A complete guide to mattress size dimensions

To help you select the appropriate mattress size, we’ve put together a guide to standard dimensions and which mattress can best suit your needs.

mattress dimensions
Mattress size Dimensions Minimum room size Best for Overview
76" x 80", 193 x 203.2 cm
12 x 12 feet
Two sleepers, with room to spare
Spacious and luxurious
72" x 84", 182.9 x 213.4 cm
12 x 12 feet
Two taller individuals
Slightly narrower than a regular king
60" x 80", 152.4 x 203.2 cm
9.5 x 10 feet
Single sleepers, couples, or even pets
More popular size
54" x 75", 137.2 x 190.5 cm
9 x 9.5 feet
Single sleepers or couples (being close)
Sometimes called a double
38" x 80", 96.5 x 203.2 cm
8 x 10 feet
Tall single sleepers
Five inches longer than the standard twin size
38" x 75", 96.5 x 190.5 cm
7 x 10 feet
Single sleepers
Smallest of all standard sizes

How to choose the right mattress size

When picking the right mattress, there is more to consider beyond its dimensions and minimum room size. Mattresses directly impact the quality of your sleep and should be considered an investment. Keep these factors in mind when shopping for a new mattress:

man and woman sleeping on bed

One of the most critical factors when picking a mattress size is who you are sharing the bed with. While a full mattress suits most couples, it may not suit couples with children or pets. A king mattress might be best if you share a bed with multiple people.

man sleeping in soldier position

Most beds are wide enough for at least one person but may not always be long enough. For example, a twin bed might be wide and long enough for an average-height sleeper but certainly won’t be able to accommodate someone over 6’5”.

comforter on a mattress

Your bed should leave enough space for the rest of your furniture. As a rule of thumb, you’ll want to leave at least two feet of free space on each side of your bed to ensure you can move around comfortably.Also, consider door and staircase width, as these factors can dictate how you maneuver your mattress.

When choosing your mattress size, consider how much space you need in bed. If you move around when you sleep, are a side sleeper, combination sleeper or just want extra space, a wider mattress might be a better choice for you.

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100-Night Trial

Your 100-night trial begins the day your mattress is delivered to your doorstep. If you decide it isn't a perfect fit for you within the first 100 nights, we'll have it picked up and issue a full refund. (Awesome, right?)

10-Year Warranty

If there's something wrong with your mattress, we'll replace it for up to 10 years, starting from the date of original purchase.

Free Shipping & Returns

Get your mattress shipped straight to you at no extra cost – with complimentary white-glove delivery available on select mattresses. If you don’t love your mattress, just contact a Sleep Genius to confirm eligibility and arrange a free return.

To be eligible for a return, you must be within the 100-night trial period and have had the mattress for at least 21 days; the mattress must also be clean and undamaged. You will be refunded the full mattress price minus the value of any discount, interest accrued, and/or shipping charges.

For questions about products purchased at a retail location, please contact the store directly.

Non-toxic materials

Our 100% nontoxic GelFlex Grid material is CleanAir GOLD and CertiPUR-US certified – as is our high-density polyurethane foam.

Find your perfect mattress

  • Purple Essential Collection
    Grid + Foam Base
  • Restore Hybrid Collection
    Grid + Coil Base
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    5-Star Value
    NewDay mattress exploded layers view
    4.6
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    PurpleFlex™ Mattress

    Firm support provides alignment

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    • Firm feel

    • 2” of GelFlex Grid instantly adapts as you move

    • 6” of Base Support Foam adds stability

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  • Best Seller
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    4.5
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    Purple Mattress®

    Added cushioning enhances comfort

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    Cooling
    Comfort
    Support
    • Medium firm feel

    • 2” of GelFlex Grid instantly adapts as you move

    • 4” of Base Support Foam adds stability 

    • 3.25” of Comfort Foam takes pressure off hips + shoulders 

    Starting at Is dollars Is now dollars
  • Extra Comfort
    Purple Plus mattress exploded layers view
    4.5
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    Purple Plus® Mattress

    Reduced motion transfer, better breathability

    Great Better Best
    Cooling
    Comfort
    Support
    • Medium feel

    • 2” of GelFlex Grid instantly adapts as you move

    • 7” of Base Support Foam reduces motion transfer 

    • 2” of Ultra Comfort Foam adds responsive comfort 

    • Upgraded comfort layer boosts breathability 

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  • No More Tossing & Turning
    Restore Mattress layers view
    4.5
    (5499)

    Purple Restore™ Hybrid Mattress

    Upgrade to the enhanced benefits of GelFlex®Grid with hybrid responsive pressure relief and cooling. 

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    Cooling
    Comfort
    Support
    • Available in soft or firm

    • 2” GelFlex® Grid instantly adapts as you move

    • Edge-to-Edge Coils increase responsive support

    • Up to 2X Cooler compared to leading competitors

    • Comfort Foam for added pressure relief

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  • Customer Favorite
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    4.6
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    Purple RestorePlus™ Hybrid Mattress

    Provides core body support plus extra comfort + cooling benefits, for uninterrupted sleep.

    Great Better Best Ultimate
    Cooling
    Comfort
    Support
    • Available in soft or firm

    • 3” GelFlex® Grid instantly adapts + boosts comfort

    • 3 Zone Edge-to-Edge Coils for core body support

    • Up to 3X Cooler compared to leading competitors

    • Ultra Comfort Foam enhances cradling + breathability

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  • #1 For Hot Sleepers
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    4.4
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    Purple RestorePremier™ Hybrid Mattress

    Sleep deeper with best-in-class cooling, superior pressure relief + aligning support for restorative sleep.

    Great Better Best Ultimate
    Cooling
    Comfort
    Support
    • Available in soft or firm

    • 3” GelFlex® Grid instantly adapts + boosts comfort

    • CoolFlex™ Coils for dynamic pin-point support

    • Up to 4X Cooler compared to leading competitors

    • Cradles your body’s contours for superior pressure relief

    • Ultra Comfort Foam enhances cradling + breathability

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Life-changing sleep, paid for at your own pace with as low as 0% APR financing.  

Get overall comfort with the right mattress

Choosing a mattress can be confusing, especially when facing many options. However, you can make the process easier by considering the size of your room, height, budget, and whether you plan to share a bed with someone else.

We’re here to help you find that just-right fit — take our Mattress Quiz for personalized recommendations based on your sleep habits.

Smiling man and woman in bed

Frequently Asked Questions

Measure a mattress from head to foot to get the length and side to side to get the width. Depending on your bed base, you may also need to measure a mattress’ depth before purchasing.

Yes, full mattresses are big enough for two people and are popular among couples. However, couples with specific sleeping preferences might benefit more from a queen or king mattress. Alternatively, you can get two twin XLs to create a split-king and use an adjustable frame.

Read our article to understand pros and cons: Full mattress vs Queen Mattress.

The current most popular mattress size is the queen, which can suit single sleepers and partners. Shopping for accessories like sheets and duvets is easy as well, as they are highly available.

Technically, you can use two twin XL mattresses on a split-king bed frame. This can benefit couples with different sleeping preferences and needs.

Also, consider king vs California king differences.

While a standard pillow size is often good enough for any sleeper, some pillows specifically suit queen and king mattresses. If you tend to toss and turn in your sleep, buying a larger pillow can also help enhance your sleep.

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Experience our industry-leading GelFlex® Grid in Mattress Firm, Ashley Furniture, Raymour & Flanigan, Mathis Home, Rooms To Go and other top retailers around the country.  

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