Choosing the right mattress size isn't just about fitting a bed into your room—it's about maximizing sleep quality, comfort, and even the way your space feels.
The debate around Cal King vs. King mattresses is a big one for anyone wanting to upgrade their sleeping situation. They’re both large, luxurious choices, but they serve different needs.
This guide breaks down the king vs. Cal king dimensions, who each one is best for, and how to make the right choice for your space and sleep style. Whether you’re designing a new master suite or just wondering, “What size mattress should I get?” we’ve got you covered.
➜ Learn More: King Size Pillow Top Mattress vs. Euro Top: Which Offers Better Support?
Cal King vs. King: What’s the Real Difference?
Here’s the deal: both king and California king mattresses are designed for spacious comfort, but their dimensions vary.
So, what exactly are the dimensions of a California king vs. king? A king mattress typically measures 76" wide by 80" long (193 cm x 203 cm), making it the widest standard mattress size available. A California King, or Cal King, measures 72" wide by 84" long (183 cm x 213 cm), making it longer but narrower.
One of the biggest misconceptions is that a Cal King vs. King bed means, "Cal King is just a bigger King." Not true. While the Cal King is longer (great for tall sleepers), it actually gives up four inches in width compared to a regular King. That can make a big difference depending on how you sleep and how much personal space you want.
Who Should Choose a Cal King Mattress?
If you or your partner is over 6 feet tall, a California King vs. King dimensions comparison makes the Cal King an easy winner. The extra length means your feet won’t hang off the edge, making it the best mattress size for tall people.
It's also a smart choice if you have a narrower but longer bedroom where width is limited, but length is not. Couples with pets who sleep at the foot of the bed often prefer Cal Kings too—the added space means fewer midnight paw-in-the-face wake-up calls.
From a design perspective, king vs. California king for tall people usually tips toward the Cal King for that clean, streamlined look in long rooms. If you're designing a modern bedroom or optimizing for taller furniture and layout, the Cal King could give you better flow and fit.
➜ Learn More: Split King Mattresses: Pros & Cons
Why a King Mattress Might Be a Better Fit
While the Cal King has its perks, the King mattress reigns supreme when it comes to width. If you and your partner like to spread out or have kids (or pets) who regularly join you in bed, the standard king offers more horizontal space to stretch.
It’s also ideal for wider bedrooms, allowing the mattress to feel like a perfect centerpiece without overwhelming the space.
Another plus? Accessories are easier to find. From bed frames to sheet sets and comforters, the king size is more common in stores and online. If you value convenience and versatility, the king size often wins in the mattress size comparison game.
How to Choose Based on Bedroom Size
Before falling in love with either option, break out the measuring tape. For a king mattress, your bedroom should ideally be at least 12 feet by 12 feet, allowing room for nightstands, walking space, and any surrounding furniture. A Cal King works best in rooms that are long and narrow, like 12x14 or larger.
Take into account window and door placement, as well as the flow of the room. The last thing you want is a mattress that blocks natural light or prevents closet doors from opening fully.
When in doubt, sketch your layout or use a digital room planner to test fit each mattress type before you buy.
➜ Learn More: Your Guide to the Best King-Size Mattresses in South Florida
California King vs King: Key Differences to Know Before You Buy
| Size | Dimensions | Best For | Pros | Cons |
|---|---|---|---|---|
| Twin | 38" x 75" | Kids, solo sleepers | Compact, affordable, easy to move | Too small for most adults |
| Full | 54" x 75" | Teens, single adults | Wider than twin, fits smaller rooms | Too small for most couples |
| Queen | 60" x 80" | Couples, guest rooms | Great for two; widely available size | Can feel tight for larger couples |
| King | 76" x 80" | Couples with kids or pets | Widest standard size, roomy and comfortable | Takes up more space; needs a large room |
| California King | 72" x 84" | Tall sleepers, long/narrow rooms | Longest standard size, modern appeal | Slightly narrower than king; harder to find bedding |
➜ Learn More: 9 Best King Mattresses on Florida's Fun Coast
Top Mattress Picks for King Size
Looking to upgrade your sleep? Our top king-size mattress picks offer the perfect blend of comfort, support, and space—so you can stretch out and sleep soundly night after night.
Sealy Posturepedic Elite Albany II Hybrid 13" Medium Tight Top King Mattress
Shop Sealy Hybrid 13" Medium King Mattress
This Sealy hybrid king mattress offers the best of both worlds: firm support with pressure-relieving foam.
