Best online mattress size guide

Olympic Queen or Texas King: How to Pick the Right Mattress Size

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Buying the best online mattress won’t help you much if you choose the wrong size. Many people tend to underestimate how much personal space they need to sleep comfortably.

Couples are especially prone to buying too-small mattresses. You never realize just how cramped the bed was until you ditch your double mattress for a king size.

The best mattress size will depend on your situation and preferences. Obviously, the more you are in the bed the bigger the mattress needs to be. A larger mattress will also be more comfortable if you prefer sprawling out on your bed as you sleep.

Here’s a simple test for couples to determine whether a mattress is big enough. Lie on your back on the mattress and put your hands under your head. If your elbows are too close or are touching, the mattress is too small. If there is a good distance between your elbows, it has plenty of space for both of you.

It also goes without saying that the mattress needs to be a match, size-wise, to your bed. But if you want a smaller or bigger mattress than your bed, you can always buy a new matching box spring or foundation. In fact, most online mattress companies sell a variety of frames alongside their mattresses.

Mattress Size Chart

Mattress sizes can be split into two general groups: standard sizes and specialty sizes. Here are the common dimensions for each size.

Note: Exact dimensions may slightly vary by an inch or two among different brands.

Standard Sizes

Crib mattress 27” x 52”
Twin size 38” x 75”
Full (double) size 54” x 75”
Queen size 60” x 80”
King size 76” x 80”

Specialty Sizes

Small single mattress 30” x 75”
Twin XL 38” x 80”
Small double 48” x 75”
Double XL 54” x 80”
Olympic queen 66” x 80”
California king 72” x 84”
Grand king/Texas king 80” x 98″

Of course most mattress brands are not available in all these sizes. Some like the Texas king size are not very common. The most common ones you’ll find online and in stores are twin, twin XL, full, queen, king and California king.

Choosing the Right Mattress Size

Choosing the best online mattress size

Crib/Toddler mattress

This is the first mattress you buy for your toddler. This size is usually okay until around 2 years of age when you’ll need to move up to a twin size.

Remember to check that the crib mattress is firm enough. It shouldn’t be too soft nor should it have a pillow top. The extra softness can be dangerous to babies.

Twin size

A twin size mattress is perfect for kids who are just about growing past their cribs. Kids can sleep on it until they are much older.

Twin sizes are also great for a guest bed, on a daybed or for a small room. But note that the mattress may not be long enough for some adults. For adults, you should probably consider a twin XL.

Twin XL

A twin XL is just as wide as a twin size but 5 or 6 inches longer. This provides more feet space for taller adults or children.


A full or double size mattress is 15 to 16 inches wider than a twin size mattress. It’s best for a single adult. But note that it’s just as long as a twin. So if you are tall, get the specialty double XL mattress.

You should also consider getting a full size mattress for your child instead of a twin or twin XL. It not only ensures they’ll not outgrow it, it also provides enough space for them to sit up or sprawl around. It also comes in handy during sleepovers with friends. Two kids can fit in it without any problem.


This is the standard size for couples. It’s wide enough such that everyone has enough personal space and long enough for taller adults.

For couples who find the standard queen too small but don’t want to get a King size, consider the specialty Olympic queen size.


A king size bed gives each person roughly a twin-size bed of personal space. This is plenty enough to spread your arms and roll without disturbing the other person.

You also get plenty of length to stretch your feet.

Before buying a King size mattress, make sure it will fit through doorways and corridors. Also check that there will be enough space for it in the bedroom.

California King

A California king is best for longer bedrooms. It’s 4 inches narrower than a standard King but 4 inches longer.

Custom and Split Sizes

If you are planning to buy a queen or larger mattress but you are not sure it will fit the doorway or corridor, buy a split mattress.

Some companies offer a split option where the mattress comes in two halves that can easily be joined together again. A split mattress is also ideal if you and your partner have different comfort needs.

