King Size Mattress

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King Size Mattress

King Size Mattresses at Ashley

When you’re shopping for a king-size mattress, talk with the experts at Ashley! We carry a wide selection of king mattresses to suit different sleeping positions and needs. Whether you want the added comfort of a pillow top, firmness to support your neck and spine, or hypoallergenic materials, we have the brands and styles to grant you a restful night’s sleep.

King Mattress Dimensions

A king mattress size is typically 76 inches wide and 80 inches long (at least in the United States). The thickness can vary from 8 to 14 inches, depending on the features and manufacturer. A king mattress fits best in a large room, so it doesn’t appear cramped.

California king mattresses are a slightly longer option if you or your partner is taller than average or if you prefer more legroom. These measure 72 inches wide by 84 inches long, so they’re slightly narrower than the standard king mattress size.

If the narrower measurement concerns you, look for a split California king mattress, which is 76 inches wide. Much like placing two twin XL mattresses side by side, a split mattress provides varying firmness on each side of the bed — a compromise for couples with varying preferences and positions. The added width also reduces the likelihood of feeling the other person toss or turn during the night.

What Brands Offer King Mattresses?

All major mattress manufacturers carry king mattresses. At Ashley, you’ll find top-name brands such as Sealy mattresses, along with Purple Mattress, Beautyrest, Stearns & Foster, Tempur-Pedic, GhostBed, Chime, Scott Living by Restonic, Serta, and our own rigorously tested Ashley Sleep line.

We’re proud to offer such a variety so customers can find a mattress they want within their budget. The average price of a king-size mattress varies depending on materials and features. A memory foam mattress that provides good support and pressure relief can cost as low as about $400. A hybrid mattress that combines innerspring coils with memory foam to relieve pressure points with a breathable feel might run about $1,000 to $1,400. A luxury king mattress, such as one with high-quality materials, more coil layers for bounce and support, and other features, can cost more than $2,000.

While the price might give some people pause, consider that the average life of a king-size mattress is about seven to 10 years. Latex and high-density memory foams or polyfoam mattresses tend to last the longest while traditional innerspring beds last roughly five to six years. Some brands offer a 10-year warranty on material and manufacturing defects, while others have a trial period of 30 nights or more to test whether your new mattress inspires sweet dreams.

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For additional details on the offers on this page, click here to learn more.

0% interest for 72 months‡‡ - In-store Only 
On in-store purchases made with your Ashley Advantage® Synchrony credit card at participating locations from 4/29/2025-6/2/2025. Equal monthly payments required for 72 months. Minimum purchase may be required. Down payment up to 30% may be required on another payment type for in-store purchases. Promo fee of 2% of amount financed will be included in required monthly payments.   

‡‡Not combinable with other offers and discounts. If any down payment is required, the qualifying purchase amount is determined prior to any down payment, taxes or delivery. See a sales associate for details on required down payment. Qualifying purchase amount must be on one receipt. A promo fee, equal to 2% of the amount financed at time of purchase, will be shown as a separate transaction on your billing statement and included in the balance subject to this promo. Any taxes, delivery, or other charges included in the amount financed will increase the related promo fee and the required monthly payments. For example, a $950 purchase with $50 in taxes and shipping costs, will be charged a promo fee equal to $20 and $1,020 will be charged to your account. No interest will be charged on amount financed (including related promo fee) and equal monthly payments are required on promo purchase until it is paid in full. The payments equal the initial amount financed, (including related promo fee) divided by the number of months in the promo period, rounded up to the next cent. Any estimated monthly payments may be shown as rounded up to the next whole dollar (for ease of display) or may be shown rounded up to the next cent. See your billing statement for your actual required equal monthly payment, which will be rounded up to the next cent. These payments may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months' rounding. Regular account terms apply to non-promo purchases. New Accounts: As of 7/16/2024 Purchase APR is 34.99%. Penalty APR is 39.99%. Minimum Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.  

24 Months Special Financing‡* - Online Only 
On online purchases of $999 or more made with your Ashley Advantage® Synchrony credit card. Interest will be charged to your account from the purchase date if the promotional balance is not paid in full within 24 Months. Minimum monthly payments required.   

‡*Qualifying purchase amount must be on one receipt. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 07/16/24: Purchase APR 34.99%. Penalty APR 39.99%. Min Interest Charge $2. A promo fee will be charged equal to 2% of the amount financed on an equal payment no interest promotion of 18 months or more. Existing cardholders: See your credit card agreement terms. Subject to credit approval. 

$1 to Start‡^ 
‡^“$1 to start” is available for applications online and in select stores, does not include taxes, & refers to the rental period from agreement start date to 1st scheduled renewal payment. On 1st renewal date, regular rental rates, taxes & fees will apply. Rate, term and total cost vary by item selected. This is not a promotion for a specific transaction/item nor an offer for a loan, credit, or financing. See lease for payment amounts & rental terms. Offer will not reduce the number of payments, total amount to acquire ownership, or purchase option amount. Customers in California will pay a $0 initial rent payment and a $1 processing fee to start. 

Shop without using credit5 
5Acima offers lease-to-own transactions. “Shop Without Using Credit” means this is not a loan, credit, or financing. Acima obtains information from consumer reporting agencies during a lease application. We consider multiple data points and regularly approve customers with less than perfect credit history. Acima Cash Price may include a markup over invoice price. Acquiring ownership by leasing costs more than the retailer’s cash price. Not available in MN, NJ, WI, or WY. Not all applicants are approved.