It provides a medium-firm feel that's ideal for back and stomach sleepers. Cooling gel memory foam and edge support ensure comfort from corner to corner.
Priced in the mid-range, it includes a solid warranty and quality construction that holds up night after night.
Top Features
- Responsive innerspring + memory foam combo
- Cooling cover for hot sleepers
- Excellent edge support
Stearns & Foster Estate Wrapped Coil Ultra Firm Tight Top King Mattress
Shop Stearns & Foster Wrapped Coil Ultra Firm King Mattress
For those who love a truly firm sleep surface, this ultra-firm King mattress from Sealy is built like a dream.
It features wrapped coils for motion isolation and a dense, tight-top surface that offers unbeatable spinal support. It’s a great fit for king beds where minimal sink and maximum stability are a priority.
Top Features
- Ultra-firm comfort for support lovers
- The durable coil system minimizes movement
- Luxury construction and finish
Tempur-Pedic TEMPUR-Luxebreeze 13" TEMPUR-Material Firm Tight Top Mattress
Shop Tempur-Pedic 13" Memory Foam Firm King Mattress
A standout in cooling performance, this Tempur-Pedic King mattress is designed to keep hot sleepers comfortable all night.
The firm TEMPUR material conforms to your body without overheating, and the 13" profile feels substantial yet supportive.
A luxury option with a higher price tag, it's perfect for those who want cutting-edge tech in a King-sized mattress.
- Advanced cooling tech keeps you 8° cooler
- Conforms to pressure points without sagging
- 10-year limited warranty + 90-night trial
Our Favorite California King Mattresses
Need extra legroom? These top California king mattresses combine extended length with premium comfort, making them ideal for taller sleepers or those who love to spread out in style.
Stearns & Foster Estate Wrapped Coil Ultra Firm Tight Top Mattress
Shop Stearns & Foster Coil Ultra Firm California King Mattress
This model delivers ultra-firm support in a Cal King and King bed format, giving tall sleepers the extra room they need without sacrificing structure.
It has motion-reducing coils and premium materials that feel excellent night after night. This model is ideal for couples who prefer firm beds and require additional length.
Top Features
- Best firmness level for posture
- Excellent build for long-term use
- Low motion transfer
Beautyrest Black Series 2 Hybrid 13.5" Firm Smooth Top Mattress
Shop Beautyrest Black Hybrid 13.5" Firm California King Mattress
If you want firm comfort with high-end materials, this California King Beautyrest mattress has you covered.
It combines memory foam with T3 Pocketed Coils for excellent motion control and breathability. Its sleek profile and balanced support make it a go-to for modern bedrooms with a longer layout.
Top Features
- Firm yet responsive support
- Cooling gel for temperature regulation
- High-end finish and detailing
Final Thoughts: Cal King vs. King—Which One Wins?
So, which is bigger, Cal king or king? Technically, the king is wider, but the Cal king is longer.
Each has its strengths: Cal king for tall sleepers and narrow rooms, king for couples, kids, or anyone who prioritizes extra width. Your final decision should come down to your height, bedroom shape, and how you like to sleep.
No matter which mattress size you choose, make sure it works with your room layout and lifestyle. And when you're ready to buy, head to John's Appliance for high-quality mattresses in both sizes, along with expert advice and customer service.
Frequently Asked Questions
A standard king mattress is 76" x 80" (193 cm x 203 cm), while a California king is 72" x 84" (183 cm x 213 cm). The King is wider, and the Cal King is longer.
Not necessarily. If both partners are tall or like more legroom, the Cal king might be better. But if you want more width to spread out (especially with pets or kids), the king is the better choice.
No. Cal king mattresses require specific sheets due to the size difference. Always double-check your sheet size before purchasing.
The king size is more common and generally easier to shop for when it comes to sheets, frames, and mattress toppers.
You can, but it might feel tight. A 12x14 or longer room is better suited for a Cal King to allow space around the bed for furniture and movement.
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Thanks to John and his team, John’s Appliance & Bedding has been able to provide our customers with the best appliances, mattresses, and cabinet solutions in South Florida. We view our customers as an extension of our family and seek to provide the best service and expertise that we always have.
Shop Cal King or King Mattress at John’s Appliance & Bedding
At John’s Appliance & Bedding, we provide high-quality, name-brand products at the best possible price. Shop in stock appliances online or visit one of our four South Florida showrooms and experience world-class customer service. Our friendly product experts are always happy to help you find the best California King and King mattresses for your bedroom—whether you call us, use our online chat feature, or visit us in person.