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Mattress size guide

Making sense of bed shapes and sizes.

While mattress sizes are fairly standard, brands often stray from reliable measurements. Add to that mattress thicknesses that can widely vary across types, with special sizes like twin XL and California king.

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Standard US mattress sizes

What size mattress do I need?

Make sure your new mattress will fit the bed frame or base you plan to use. If you're shopping for a new bed and mattress at the same time, you may be open to broader options based on your needs.

Crib

27 1/4 x 51 5/8 inches

  • Cribs for infants and toddlers

Twin

39 x 75 inches

  • Kids and teens

Twin XL

39 x 80 inches

  • College dorm rooms

Full

54 x 75 inches

  • Adult single sleepers

Queen

60 x 80 inches

  • Most couples

King

76 x 80 inches

  • Couples who like roomy sleeping space
  • Adults with pets or kids who sleep with them

California king

72 x 84 inches

  • Tall adults
  • Couples looking for extra space

Compare online bed-in-a-box mattresses

Name Product Filter Values Starting Price Financing Free shipping Free returns
AS4 by Amerisleep
AS4
Twin: $1,399
Moonlight Luxe by Helix Sleep
Moonlight Luxe
Twin: $895
Luxe is our premium line of mattresses taking your sleep to a whole new level with no harmful chemicals. The Moonlight Luxe features a soft top that lets you sink in like a cloud. Best for back and stomach sleepers or couples of different sleeping positions.
12" Pacific Breeze Gel Memory Foam by PlushBeds
12
Twin: $1,049
Awaken refreshed and energized on our best gel memory foam mattress. It provides optimal cooling comfort.
The Nest Bedding Hybrid Organic Latex by Nest Bedding
The Nest Bedding Hybrid Organic Latex
Twin: $1,983
A combination of pocketed support coils, foam, Dunlop latex and your choice of cotton or wool quilting. It comes in four firmness options: medium, firm, plush and soft with a topper.
Nolah Original 10" by Nolah mattress
Nolah Original 10
Twin: $499
mattress combining cooling pressure relief with superior back support. Now comes with an upgraded snow-white Tencel™ cover for added comfort.
Classic Mattress by Live and Sleep
Classic Mattress
Twin: $399
Cradling plush comfort with a deep support layer.
Latex Mattress 7" by Latex for Less
Latex Mattress 7
Twin: $699
Made with the finest quality 100% natural latex, organic cotton and pure natural wool. Certified by GOTS, Oeko-Tex Standard 100 and Eco-Institut. Reversible with 2 firmnesses in 1 latex mattress, for comfort.
AS1 by Amerisleep
AS1
Twin: $849
Dusk Luxe by Helix Sleep
Dusk Luxe
Twin: $895
Luxe is our premium line of mattresses taking your sleep to a whole new level with no harmful chemicals. Balanced feel for the top of your mattress with a little give. Best for back and stomach sleepers or couples of different sleeping positions.
The Puffy Mattress by Puffy Mattress
The Puffy Mattress
Twin: $495
Ranked as the best mattress for all sleeper types due to its excellent spine alignment support.
Luxury Bliss by PlushBeds
Luxury Bliss
Twin: $899
Natural latex and encased coils give you exceptional, buoyant support coupled with cool comfort for deep, restorative sleep.
Airweave Mattress Advanced by Airweave
Airweave Mattress Advanced
Twin: $2,180
An extra-firm mattress that offers ergonomic support for every body type and sleeping position.
Loom and Leaf Mattress by Loom & Leaf
Loom and Leaf Mattress
Twin: $849
DreamCloud Luxury Hybrid Mattress by DreamCloud
DreamCloud Luxury Hybrid Mattress
Twin XL: $899
The Luxury Hybrid combines layers of memory foam, latex, cashmere tufting and coil technology — all wrapped up in eight cloud-like layers.
Tulo Soft by Tulo Mattresses
Tulo Soft
Twin: $349
Part of the Tulo Comfort Series, this is the softest option available. Ideal for side sleepers and anyone looking for a cloud-like feel.
The Essential Mattress by Casper Mattress
The Essential Mattress
Twin: $395
Emily Natural Crib Mattress by My Green Mattress
Emily Natural Crib Mattress
Healthy sleep for your baby is our priority. Natural materials make this mattress perfect for your baby's crib.
Memory Foam Sofa Bed Mattress by PlushBeds
Memory Foam Sofa Bed Mattress
Twin: $249