Some companies also offer custom sizes. These are great for situations where standard sizes won’t do such as boats or in an RV.

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Of the 60+ beds I've reviewed, these are my current favorites:
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Mattress toppers & pads are a great way to cool your bed and extend its life.
Topper SizeMaterialFirmnessWarr.
LINENSPA 2 Inch Gel Infused Memory Foam Mattress Topper, Twin
Best Value2"Gel memory foamMedium3 years
Best Comfort3"Memory foamMedium-firm5 years
MyPillow Three-inch Mattress Bed Topper (Twin)
Best pressure point relief3"FoamMedium-firm10 years
LUCID 2-Inch Ventilated Gel Infused Memory Foam Mattress Topper - Full
Best cooling2"Gel memory foamSoft3 years
Milemont Mattress Topper Twin, 2-Inch Cool Swirl Gel Mattress Topper for Twin Size Bed, Blue
Best for back pain2"Gel memory foamMedium10 years
Pure Green
Pure Green 100% Natural Latex Mattress Topper - Firm - 2 Inch - Queen Size
Best for stomach sleepers2"Natural latexExtra-firm5 years
Sleep Innovations
Sleep Innovations 4-inch Dual Layer Gel Memory Foam Enhanced Support, King, Made in the US Mattress Topper
Best for side sleepers4"Gel memory foamSoft10 years
Sleep Number DUAL TEMP
Sleep Number DUAL TEMP
Best temperature regulation-Forced Air-1 year
Tempur-Pedic TEMPUR Supreme 3-Inch Mattress Topper Medium Firm, Full, White
Best memory foam3"Memory foamMedium-firm10 years
Avocado Green
Avocado Green
Best organic2"Organic latexSoft/firm10 years
Bed cooling/heating systems have come a long way – especially the BedJet, my favorite.
SystemTypeBest For...Temp. RangeControl
BedJet V3
BedJet V3
Air cooledBEST OVERALL (esp. for night sweats)66°F-104°FWireless remote control/smartphone app
ChiliPad Cube 3.0
Chili Technology chiliPAD Cube 3.0 - ME and WE Zones - Cooling and Heating Mattress Pad - Individual Temperature Control, Great Sleep Enhancement, Wireless Remote Integration (Queen (80" L x 60" W))
Water cooledBest water cooling system55°F-115°FWireless remote control
Ooler Sleep System
Ooler Sleep System
Water cooledBest temperature control55°F-115°FSmartphone app via Bluetooth
The Pod by Eight Sleep
The Pod by Eight Sleep
Water cooledBest smart cooling system55°F-115°FSmartphone app/smart voice assistant
Mattress Cooler "Classic"
2020 Mattress Cooler "Classic" Chilled Water Sleep Cooling System (Now with a Spare "27x63" Cooling Pad)
Water cooledBest budget cooling systemN/AWireless remote control
SleepNumber Dual-Temp v3
SleepNumber Dual-Temp v3
Air cooledN/ARemote control
bFan Cooling System
bFan Cooling System
FanBest bed fanN/AWired remote control
Brookstone bed fan
Brookstone Bed Fan with Wireless Remote
FanN/AWireless remote control
These pillows excel at relieving neck and shoulder pain:
PillowWhy I Like It
PlushBeds Shredded Natural Latex Pillow
Best Cooling Mattress Pads

