Four inches changes the shape, not the quality.
King is 76 × 80 inches. California King is 72 × 84 inches: 4 inches narrower and 4 inches longer. Choose the space you will use, then check the actual bed frame and walking room. California King is not the larger mattress by surface area.
+4 inKing width
+4 inCal King length
32 sq inKing area advantage
King vs. California King dimensions
Both sleep two. The useful difference is where each mattress puts four inches.
Both mattress outlines use the same scale. Bedroom photographs below illustrate the products, not exact mattress dimensions.
| Measurement | King | California King |
|---|---|---|
| Inches | 76 × 80 | 72 × 84 |
| Feet and inches | 6 ft 4 in × 6 ft 8 in | 6 ft × 7 ft |
| Centimeters, rounded | 193 × 203 | 183 × 213 |
| Surface area | 6,080 sq in (42.22 sq ft) | 6,048 sq in (42 sq ft) |
| Width per person when divided equally | 38 inches | 36 inches |
These are mattress dimensions, not the outside dimensions of a bed frame. Check the exact model before buying; the Tempur-Pedic size chart is one manufacturer reference. Our complete size guide compares the other standard sizes.
The width difference is 4 inches across the whole bed, or 2 inches per person if two people divide it equally. King has 32 square inches more total area; that small difference is less useful than deciding where you need the space.
Start with how you use the bed
| Your priority | Start by trying | Check before choosing |
|---|---|---|
| More side-to-side room for two people | King | Both sleepers can use the width comfortably. |
| More room at the foot of the bed | California King | The extra length helps in your normal sleeping position. |
| A narrower bed footprint | California King | The longer frame still leaves enough space at the foot. |
| Keeping an existing frame or fitted bedding | The matching size | Read the size label and measure; the two sizes are not interchangeable. |
Height alone does not decide the answer. Pillow placement, whether you curl up or stretch out, and a footboard all affect usable length. Lie in your usual position on both sizes if possible. If you share the bed, compare together rather than treating the nominal width per person as a comfort guarantee.
Two feels. Your choice of size.
The room sets the scene. The mattress makes it yours. Explore these two models in King or California King below—neither feel belongs to just one size.
Tempur-Pedic TEMPUR-ProAdapt® Soft Memory Foam Mattress - 12" ↗
Explore the 12-inch ProAdapt Soft if a softer TEMPUR feel is on your shortlist. Choose the feel first, then compare the width and length of your preferred size.
Bedroom visualization based on the product photo. Check the product page for current photos and specifications. Furnishings not included.
Diamond Lucille Firm Natural Latex Hybrid Euro Top Mattress - 15" ↗
The 15-inch Lucille pairs a firm feel with a substantial Euro Top profile. Include that height when checking your frame, bedside table and fitted-sheet depth.
Bedroom visualization based on the product photo. Check the product page for current photos and specifications. Furnishings not included.Check the frame and the walking space
Foot: 144 − 86 = 58 in
Foot: 144 − 90 = 54 in
There is no single minimum bedroom size that proves a bed will work. Measure the frame’s outside width and length, then account for nightstands, open drawers, closet doors and the route into the room. Tape the proposed frame outline on the floor and walk around it.
| Illustrative setup | King | California King |
|---|---|---|
| Assumed outside frame size | 80 × 86 inches | 76 × 90 inches |
| Space on each side, centered | (144 − 80) ÷ 2 = 32 inches | (144 − 76) ÷ 2 = 34 inches |
| Space at the foot, head against wall | 144 − 86 = 58 inches | 144 − 90 = 54 inches |
The frame sizes above are examples, not measurements of a product we sell. They assume an otherwise empty room, a centered bed and no gap behind the headboard. Furniture, drawers and door swings reduce the usable clearance. These figures are planning calculations, not accessibility or building-code requirements.
In this example, California King adds 2 inches on each side and uses 4 more inches at the foot. Enter your own measurements in the Room Fit Planner, then confirm the furniture layout in the actual room.
