by A California King mattress is the longest standard mattress available -- 84 inches long and 72 inches wide. It's the right choice for tall sleepers who want to stop hanging off the end of the bed.
California King Dimensions
California King: 72 inches wide x 84 inches long. Compare to standard king (76" x 80") -- cal king trades 4 inches of width for 4 inches of length. Total surface area is nearly identical.
King vs California King: Side by Side
| Feature | King (76" x 80") | California King (72" x 84") |
|---|---|---|
| Width | 76 inches | 72 inches |
| Length | 80 inches | 84 inches |
| Width per person | 38 inches | 36 inches |
| Best for tall sleepers? | Fits up to ~6'4" | Fits up to ~6'8" |
| Bedding availability | Wide selection | Moderate |
| Price difference | -- | +$50-$200 typically |
Best California King Mattresses 2026
The Sweetnight Breeze California King is $749 -- best value at this size. PCM cooling + pocketed coils, 365-night trial.
Budget Pick
Sweetnight Twilight Hybrid — From $329
Medium-firm 6/10, pocket coils, HSA eligible. 100-night trial.
The Amerisleep AS3 California King at $1,799 uses plant-based foam and HIVE zoned support. The extra length is fully supported. 20-year warranty.
Frequently Asked Questions
Is California King bigger than King?
California King is longer (84" vs 80") but narrower (72" vs 76"). Total surface area is nearly identical. Cal king wins on length, standard king wins on width.
Can I use king sheets on a California King?
No. California King (72" x 84") and standard King (76" x 80") require different fitted sheets. Flat sheets and comforters may say king/cal king and fit both, but fitted sheets must match exactly.
How tall do you need to be to need a California King?
A standard king (80" long) fits sleepers up to about 6'4" comfortably. If you're 6'2" or taller and sleep close to the end, a California King's 84" length is worth considering.