What size is a king mattress?

A king size mattress is 76 inches in width by 80 inches in length.

What is the difference between a king size mattress and a California king size?

A standard king size mattress is more square in shape, while a California king looks more rectangular. California king mattresses are smaller in width but larger in length than king size mattresses, coming in at 72 inches wide and 84 inches long. King mattresses, in comparison, are 76 inches wide and 80 inches long.

Which is the best king size mattress?

For a king size mattress that’s going to give you a comfortable yet supportive night’s sleep, the Puffy Lux Hybrid provides a versatile night of sleep ideal for those who struggle with chronic back pain. If full-body support and advanced cooling features are what you’re after, the Puffy Royal Hybrid is perfect. Finally, for an all-foam king-size mattress option, the Puffy Mattress features five award-winning layers that are guaranteed to leave you sleeping better.

Discover the Best King Size Mattresses

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King Mattress Size Guide

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

Mattress Sizes And Dimensions Chart

Find the dimensions of all standard US mattress sizes below.

Mattress Size	Dimensions in Inches	Dimensions in Centimeters
Twin	38” x 75”	96.5 x 190.5
Twin XL	38” x 80”	96.5 X 203
Full	54" X 75"	137 X 190.5
Queen	60" X 80"	152 X 203
King	76" X 80"	193 X 203
California King	72" X 84"	183 X 213
Split King	76" X 80"	193 X 203

Why Buy A King Size Mattress?

King size beds are a luxurious option for couples and spacious master bedrooms.

An ideal family bed

For families with children or pets, it’s wise to size up so snuggle time stays comfy.

Easy movement

Sleepers who move in their sleep benefit from the spacious king-sized mattress.

Great for couples

A roomy king size mattress works great for couples who need space in their sleep.

Puffy King Size Memory Foam Mattress

The naturally body-contouring properties of an all-foam mattress relieves pressure points and keeps you comfy all night.

The Original

Puffy Mattress

Our award-winning all-foam mattress is the original Puffy model and has been ranked one of the most comfortable mattresses in America. Featuring five comfort layers that have specialized temperature regulation and cooling properties, experience true cloudlike sleep.

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Puffy King Size Hybrid Mattresses

The king size hybrid mattresses bring together the plush comfort of foam mattresses with the structured support of coils. Choose between two luxurious options for better sleep.

Puffy Lux Mattress Hybrid

The Puffy Lux Hybrid is our best-selling model and has been ranked America’s most comfortable mattress. With six unique layers, the king-sized Puffy Lux Hybrid is a luxurious option that works for sleepers who like extra space when catching up on their sleep.

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Puffy Royal Mattress Hybrid

Our premium model, the Puffy Royal Hybrid, is our softest mattress. 7 cooling layers ensure you get a consistently comfortable sleep, with unique zoned support technology that prevents strain on your pressure points. The king-sized Royal Hybrid is ideal for sleepers who share their beds.

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Feels Like Sleeping on a Cloud

Puffy mattresses have been designed for your best night’s sleep. For cloudlike comfort that you’ll notice as soon as you lie down, here’s what makes our mattresses so special:

Climate Comfort™

Formulated to minimize temperature fluctuation, Climate Comfort™ Foam keeps your sleep consistently cool. Humidity-resistant and hypoallergenic, this 2” layer keeps you comfy, even if your core body temperature rises.

Cooling Cloud™

Cooling Cloud™ Foam is infused with cooling gel to disperse heat from the body and ensure air circulation. Advanced pressure relief keeps your joints and muscles well-relaxed.

Why Puffy is America’s Mattress

Every part of the Puffy mattress is proudly designed and manufactured in the USA. We believe nothing beats American innovation, and we’re proud to design and manufacture our mattresses where we first conceived of Puffy.

The Puffy mattress has been crafted to deliver the perfect balance of comfort, cooling, and pressure relief. That’s why we’ve been ranked the best mattress in America.

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6 (More) Reasons to Choose a Puffy King Size Mattress

Sleep tight. 101 nights. Risk-free.

Test your Puffy risk-free with our 101-night sleep trial.

Financing.

Mattress financing options as low as 0% APR with Klarna.

Warranty. For life.

Sleep soundly knowing every Puffy mattress comes with a lifetime warranty.

Free shipping. Free returns. Always.

Great sleep should be easy. We take care of the shipping. And returns. Hassle-free.

Setup simplified.

We make setup easy. Just remove the box, unroll your mattress, and let it expand.

Made in USA.

Every Puffy mattress is designed and manufactured in the USA.

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Why Customers Love Puffy King Size Mattresses

Verified Review

BEST mattress I have slept on

After a lot of research, I decided to get a king size mattress from Puffy. This is the best mattress I have ever slept on and what's better, I paid less than I ever would have if I went with the foster-pedic or the others at the local store.

- Horace P.

Verified Review

Amazing mattress for an amazing price

Amazing mattress for an amazing price. My husband is around 325 lbs and I'm around 230 lbs. We bought the king size and I waited about 2 months so I could leave an honest appraisal. It doesn't get warm, it doesn't sink down, and it feels incredible. I'm not sure how they offer this mattress at the prices they have listed but it is just fantastic.

- Patricia G.

Verified Review

Happy Family

We decided to upgrade our queen mattress to a new king and did quite a bit of research before choosing Puffy and I am so glad we went with you guys. The reviews are definitely accurate and my hubby and 2 kids love getting on to watch movies together!

- JW P.

FAQ

What size is a king mattress?

A king size mattress is 76 inches in width by 80 inches in length.
What is the difference between a king size mattress and a California king size?

A standard king size mattress is more square in shape, while a California king looks more rectangular. California king mattresses are smaller in width but larger in length than king size mattresses, coming in at 72 inches wide and 84 inches long. King mattresses, in comparison, are 76 inches wide and 80 inches long.
Which is the best king size mattress?

For a king size mattress that’s going to give you a comfortable yet supportive night’s sleep, the Puffy Lux Hybrid provides a versatile night of sleep ideal for those who struggle with chronic back pain. If full-body support and advanced cooling features are what you’re after, the Puffy Royal Hybrid is perfect. Finally, for an all-foam king-size mattress option, the Puffy Mattress features five award-winning layers that are guaranteed to leave you sleeping better.