cost: median frame and mattress prices from US online stores, side by side.
Outside the US the king is a different bed: in France it is 180 x 200 cm (70.9 x 78.7 in), narrower than both American kings. Compare the European king bed with both in our size chart.