Find a store

King Mattresses

Shop award-winning king size mattresses for great sleep, at an even greater price.

15% OFF - ENDS 2/28

Original Hybrid

King
Price: $1,895 Sale Price: $1,610.75
Firmness: Medium
Our top-rated mattress with enhanced airflow.
Ergonomic Support
Firm Support
Cooling Technology
Advanced Cooling
40% OFF

Nova Hybrid Medium

King
Price: $3,095 Sale Price: $1,857
Firmness: Medium-Soft
For sleepers looking for the softest comfort.
Ergonomic Support
Firm Support
Cooling Technology
Advanced Cooling
30% OFF - ENDS 2/28

Wave Hybrid

King
Price: $3,695 Sale Price: $2,586.50
Firmness: Medium
Our most supportive mattress, for max relief.
Ergonomic Support
Firm Support
Cooling Technology
Advanced Cooling
15% OFF - ENDS 2/28

Snow

King
Price: $2,395 Sale Price: $2,035.75
Firmness: Medium
Enhanced comfort & support with cooling.
Ergonomic Support
Firm Support
Cooling Technology
Advanced Cooling
30% OFF - ENDS 2/28

Wave Hybrid Snow

King
Price: $4,195 Sale Price: $2,936.50
Firmness: Medium
Max support meets our most advanced cooling.
Ergonomic Support
Firm Support
Cooling Technology
Advanced Cooling
15% OFF - ENDS 2/28

The Casper

King
Price: $1,395 Sale Price: $1,185.75
Firmness: Medium-Firm
For comfortable sleep at a cozy price.
Ergonomic Support
Average Support
Cooling Technology
Advanced Cooling
15% OFF - ENDS 2/28

Original

King
Price: $1,695 Sale Price: $1,440.75
Firmness: Medium-Firm
Our most popular mattress for better sleep.
Ergonomic Support
Firm Support
Cooling Technology
Advanced Cooling

How big is a King size mattress?

A king size bed is 80 inches long and 76 inches wide.


Mattress sizing chart

Twin Mattress - 38" x 75"

Often found in kid's rooms and studio apartments.

Twin XL Mattress - 38" x 80"

Often found in college dorm rooms and studio apartments

Full Mattress - 53" x 75"

Often found in guest rooms.

Queen Mattress - 60" x 80"

Often found in master bedrooms.

King Mattress - 76" x 80"

Often found in extra large master bedrooms.

California King Mattress - 72" x 84"

Often found in extra large master bedrooms, perfect for gathering the family.

Settling for an OK mattress? Dream bigger.

If you’ve never flopped down, and drifted off on a Casper King, it’s almost impossible to imagine this kind of regal comfort. The King size bed is a glorious 76 inches wide and 80 inches long, making it perfect for anyone who needs more sleeping space.

Precision engineered for astonishing comfort.

With multiple layers of breathable, feathery-soft memory foam, our king mattresses deliver cooling, weightless sleep. Our Zoned Support design cradles you weightlessly, for night after night of cloud-like slumber.

Quality-built for years of dreaming.

Our standard King size mattresses are designed in the USA using premium materials, certified safe for your family and the environment. Oh, and they come with a 10-year limited warranty.²

King Size Hybrid Mattresses

Embark on a journey towards unparalleled comfort with our king size hybrid mattresses. Merging the adaptive support of encased springs with the plush coziness of memory foam, these hybrid king mattresses are crafted to mold to your body while offering a gentle lift. Our meticulous design champions seamless airflow, ensuring you stay cool as you drift off into dreamland. Explore below and uncover a harmonious blend of snugness, support, and cooling technology, perfectly tailored to elevate your sleep sanctuary.

Which Casper King Size Hybrid Mattress is right for you?

There are three versions to choose from if you're looking for a King. Our hybrid collection combines the pressure relief of our original foam with the added lift from resilient springs.

The Wave Hybrid
Wave Hybrid Mattress

The Wave Hybrid

The Wave Hybrid combines the powers of springs, gel and memory foam for the supreme dream state. The five layers give you the most support using innersprings for added lift, and foam and gel for Hyper-Targeted support to provide contouring spine alignment.

The Nova Hybrid
Nova Hybrid Mattress

The Nova Hybrid

Our Nova Hybrid features a luxuriously soft top layer making it our most plush mattress. It features hundreds of resilient springs, added lift, airflow, and a bit of bounce to have you sleeping in the clouds.