best shredded latex pillow for side sleepers
Coop Home Goods Memory Foam
Coop Home Goods - Premium Adjustable Loft Pillow - Hypoallergenic Cross-Cut Memory Foam Fill - Lulltra Washable Cover from Bamboo Derived Rayon - CertiPUR-US/GREENGUARD Gold Certified - Queen
perennial, proven Amazon Choice with over 16,000 reviews
MARNUR Contour Pillow
MARNUR Cervical Memory Foam Pillow Orthopedic Contour Pillows for Neck Pain Ergonomic Pillow with RoHS Certification and Pillowcase Covers, White(23.5×14.5×5.5 Inch)
perfect spine support using a groove down the middle
SleepRightSplintek Side
SleepRight Splintek Side Sleeping Pillow Memory Foam Pillow – Best Pillow for Sleeping On Your Side – 24" x 5" Standard Size
full facial cradle plus a perfectly-angled shoulder cradle
Xtreme Comforts Adjustable Pillow
Xtreme Comforts Hypoallergenic, Adjustable Thickness, Kool-Flow Micro Vented Bamboo Shredded Memory Foam Bed Pillow for Sleeping, Back, Stomach & Side Sleepers, Queen Size, Made in USA
thinner and softer than most, so your head will not bend back
UTTU Sandwich Pillow
UTTU Sandwich Pillow, Adjustable Memory Foam Pillow, Bamboo Pillow for Sleeping, Cervical Pillow for Neck Pain, Neck Support for Back, Stomach, Side Sleepers, Orthopedic Contour Pillow, CertiPUR-US
designed specifically for neck support and alignment.
Mediflow Water Pillow
Mediflow Fiber: The First & Original Water Pillow, clinically Proven to Reduce Neck Pain & Improve Sleep. Therapeutic, Ideal for People Looking for Proper Neck Support
clinical tests prove it reduces neck pain
Cradle Me Cervical Pillow
Cradle Me Cervical Pillow - Orthopedic Contour Memory Foam Pillow for Back and Side Sleepers with Neck and Spine Support - Helps Reduce Back and Neck Pain
best overall design with lots of position choices
KaUa Neck Roll
K Ka Ua Neck Roll Pillow Cervical Bolster with Bamboo Cover – Memory Foam Spine Lumbar Traction Spondylosis Support 4” Diameter x 17 “Length (4 Inch)
1,000s of satisfied customers & rave reviews
J-Pillow Travel Pillow
J-Pillow Chin Supporting Travel Pillow - 2020 Version - British Invention of The Year Winner - Supports Your Head, Neck & Chin (Blue)
added chin support prevents your head from falling forward.
EPABO Contour Memory Foam Pillow
EPABO Contour Memory Foam Pillow Orthopedic Sleeping Pillows, Ergonomic Cervical Pillow for Neck Pain - for Side Sleepers, Back and Stomach Sleepers, Free Pillowcase Included ( Firm & Queen)
Designed to support and cushion you neck and shoulders
J-Pillow Travel Pillow
AVOCADO GREEN PILLOW-Loveable non-toxic pillow has an adjustable fill, made from GOLS organic certified latex and GOTS organic certified kapok.
An all-natural, organic and vegan pillow with an adjustable loft to suit all sleeping positions
These are my favorite luxury sheet sets sold online:
Best Luxury SheetsIncludesSizesColours
Fitted sheet + two pillowcasesTwin to Cal KingSand, Slate, White, Light Grey, Blue
Brooklinen Luxe Core Sheet Set – Includes 1 Flat Sheet, 1 Fitted Sheet + 2 Pillowcases – 480 Thread Count Sateen Sheet Set – 100 Percent Long-Staple Cotton – Oeko-TEX Certified – Smoke – Twin
One flat sheet, one fitted sheet, and two pillowcases.Twin to Cal KingWhite, Cream, Steel, Smoke, Smoke Stripe
One flat sheet, one fitted sheet, and two pillowcases.Twin to Cal KingWhite, Ivory, Grey
Boll and Branch
Boll & Branch Luxury Fair Trade Long Staple Organic Cotton Sheet Set - Full, Natural
one fitted sheet, one flat sheet, and two pillowcases.Full, Queen, King, Cal King onlyWhite, Solid Natural, Striped White, Pewter
Best For Specific Needs Soft and Warm: Parachute’s Sateen sheets Most Luxurious: Brooklinen’s Linen sheets Organic Luxury Sheets:  Saatva Lofton Organic sheets Breathable/Cool: Percale sheets from Parachute or Brooklinen

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