Our Slice of Heaven memory foam sofa mattress offers a generous 4.5 inches of USA made premium memory foam and CertiPUR certified Plushfoam, made of billions of open-ended cells, resulting in a formula almost three times as dense as regular foam.
AS2 by Amerisleep
AS2
Twin: $999
9" Ocean Mistgel Memory Foam by PlushBeds
9
Twin: $499
Deep, more refreshing sleep is no longer just a dream. Extraordinary cool gel technology alleviates both moisture and heat for exceptional coolness, comfort, and luxury at an affordable price.
Botanical Bliss by PlushBeds
Botanical Bliss
Twin: $999
Our 100% natural latex mattresses are often recommended by orthopedic specialists and chiropractors.
The Alexander Signature Hybrid by Nest Bedding
The Alexander Signature Hybrid
Twin: $1,189
A blend of three layers of gel- and copper-infused memory foam and pocketed support coils. It comes in plush, medium and luxury firm.
Tulo Liv by Tulo Mattresses
Tulo Liv
Twin: $299
A mattress that’s soft, comfortable, supportive that other beds-in-a-box aren’t, and most of all – affordable.
Organic Mattress by Helix Sleep
Organic Mattress
Twin: $1,049
Free of any polyurethane based foams and harsh chemicals, designed with your complete safety in mind.
Leesa Mattress by Leesa
Leesa Mattress
Twin: $445
The Leesa mattress was designed to give you the perfect hug, bounce and incredible pressure relief. Whether you're a back, stomach or side sleeper, Leesa's Universal Adaptive Feel gives you soft support, for night after night of amazing rest.
Original 11" by BedInABox
Original 11
Twin: $594.15
11" of perfect, affordable comfort and support with CoolRest® Gel memory foam.
Original 9" by BedInABox
Original 9
Twin: $381.65
9" of perfect, affordable comfort and support with CoolRest® Gel memory foam.
Zinus Ultima Comfort by Amazon
Zinus Ultima Comfort
Twin: $150
Natural Bliss by PlushBeds
Natural Bliss
Twin: $1,899
No other mattress puts you closer to latex Naturally. Made with stretch certified organic cotton and is 100% wool free & animal free with our revolutionary Eco Fire Barrier.
The Wave Hybrid by Casper Mattress
The Wave Hybrid
Twin: $1,950
The brand’s most advanced mattress yet, featuring five layers of premium foam and springs, as well as enhanced cooling thanks to individually wrapped coils.
Latex Mattress 9" by Latex for Less
Latex Mattress 9
Twin: $799
Made with the finest quality 100% natural latex, organic cotton and pure natural wool. Certified by GOTS, Oeko-Tex Standard 100 and Eco-Institut. Reversible with 2 firmnesses in 1 latex mattress, for comfort.
Cool Bliss Gel Sofa Mattress by PlushBeds
Cool Bliss Gel Sofa Mattress
Twin: $299
Indulge your guests in the plush cooling comfort of our premium Cool Bliss gel memory foam sofa bed mattress with greater cooling properties and comfort benefits than traditional memory foam.
Natural Escape by My Green Mattress
Natural Escape
Twin: $829
This luxurious mattress takes the technology from our Pure Echo mattress and incorporates three inches of organic latex over the pocketed coil innerspring.
The Puffy Lux Mattress by Puffy Mattress
The Puffy Lux Mattress
Twin: $1,145
The Puffy Lux was designed to be the perfect mattress for back, side and stomach sleepers. Luscious comfort and exquisite support for your spine.
The Emma Mattress by Emma Mattress
The Emma Mattress
Twin: $499
Three layers of foam designed to keep you cool, comfortable and properly aligned while you sleep.
Ghostbed Mattress by Ghostbed
Ghostbed Mattress
Twin: $545
The GhostBed’s memory foam mattress is designed to provide proper comfort and support for every type of sleeper.
Organic Latex Mattress by Nest Bedding
Organic Latex Mattress
Twin: $2,512
Two layers of organic latex and topped with a layer of Talalay latex. It comes in firm or medium with a topper.
Ghostbed Flex Mattress by Ghostbed
Ghostbed Flex Mattress
Twin: $1,045
A hybrid mattress that combines the sturdy support of reinforced individually wrapped coils with the plush comfort of gel memory foam.
Sunset by Helix Sleep
Sunset
Twin: $500
Soft top of your mattress that lets you sink in like a cloud. Support designed to relieve pressure points. Best for side sleepers or people who toss and turn all night long.
Azul by BedInABox
Azul
Twin: $799
We took our most advanced memory foam mattress (Serenity), and combined it with our most popular memory foam mattress (PacBed Original), to create the perfect reflection of both in one awesome bed!
Luxury Mattress by Live and Sleep
Luxury Mattress
