Your Guide to The Difference Between a California King vs. King Size Bed
A California King is 4 inches longer and 4 inches narrower than a standard King. That small swap changes how the bed fits your space and your sleep, so it’s worth getting right before you shop.
What is a California King bed?
A California King (Cal King for short) measures 72 inches wide by 84 inches long. A standard King sits at 76 inches wide by 80 inches long. Same family, different proportions: the Cal King is the tall, slim one, and the King is the wide, roomy one.
The Cal King has a loyal following in the US, especially with taller sleepers who want room to stretch out without feet hanging off the end. It's also a smart pick for long, narrow bedrooms where a wider bed would crowd the walkways. If you've ever wondered why one bed has two names and two sizes, that's the short version.
Sizes can vary slightly between mattress brands, so always check the tag or measure your own mattress before you buy bedding.
California King vs King: what's the difference?
It comes down to shape. The King is wider and shorter, the California King is narrower and longer, and the total sleeping space is almost identical.
Size and dimensions comparison
King
California King
Width
76 in
72 in
Length
80 in
84 in
Sleeping surface
6,080 sq in
6,048 sq in
Best for
Couples who like space to spread out, wider bedrooms
Tall sleepers, long and narrow bedrooms
Typical mattress sizes shown. Exact measurements can vary a little by brand.
So which is bigger? Neither, really. The King wins by a whisker on surface area, and the Cal King wins on length. Pick based on what matters most to you: elbow room or legroom.
Which bedrooms and bed frames suit each size
Start with your space. A King needs more width, so it suits a squarer bedroom where you can walk around both sides comfortably. A Cal King needs more length, so it's a great fit for a long, narrow space where width is the tight spot.
As a rule of thumb, leave around two feet of walking space on the sides and foot of the bed so the space still feels easy to move through.
Frames matter too. A King frame and a Cal King frame are built for different mattress dimensions, so you can't swap one for the other. Check the mattress size your frame is made for, and if you're buying a new frame, confirm the size before you order. Headboards and bed skirts follow the same rule.
Does the sheet size actually matter?
For fitted sheets, yes. A King fitted sheet is made for a 76 by 80 inch mattress and a Cal King for a 72 by 84 inch mattress, so the wrong one will pull, slip or leave a corner bare. Fitted sheets (and bed skirts) are the one piece you can't mix and match.
The good news is that the rest is easier. Flat sheets, pillowcases and duvet covers are usually interchangeable between the two sizes. Our King duvet covers are generously sized to fit both standard King and California King beds, so one cover works either way.
Our Cal King fitted sheets are cut to 72 by 84 inches, with a 20 inch depth to fit thicker mattresses too, and a wide elastic edge keeps the corners snug. They come in Eden Cotton, Eve Linen and Kane Bamboo, so you can choose the feel you like best. Browse all Cal King bed sheets in one spot.
Tip: measure your mattress depth before you buy. If you've added a topper, include that in your measurement.
Bedding sizes at a glance
Here’s how the rest of your bedding lines up, so you know what to buy once and what to buy for your exact bed.
King
Cal King
Fitted Sheet
78 x 80 in, 20 in deep
72 x 84 in, 20 in deep
Flat Sheet
108 x 102 in
108 x 102 in
Duvet Cover
106 x 95 in
106 x 95 in
Standard Pillowcase
19 x 29 in
19 x 29 in
King Pillowcase
20 x 36 in
20 x 36 in
Euro Pillowcase
26 x 26 in
26 x 26 in
Width x length. Fitted sheet depth is the pocket depth.
Fitted sheet is not interchangeable between bed sizes. All other bedding components are interchangeable.
Which one should you choose?
There's no wrong answer, just a better fit for you. Run through these three questions:
- How tall are you (and your partner)? If anyone is around 6 feet or taller, the extra 4 inches of length on a Cal King can make a real difference to comfort.
- How wide is your bedroom? A King needs more width on both sides. If your space is long and narrow, a Cal King keeps walkways clear.
- What's your mattress situation? Cal King mattresses are less common in stores and often cost a little more, while King mattresses are easier to find. Bedding prices are usually the same for both.
Still stuck? Choose the King if you love sprawling sideways and the Cal King if you love stretching out lengthwise. Either way, finish the look with layers that suit your bed: a duvet cover that fits both sizes, a fitted sheet cut for your mattress and a couple of pillows to make it feel like yours.
Shop California King and King size bedding at Sheet Society
Know your size? Great. Our bedding is made for the way you sleep, with fitted sheets cut for your mattress and duvet covers that fit both King and Cal King beds. Shop online and find the feel you love, from cotton to linen to bamboo.
California King vs King FAQs
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