Match the bedding and the support system
Buy fitted sheets and a protector labeled for the exact mattress size, with a pocket depth that accommodates its height. King fitted bedding is shaped for a wider, shorter mattress; California King fitted bedding is shaped for a narrower, longer one. A comforter or duvet may have different sizing rules, so compare its actual measurements and the drop you want.
For a concrete example, Helix lists separate King and California King protector dimensions. Check the product you are buying rather than assuming every brand uses the same pocket depth. Browse protectors and sheets by the required size.
A frame must support the mattress’s footprint and meet the mattress manufacturer’s support instructions. Some adjustable frames accept multiple sizes, but only use a configuration the frame manufacturer specifies. Confirm center support, slat spacing and the exact foundation or base size before reusing an existing setup.
Compare the complete price in both sizes
Do not assume California King always costs more, or that both sizes always cost the same. Select King and California King on the same current model, in the same firmness and with the same accessories, to compare the actual offers.
- Mattress: compare the same model, generation, feel and selected size.
- Support: include a matching frame, foundation or adjustable base if needed.
- Bedding: include correctly sized sheets and a protector.
- Service and checkout: check delivery, setup, removal, tax and applicable fees.
Use the total-cost planner to keep the whole purchase together. The mattress budget guide explains how to compare current prices without mistaking a starting price for your chosen size.
Five questions that prevent a sizing mistake
Is California King bigger than King?
It is longer, but narrower. King has slightly more surface area. Use the dimension table to compare the direction in which you need more space.
Will a California King fit a King bed frame?
Do not assume it will. The mattress footprints differ. Check the frame’s approved configurations and mattress support requirements; our foundation collection is a starting point for finding the matching size.
Can I use King sheets on a California King?
Choose fitted sheets and a protector in the matching size. For flat sheets and duvets, check actual measurements and desired overhang. Compare the available sizes in our sheet collection.
Do two Twin XL mattresses make a California King?
No. Two 38 × 80-inch Twin XL mattresses side by side make a 76 × 80-inch Split King. A Split California King uses two 36 × 84-inch halves. See the manufacturer’s split-size explanation and our size chart.
Which size is best for a tall sleeper?
Try the extra length in your normal sleeping position, with a pillow and any footboard taken into account. There is no exact height cutoff that works for everyone. Use the showroom directory to arrange a comparison of displayed options.
Make the choice in three steps
- Choose the dimension you need most: side-to-side width or head-to-foot length.
- Check the outside frame measurements, access and furniture clearances.
- Compare the selected-size price plus matching support and bedding.
If King wins on comfort and room fit, start with King mattresses. If the extra length is more useful, explore California King mattresses. Choose firmness and construction separately from size.
If you are moving up from Queen
Queen is 60 × 80 inches. King adds 16 inches of total width and keeps the same length; California King adds 12 inches of total width and 4 inches of length. Split equally, that is 8 more inches per person for King or 6 for California King, compared with Queen.
The wider bed also uses more floor space. Read the Queen vs. King comparison if you are still deciding whether to change size at all.
Before you place the order
- Record the exact mattress model, firmness and exact size on your shortlist.
- Measure the frame outside dimensions and the mattress support surface.
- Check the delivery route, including doorways, turns, stairs and elevator limits.
- Confirm fitted bedding size, protector depth and base compatibility.
- Review current delivery arrangements and comfort-exchange terms before checkout.
Share access concerns with our team in advance. A room measurement alone does not prove a mattress can reach it. See the delivery guide and Love Your Bed Guarantee for current service and exchange details.
Bring your measurements to a showroom
Bring a simple floor sketch, frame measurements and photos of any tight delivery access. Compare usable width and length first, then try the firmnesses and constructions on your shortlist.
Contact your preferred LA showroom to confirm displayed models and sizes before travelling. Display availability and order availability are different; ask about the exact option you want.
Width or length? Bring the answer to the showroom.
King is 76 × 80 inches. California King is 72 × 84 inches. Confirm the frame footprint, bedding, support and selected-size price before buying.