Twin: $599
Cool and plush memory foam and firm core support.
The Alexander Signature Series by Nest Bedding
The Alexander Signature Series
Twin: $1,322
Four foam layers with cooling technology, topped with a quilted cool stretch fabric cover. Choose from medium or luxury firm.
AmazonBasics Memory Foam Mattress 12" by AmazonBasics
AmazonBasics Memory Foam Mattress 12
Our memory-foam mattress comes with 3 foam layers for optimal softness and support.
AS5 by Amerisleep
AS5
Twin: $1,799
Nightfall by Helix Sleep
Nightfall
Twin: $600
Designed for plus size and big and tall with maximum support.
The Casper Mattress by Casper Mattress
The Casper Mattress
Twin: $1,650
Features a Zoned Support system that offers firmer support under your hips and core, and softer foam under your shoulders to relieve pressure and help you stay comfortable. Four layers of foam with open-cell formation aim to help you stop overheating while you sleep.
AmazonBasics Memory Foam Mattress 8" by AmazonBasics
AmazonBasics Memory Foam Mattress 8
Our memory-foam mattress comes with 3 foam layers for optimal softness and support.
Emma Mattresses by Emma Mattress
Emma Mattresses
The Classic Saatva Mattress by Saatva
The Classic Saatva Mattress
Twin: $599
The Classic Saatva Mattress combines individually wrapped steel coils, memory foam, foam-encased antisag edge support and a plush pillow top layer.
Tranquillium by BedInABox
Tranquillium
Twin: $764.15
2" and three layers of perfect, supportive comfort infused with CoolRest® technology. Soft, cool and comfortable.
Happsy Organic Mattress by Happsy
Happsy Organic Mattress
Twin: $899
The certified-organic Happsy mattress is made of eight inches of pocketed springs and two inches of natural latex, topped with a thin layer of organic wool batting for comfort. The cover is made of 100% organic cotton.
Twilight by Helix Sleep
Twilight
Twin: $500
Firm top of your mattress with no sink or give. Support designed to relieve pressure points. Best for side sleepers or people who toss and turn all night long.
Layla Memory Foam Mattress by BedInABox
Layla Memory Foam Mattress
Twin: $474
A flippable mattress for all types of sleepers, with two firmness options in one mattress, we’ve got you covered.
Dual Extra by Helix Sleep
Dual Extra
Queen: $1,145
Soft feel on one side, firm feel on the other. With Body Contouring, perfect for back and stomach support.
Zenhaven Natural Latex by Zenhaven
Zenhaven Natural Latex
Twin: $1,299
The Zenhaven mattress builds two firmness levels into a single mattress. Simply flip over the mattress to try each level for your best sleep.
Tulo Firm by Tulo Mattresses
Tulo Firm
Twin: $349
Part of the Tulo Comfort Series, this mattress is the firmest option available. Ideal for back sleepers and anyone needing extra spinal support.
Natural Latex Sofa Bed Mattress by PlushBeds
Natural Latex Sofa Bed Mattress
Twin: $349
Our natural latex sofa bed mattress is made with a generous serving of 100% Natural Sri Lankan Botanical Latex with no fillers or blends and reinforced with a CertiPUR certified Plushfoam layer.
Dual Hybrid by BedInABox
Dual Hybrid
Twin: $934.15
13" of luxurious comfort featuring the highest coil count in the industry for advanced pressure relief and unbeatable support.
The Nod by Tuft & Needle
The Nod
Twin: $275
The Nod is built with an extra adaptive transition layer, added edge support, 30% more cooling gel beads, 30% more heat-wicking graphite and an even cozier knitted cover.
Dual Balance by Helix Sleep
Dual Balance
Queen: $1,145
Soft feel on one side, firm feel on the other. Great pressure relief, perfect for side sleeper support.
The Wave by Casper Mattress
The Wave
Twin: $1,650
Features a special support system that contours to your shoulders and complements the curves of your back and hips for firmer support where you need it most. Plus, its five layers of foam with open-cell formation help to push heat away from your body to keep you cool all night.
The Original Purple Mattress by Purple Mattress
The Original Purple Mattress
Twin: $699
Two layers of supportive foam, topped with two inches of Hyper-Elastic Polymer and a breathable stretch knit cover.
Big Kid's Bed by Nest Bedding
Big Kid's Bed
Twin: $396
Two layers of foam specifically designed for kids. It can be used on any foundation or bunk beds.
Elite Mattress by Live and Sleep
Elite Mattress
Twin: $499
