A standard King is wider, and a California King is longer. A King measures 76 by 80 inches; a California King measures 72 by 84 inches. So a King gives you four more inches of width to share, while a Cal King gives four more inches of length for tall sleepers. Neither is simply bigger — they trade width for length. Here is the difference drawn to scale and which one fits your room.
The Numbers Side by Side
| Standard King | California King | |
|---|---|---|
| Width | 76 in | 72 in |
| Length | 80 in | 84 in |
| In centimeters | 193 × 203 | 183 × 213 |
| Best for | Couples wanting shared width | Tall sleepers, narrow/long rooms |
| Comfortable room | 12 × 12 ft | 11 × 12 ft |
Which One Fits Your Room?
Because a Cal King is four inches narrower, it suits a room that is a little tight on width but has length to spare — a long, narrow bedroom. A standard King suits a squarer room where width is available. Both are most comfortable with the headboard on the shorter wall and about 30 inches of walkway on each side; check your exact room with the Bed Size Calculator.
Which One Fits You?
If you or your partner is over about six feet tall, the Cal King’s extra four inches of length keeps your feet on the mattress. If height is not an issue and you want more elbow room side to side, the standard King’s extra width is the better trade. Note that bedding is sized differently for each, so buy King or Cal King sheets specifically.
See every size in the mattress size chart, or the full bed & mattress size guide for headboard and nightstand details.
Frequently Asked Questions
Neither is simply bigger. A standard King is wider (76 by 80 inches) and a California King is longer (72 by 84 inches). The King has slightly more total surface area, but the Cal King gives more length for tall sleepers.
Yes. At 84 inches long, a California King is four inches longer than a standard King, which keeps taller sleepers (over about six feet) from having their feet hang off the end. If you are tall, it is usually the better choice.
No. Because the dimensions differ, King and California King sheets are made in separate sizes. Buy bedding labeled specifically for your mattress, or a fitted sheet made for the wrong one will not fit properly.
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