King size mattresses

Go big and sleep comfortably with Serta’s selection of King-sized mattresses. Approximately 16 inches wider than the Queen makes the King ideal for couples who like their own space or have extra visitors climbing into bed at night with them. Perfect for large or master bedrooms.

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Perfect Sleeper Hybrid Mattress

Serta Perfect Sleeper hybrid firm mattress on beige bed||feel: firm||level: enhanced Serta Perfect Sleeper hybrid plush mattress on beige bed||feel: plush||level: enhanced

  • Colors

Mattress

  • Sizes

  • Twin
  • Twin XL
  • Full

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Perfect Sleeper Innerspring Mattress

Serta Perfect Sleeper firm mattress in bedroom on beige bed||feel: firm||level: standard Serta Perfect Sleeper plush mattress in bedroom on beige bed||feel: plush||level: standard

  • Colors

Mattress

  • Sizes

  • Twin

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Serta Classic Mattress

Serta classic dorian firm mattress sitting in a beige bed frame ||feel: firm||level: standard Serta classic brecon firm mattress sitting in a beige bed frame ||feel: firm ||level: enhanced

  • Colors

Mattress

  • Sizes

  • Twin
  • Twin XL

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Serta iComfort Mattress

iComfort Elana Firm Mattress sitting in a brown bedframe || feel: firm || level: Standard - 11.5" iComfort Aspire Medium Mattress sitting in a brown bedframe || feel: medium || level: Enhanced - 14"

  • Colors

Mattress

  • Sizes

  • Twin XL
  • Full

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Serta iComfortPro Mattress

iComfortPro Granby Extra Firm Mattress sitting in a brown bedframe || feel: extra firm || level: Level 1 iComfortPro Chelsea Medium Mattress sitting in a brown bedframe || feel: medium || level: Level 1

  • Colors

Mattress

  • Sizes

  • Twin XL
  • Queen

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Serta iSeries Hybrid

A wooden bed with a Serta iSeries firm blue mattress, 2 beige pillows on top of it||feel: firm||level: enhanced A wooden bed with a Serta iSeries medium blue mattress, blue and beige pillows||feel: medium||level: standard

  • Colors

Mattress

  • Sizes

  • Twin
  • Twin XL
  • Full

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Serta Perfect Sleeper Pro Mattress

Perfect Sleeper Pro Hampton Extra Firm mattress sitting in a brown bedframe || level: Level 1 || feel: Extra Firm Perfect Sleeper Pro Kensington Medium mattress sitting in a brown bedframe || Level: Level 1 || Feel: Medium

  • Colors

Mattress

  • Sizes

  • Twin XL
  • Queen

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Serta Perfect Sleeper X Hybrid Mattress

Perfect Sleeper X Hybrid Aspen Firm Mattress sitting in a brown bedframe || feel: firm || level: Level 1 Perfect Sleeper X Hybrid Kendall Medium Mattress sitting in a brown bedframe || feel: medium || level: Level 1

  • Colors

Mattress

  • Sizes

  • Twin XL
  • Full

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Serta Perfect Sleeper X Quilted Hybrid Mattress

Perfect Sleeper X Quilted Hybrid Excelled Extra Firm Mattress sitting in a brown bedframe || feel: Extra Firm || level: Level 1 Perfect Sleeper X Quilted Hybrid Knox Firm Mattress sitting in a brown bedframe || feel: Firm || level: Level 1

  • Colors

Mattress

  • Sizes

  • Twin XL
  • Full

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Perfect Sleeper Sleep Excellence

The Serta Perfect Sleeper Sleep Excellence mattress in a bedroom on a white bed | feel: Extra Firm The Serta Perfect Sleeper Sleep Excellence mattress in a bedroom on a white bed | feel: Firm

  • Colors

Mattress

  • Sizes

  • Twin
  • Twin XL
  • Full

Size

  • Twin (28)
  • Twin XL (51)
  • Full (16)
  • Queen (5)

Product type

  • Mattress (10)

King mattress frequently asked questions

What size is a King size mattress?

Approx. Dimensions: 76” X 79.5” / 6,042 sq in / 42 sq ft

A King-size is the widest offering at 76 inches. A Queen is 60 inches wide and a California King is 72 inches wide.

Want to learn more about the different sizes we offer, check out our mattress size guide.

King vs California King. What's the difference between the two?

The measurements of a regular King are approximately 76 inches in width and 79.5 inches in length. The measurements of a California King are a bit longer and not as wide, the dimensions are approximately 72 inches wide by 83.5 inches long.

King Size Dimensions: 76″ Wide x 79.5″ Long

California King Size Dimensions: 72″ Wide x 83.5″ Long

Read more about the King vs California King differences, here.

Do two Twins make a King?
Actually, no they don’t. Two Twins put together fall approximately 5 inches short, but two Twin XLs put together are the same dimensions as a King.
What is a Split King?
A Split King is made up of two Twin XLs and measures the same as a standard King size but are generally bought for split adjustable bed frames or couples who have different sleep preferences and would like two different types of surfaces to sleep on.
How much is a good King size mattress going to cost?
A good King on average can range anywhere from $800 upwards to $5,000 depending on the features and materials used to make it.
Should I buy a King sized mattress in-store or online?
It’s all about your own personal shopping preference. Some people are online shoppers and that is what they are most comfortable with while others are more of an in-person shopper where touching, feeling and seeing the product is the only way they want to shop. So it really is all about which way you prefer to shop. There really is no right or wrong way to shop for a new bed. If you are, however, the latter, click here to find a Serta store near you.
Does Serta offer any customization options on Kings?
From innerspring to memory foam to mattress-in-a-box to hybrid mattresses, Serta offers different models that are available in King. Most have different cooling and firmness level options. So no matter your sleep preference and preferred sleeping position, back, stomach and side sleepers alike, Serta has a model that will be perfect for you.
Do you ship internationally?
On our website, we ship exclusively within the contiguous United States (lower 48 states). Unfortunately, we do not currently offer shipping to Alaska or Hawaii.
Do you offer financing?

Financing is available directly through our website. We have partnered with Affirm to offer financing or pay-over-time options for our customers. At checkout, you will be given the option to pay through Affirm. If approved, you will be given loan options for 3, 6, or 12 months. All interest is provided up front, there are no hidden fees, and only a soft credit check is done through Affirm's system for approval. After you've confirmed your choice, you will be redirected back to our website to complete checkout.

Affirm only requests a soft credit check for approval, so the credit inquiry won’t affect your credit score. Once you've selected your financing term, you will be redirected back to the website to complete your purchase.

For returns and cancellations, refunds will be processed through Affirm and posted to your Affirm account. Refunds will be processed within 3-10 business days. Keep in mind the interest charge will not be refunded.

Please note that financing through Affirm is not available in West Virginia and Iowa.

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SHOP WITH CONFIDENCE

Buy online from a mattress company you trust

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120-day trial

If you’re not completely satisfied, you can exchange or return it for a refund.

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Free shipping and returns

All products ship free and feature free returns when you order directly from Serta.com.

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10-year limited warranty

You should be able to rely on the quality of your rest. That’s why every Serta® bed is backed by our hassle free warranty.

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Monthly financing with Affirm

Quick, simple financing options with Affirm. Apply at checkout.

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SHOPPING YOUR WAY

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Want to test out and feel our products before you buy? Our Sleep Ambassadors will offer you a personalized, no-pressure in-store experience. Visit a store near you today.

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