Cooling firm comfort with total body support.
Yaasa ONE Mattress by Yaasa
Yaasa ONE Mattress
Twin: $549
Tried and tested again and again to get it right, we finally found the magic ingredients for that perfect support. Whether you love a firm or a soft mattress, we have the perfect solution just for you.
The T&N Original Mattress by Tuft & Needle
The T&N Original Mattress
Twin: $350
Made of two foam layers, the original Tuft & Needle mattress is built to provide support that’s not hard or unforgiving. The bottom support layer is topped with a thinner layer of adaptive foam, which contains heat-wicking graphite and cooling gel to keep you comfy throughout the night.
The All-New Purple Mattress – Soft by Purple Mattress
The All-New Purple Mattress – Soft
Twin XL: $2,499
Two layers of supportive foam, plus a layer of pocketed responsive spring coils. The All-New Purple Mattress (Soft) is topped with four inches of Hyper-Elastic Polymer and a knit cover.
The Allswell by Allswell
The Allswell
Twin: $245
The brand’s original mattress is made of memory foam and two coil gauges topped with CoolFlow foam for enhanced breathability.
The All-New Purple Mattress – Firm by Purple Mattress
The All-New Purple Mattress – Firm
Twin XL: $1,299
Two layers of supportive foam, plus a layer of pocketed responsive spring coils. The All-New Purple Mattress (Firm) is topped with two inches of Hyper-Elastic Polymer and a knit cover.
The All-New Purple Mattress – Medium by Purple Mattress
The All-New Purple Mattress – Medium
Twin XL: $1,899
Two layers of supportive foam, plus a layer of pocketed responsive spring coils. The All-New Purple Mattress (Medium) is topped with three inches of Hyper-Elastic Polymer and a knit cover.
Natures Novel Latex Mattress by Sweet Zzz
Natures Novel Latex Mattress
Twin: $754
When nature and science write a novel
The Casper Mattress Hybrid by Casper Mattress
The Casper Mattress Hybrid
Twin: $1,950
Features four layers of memory foam, plus springs and enhanced cooling technology. This is the new, upgraded version of the original Casper model so many know and love.
The Allswell Luxe Hybrid by Allswell
The Allswell Luxe Hybrid
Twin: $395
A luxury hybrid mattress consisting of memory foam, individually wrapped coils and a built-in plush topper. It is two inches thicker than the Allswell.
AS3 by Amerisleep
AS3
Twin: $1,099
Pure Echo by My Green Mattress
Pure Echo
Our popular and most economical mattress with a new more comfortable spring system that offers excellent lumbar support.
Certified Organic Mattress by Nest Bedding
Certified Organic Mattress
Twin: $2,512
Made of certified organic materials in a certified organic facility. This mattress consists of a latex layer wrapped in organic cotton, a layer of pocket-coil springs and the brand’s signature quilted woven cover.
Leesa Hybrid Mattress by Leesa
Leesa Hybrid Mattress
Twin: $895
Our most advanced luxury hybrid mattress. Premium foams and springs for enhanced pressure relief with edge-to-edge support.
Twilight Luxe by Helix Sleep
Twilight Luxe
Twin: $895
Luxe is our premium line of mattresses taking your sleep to a whole new level with no harmful chemicals. Firm top of your mattress with no sink or give. Best for side sleepers or people who toss and turn all night long.
Kiwi Bunk Bed Mattress by My Green Mattress
Kiwi Bunk Bed Mattress
Twin: $599
With a shorter spring system, we've taken our Kiwi mattress and designed it to meet the 8 inch height requirement of most bunk beds. Similar support and feel, meant for smaller bodies.
Midnight by Helix Sleep
Midnight
Twin: $500
Balanced feel for the top of your mattress with a little give. Support designed to relieve pressure points. Best for side sleepers or people who toss and turn all night long.
Tulo Medium by Tulo Mattresses
Tulo Medium
Twin: $349
Part of the Tulo Comfort Series, this medium-firm bed offers a balance of cushy comfort and added spinal support.
AmazonBasics Memory Foam Mattress 10" by AmazonBasics
AmazonBasics Memory Foam Mattress 10
Our memory-foam mattress comes with 3 foam layers for optimal softness and support.
The Puffy Royal Mattress by Puffy Mattress
The Puffy Royal Mattress
Twin: $1,645
Stomach sleepers, side sleeper, and back sleepers – the Puffy Royal is for you.
The Nectar Mattress by Nectar Sleep
The Nectar Mattress
Twin: $399
The Nectar Mattress consists of two foam base layers, two gel memory foam layers and a Tencel cooling cover.
