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10px);text-align:center;padding:10px 8px}} A king and a California king both count as the biggest mattress sizes you can buy for a home, and the names make them sound almost identical. They aren't. The short answer: a standard king is wider, while a California king (often called a Cal king) is longer and narrower. That four-inch swap in each direction changes how the bed feels, how it fits in your room, and which sheets you can buy. This guide breaks down the exact dimensions, the practical differences, and how to decide which size is right for you. King vs. California King at a Glance A king is 4 inches wider, and a California king is 4 inches longer. This table puts the two sizes side by side so you can see exactly where they differ. Feature King California King Dimensions (inches) 76 x 80 72 x 84 Dimensions (cm) 193 x 203 183 x 213 Width 4" wider 4" narrower Length 4" shorter 4" longer Surface Area 6,080 sq. in. 6,048 sq. in. Width Per Person 38 in. 36 in. Best for Couples, co-sleepers, families Tall sleepers, long and narrow rooms Minimum Room Size 12 x 12 feet 11 x 13 feet The total sleeping surface is nearly the same. What differs is how that space is distributed: a king gives you width, a Cal king gives you length. What Is a Standard King Size Bed? A standard King bed , often referred to as an "Eastern King," measures 76 inches wide by 80 inches long (about 193 x 203 cm). It is the most common large mattress size and the default choice for many couples who want extra room. The width is the main selling point. Each partner gets roughly 38 inches of space, the same as a twin XL mattress each. That makes a king a good fit for restless sleepers, couples who like personal space, and households where kids or pets regularly climb in. Pros More width for two sleepers Widely available mattresses, frames, and bedding Fits well in most master bedrooms Cons At 80 inches long, taller sleepers may find their feet reaching the end Requires a bedroom of at least 12 x 12 feet What Is a California King Size Bed? A California king bed measures 72 inches wide by 84 inches long (about 183 x 213 cm). It is also called a Western king, a nod to its strong association with California and the West Coast. It is narrower than a standard king but gives you 4 extra inches of length. That extra length makes it popular with taller people. If you are over 6 feet, those added inches can be the difference between sleeping stretched out and sleeping slightly curled. Pros More legroom for tall sleepers Suits long, narrow bedrooms better than a wide king Each sleeper still gets about 36 inches of width Cons Narrower, so it can feel tighter for two people who like to spread out Sheets and bedding can be harder to find, depending on where you shop Key Differences Between King and California King The two sizes differ in five practical ways: width, length, room fit, bedding, and price. Here is how each one affects your choice. Width and sleeping space per person The king wins on width. With 76 inches across, each person has about 38 inches. On a Cal king, that drops to about 36 inches. Two inches per person sounds small, but it is noticeable for sleepers who toss and turn, or when a child or pet joins. Length and legroom The Cal king wins on length at 84 inches versus 80. If you or your partner are taller than about 6 feet, the extra 4 inches helps keep your feet from hanging off the edge or pressing against the footboard. Room size and layout fit The two sizes take up nearly the same floor area, but the shape differs. A king is wider and shorter, so it works well in rooms with a generous wall width. A Cal king is narrower and longer, so it can work better in a long, slim room where side space is tight. Bedding and sheet availability King and Cal king sheets are not interchangeable. A king fitted sheet will not fit a Cal king mattress properly, and the same goes the other way around. A king flat sheet or comforter will usually work on either bed, but fitted sheets must match the size. King bedding is carried almost everywhere, while Cal king options can be more limited, so check availability before you buy. Price and availability Mattress prices for the two sizes are generally very close, and many brands price them the same. The bigger difference often shows up in accessories. Frames, toppers, protectors, and sheets are usually easier to find and more varied in standard king. Is a King or Cal King Bed Right for You? What to Consider The right size depends on four things: how tall you are, how much room you have, how you sleep, and what bedding and budget you're working with. Use the points below, or our mattress buying guide , to narrow it down. Your height and sleeping space Height is the simplest place to start, since the two sizes trade width for length. Choose a king if you want maximum width for a couple, or if kids and pets often share the bed. Choose a California king if you are over 6 feet tall or simply want more legroom. If you and your partner have different heights, the taller person's needs usually decide it: a Cal king keeps them comfortable, while a king helps if the shorter partner values width. Your room size and layout Both sizes need a sizeable room. A king needs a room of at least 12 x 12 feet, and a California king needs at least 11 x 13 feet. Allow more if you want a dresser and nightstands without crowding. Leave at least 2 feet of walkway on each side and at the foot of the bed where you can. Choose a king for wider rooms and a Cal king for longer, narrower ones. Check where the door swings, and where windows, closets, and radiators sit, so nothing is blocked. Measure doorways, hallways, and stairwells before delivery so the mattress can actually get into the room. Your sleeping habits and preferences How you move at night matters as much as how tall you are, so think about your own habits and your partner's. Restless or sprawling sleepers get more room to move on a king, where each person has about 38 inches. Co-sleepers with kids or pets usually find a king more comfortable. Sleepers who stretch out or have long legs benefit from the extra 4 inches of length on a Cal king. Couples who like personal space should weigh width against length: a king gives each person 2 more inches of width, a Cal king 4 more inches of length. Your bedding and budget Once size and sleep style are settled, practical details like bedding and cost can make the final call. Confirm you can easily buy fitted sheets, protectors, and mattress toppers in your size. Compare mattress, frame, and accessory prices together, since the total cost matters more than the mattress alone. If you often replace bedding, standard king usually offers more choice. Quick decision checklist If you're still undecided, this short checklist pulls the points above together. King or California King? If you share the bed and value width, choose a king. If you are tall, choose a California king. If your room is long and narrow, choose a California king. If you want the widest range of bedding, choose a king. Frequently Asked Questions Is a California King bigger than a King? Not in total surface area. A California king is longer (84 inches versus 80), but a standard king is wider (76 inches versus 72). Their surface areas are nearly identical, with the king slightly larger. Can I use king sheets on a California king bed? No, not for fitted sheets. The dimensions are different, so a king fitted sheet will not fit a Cal king mattress correctly. Flat sheets and some comforters may work on both, but check the product dimensions. Which is better for couples: King or California King? The King size is the most favored by couples and those who enjoy stretching out or sharing their bed with pets or children. A California King is better when one or both partners are especially tall. Which is better for tall people? A California king, because it is four inches longer than a standard king. If you are over 6 feet tall, the extra length can make a real difference in comfort. Can a King mattress fit on a California King bed frame? No. A standard King mattress should not be placed on a California King frame because their dimensions are different. The mattress and supporting frame or foundation should be designed for the same size. Is a California King more expensive than a King? Sometimes. Cal King mattresses are often priced slightly higher than a King, by about $200, though some brands price California King and King mattresses the same. Bedding and sheets for California King mattresses may also have fewer options on the market. Find Your King or California King Mattress Free shipping and a 365-night home trial on every mattress. Shop King Mattresses Shop California King Mattresses