The Original Hybrid
Original Hybrid Mattress

The Original Hybrid

Our award winning Original mattress, upgraded. The Original Hybrid combines the best of both worlds with resilient springs as the base for added lift and our proprietary foam for pressure relief. The "just right" feel is now even better.

King Size Memory Foam Mattresses

Dive into a sea of calm with our King-Size Memory Foam Mattresses. Masterfully engineered with advanced memory foam technology, each mattress is a passport to a world where your body’s contours are cradled, aligning your spine and easing life’s pressures as you rest. Our memory foam mattresses are your ticket to a sleep-friendly climate, striking a fine balance between embracing comfort and cool breathability. Browse below and discover a haven of sleep luxury that aligns with your unique comfort desires.

Which Casper King Size Memory Foam mattress is right for you?

Want an extra layer of supportive memory foam for your Casper King Size bed? Or perhaps you’d prefer a more streamlined model? Don’t worry - we’ve got you covered. Take a peek at these Casper King options:

The Original
The Original

The Original

Our award winning Original king bed was engineered using feedback and data from customers like you. If sleeping on a cloud sounds good, consider this your sweet spot.

The Casper
Casper Mattress

The Casper

The Casper delivers Casper's signature "just right" feel (not too firm, not too soft) while keeping you cool and comfortable at a lower price.

Memory Foam vs. Hybrid King Size Mattresses

Memory foam king size mattresses are known for their exceptional body contouring and motion isolation, ensuring every sleeper feels cradled throughout the night. They offer a personalized sleep experience by molding precisely to your body, optimizing pressure relief.

Hybrid mattresses elevate the game by blending the unmatched comfort of memory foam with the robust resilience of springs. This combination results in a mattress that not only provides the coziness of memory foam but also ensures enhanced airflow, superior edge support, and a slightly buoyant feel.  

Interested in learning more? Read through our comprehensive memory foam vs. hybrid mattresses guide.

Frequently Asked Questions

The main difference between a king and a California king is the mattress size. A standard king mattress is 76" x 80", while a california king mattress is 72" x 84". If you’re deciding between the two, we recommend taking measurements to ensure the Cal king will fit, allowing enough space for the bed frame which can add inches to the perimeter of the mattress depending on the design.

A split king mattress has the same dimensions as a standard king, but can be beneficial for couples who have different preferences or opt for an adjustable base. The combination of the split king mattress with the adjustable base enables both partners full control of their side of the bed while providing increased motion isolation.

Would it surprise you to learn that an eastern king shares the same standard mattress sizes as the standard king? Well, it’s true - there really is no difference! According to mattress lore, the Eastern king was nothing more than a counter to the California king, created by a Los Angeles merchant shortly after the Second World War. Since we’ve come to think of this size as a standard king, the “Eastern” has largely dropped off.

If you’re upgrading from a full or queen mattress to a king, you may want to consider upgrading your pillows as well. Two standard pillows will leave about 12 inches of empty mattress on either side of them, while two king size pillows fit across a king size mattress with about 4 inches on each side.

Learn more in our guide on pillow sizes.

For sleepers looking for maximum support and pressure relief, our hybrid king mattress options offer the plush feel of a memory foam mattress with the support of a sturdy box spring mattress. For couples who want to be together while maintaining their own sacred sleeping space, a split king might be the best fit. If you’re feeling torn, schedule a virtual mattress consultation with one of our Sleep Specialists.

How Casper keeps prices low and quality high

When Casper was founded in 2014, many people were skeptical. Would consumers really buy a standard king size mattress without testing it first? Several years and numerous awards later, we have an answer: It turns out no one likes visiting stuffy mattress showrooms to make high-stakes purchases under the scrutiny of needy salespeople. (Who knew??)

Everyone loves the ease and convenience of buying online from a trusted source, and having a high-quality mattress shipped in a box to their doorstep. And people keep spreading the word that our mattresses deliver unparalleled comfort and support, top-notch construction quality, and high-tech, innovative design.

But the Casper experience isn’t just about quality, trust, and transparency. Our mattresses are a mere fraction of other brands’ prices. That’s because we’ve flipped the mattress industry on its head. By eliminating showrooms and middlemen, we keep our costs low - and pass those savings on directly to you.

Shop the Original King Mattress