The Nest Bedding Hybrid Latex by Nest Bedding
The Nest Bedding Hybrid Latex
Twin: $1,322
10" Aslan GEL Memory Foam Mattress by Aslan Mattress
10
Twin: $749
The Aslan Mattress comes with three layers of specialized memory foam to give you a cool, comfortable sleep no matter your preferred sleeping position.
Moonlight by Helix Sleep
Moonlight
Twin: $500
Soft top of your mattress that lets you sink in like a cloud. Support designed to contour to your body. Best for back and stomach sleepers or couples of different sleeping positions.
Nimbus by BedInABox
Nimbus
Twin: $467.50
11" of affordable comfort and support, giving you the benefits of latex and memory foam in one mattress.
Midnight Luxe by Helix Sleep
Midnight Luxe
Twin: $895
Luxe is our premium line of mattresses taking your sleep to a whole new level with no harmful chemicals. Balanced feel for the top of your mattress with a little give. Best for side sleepers or people who toss and turn all night long.
Dawn by Helix Sleep
Dawn
Twin: $500
Firm top of your mattress with no sink or give. Support designed to contour to your body. Best for back and stomach sleepers or couples of different sleeping positions.
Dawn Luxe by Helix Sleep
Dawn Luxe
Twin: $895
Luxe is our premium line of mattresses taking your sleep to a whole new level with no harmful chemicals. Firm top of your mattress with no sink or give. Best for back and stomach sleepers or couples of different sleeping positions.
Natural Latex Mattress by Nest Bedding
Natural Latex Mattress
Twin: $1,586
Two layers of Dunlop latex and topped with a layer of Talalay latex. It comes in firm, medium and soft with a topper.
Birch Organic Mattress by Helix Sleep
Birch Organic Mattress
Twin: $849
The Birch mattress was designed by Helix, the team behind the leading mattress brand in customized sleep. We’ve lived and breathed creating the most comfortable sleep products for years with over 100,000 customers. Birch takes those learnings in comfort and uses all natural & organic materials.
Hope Latex Mattress by My Green Mattress
Hope Latex Mattress
Twin: $829
Our spring-free, all-natural Hope Latex Mattress is perfect for anyone looking for a contouring mattress with a comfortable plush surface.
Sweetnight Mattress by Sweetnight
Sweetnight Mattress
Twin: $318
GhostBed Luxe Mattress by Ghostbed
GhostBed Luxe Mattress
Twin: $1,145
The only mattress with core and surface cooling tech that will keep you and your mattress cool and comfy all night long.
The Pod by Eight Sleep
The Pod
Full: $1,935
The most advanced sleep system featuring dynamic heating and cooling.
Chirofoam Mattress by Chirofoam Mattress
Chirofoam Mattress
Twin: $690
Recover Mattress by Recover Mattress
Recover Mattress
Twin: $549
To prevent injury and improve performance, athletes need nighttime support—especially for their spine. The design team at Recover Mattress has studied exactly how an exhausted athlete sleeps. Then, we developed cutting-edge technology to treat all the observed pressure points.
Smart Bed by Eight Sleep
Smart Bed
Full: $895
A medium-soft mattress paired with smart cover for sleep enhancement.
The Chirofoam XF Mattress by Chirofoam Mattress
The Chirofoam XF Mattress
Twin: $540
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Compare up to 4 providers

How does mattress sizing differ between the US and Europe?

Twin/single

39 x 75 inches

35 x 75 inches

36 x 74 inches

Twin XL

39 x 80 inches

Not available

Not available

Full/double

54 x 75 inches

53 x 75 inches

54 x 75 inches

Queen

60 x 80 inches

Not available

60 x 80 inches

King

76 x 80 inches

60 x 78 inches

72 x 80 inches

California king/super king

72 x 84 inches

71 x 79 inches

72 x 84 inches

Standard pillowcase sizes

Pillows come in four main sizes: toddler, standard, queen and king.

Toddler

13 x 18 inches

Standard

20 x 26 inches

Queen

20 x 30 inches

King

20 x 36 inches

Bottom line

As the saying goes, measure twice and buy once.

Before buying a new mattress, confirm the dimensions of your existing bed frame, base or platform to make sure it fits. Cross-check your measurements with the brand you're interested in, as sizes can vary across brands.

Learn more in our mattress buying guides, brand reviews, coupons pages and more.

Frequently asked questions

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