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Split King MattressesChiropractor's Guide(2024)

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Do King Mattresses Come in Two Pieces? – Mattress Designer Explains

Purchasing a new mattress can be an overwhelming experience, especially when it comes to king-size mattresses. With so many options available, it can be challenging to determine what type of mattress is best for you and your partner. One common question that arises is whether king mattresses come in two pieces. The answer is yes, king mattresses do come in two pieces.

King mattresses can come in two pieces, especially in the US where they’re larger. These are called split king mattresses. However, in the EU, UK and Ireland king mattresses are smaller and typically don’t come in two pieces.

This article will explore split king mattresses, their benefits, and what to consider when purchasing one.

Split King Mattresses: An Overview


Split king mattresses consist of two separate mattresses, each measuring approximately 38 inches wide by 80 inches long, placed side by side to create a king-size sleeping surface. These mattresses are designed to accommodate adjustable bed bases, allowing for independent adjustments on each side of the bed.


  1. Customization: Split king mattresses offer a high level of customization, as each partner can choose a mattress with their preferred firmness level and materials.
  2. Motion isolation: The separate mattresses reduce motion transfer, providing a more undisturbed sleep for both partners.
  3. Compatibility with adjustable bases: Split king mattresses are specifically designed for use with adjustable bed bases, allowing for independent adjustments on each side of the bed.


  1. Cost: Split king mattresses can be more expensive than standard king mattresses due to the separate pieces and the need for specialized bedding and accessories.
  2. Bedding: Split king mattresses require separate fitted sheets for each half of the bed, and may require specialized flat sheets and other bedding accessories.

Standard King Mattresses: An Overview


Standard king mattresses are single-piece mattresses that measure approximately 76 inches wide by 80 inches long. They offer a spacious and comfortable sleeping surface suitable for couples or individuals who prefer more room while they sleep.

Why Consider a King Mattress?


King mattresses provide ample space for couples or individuals who prefer more room to stretch out while they sleep. The generous dimensions of a king mattress can significantly enhance comfort, especially for those who tend to toss and turn during the night.

Comfort for Couples

A king mattress allows couples to sleep comfortably without disturbing each other. The larger size ensures that both partners have enough space to move freely and find their preferred sleep position without encroaching on their partner’s space.


King mattresses are versatile and can accommodate various bed frame styles, including platform beds, sleigh beds, and four-poster beds. This flexibility allows you to choose the perfect bed frame to match your bedroom décor and personal preferences.


  1. Limited customization: Standard king mattresses don’t offer the same level of customization as split king mattresses, which could be a drawback for couples with differing sleep preferences.
  2. Motion transfer: With a single piece, motion transfer between partners may be more noticeable, potentially causing sleep disturbances.
  3. Transportation: Standard king mattresses can be challenging to move and maneuver, especially through tight spaces.

King Mattresses in Ireland and the UK

Sizing Differences

In Ireland and the UK, king-size mattresses differ in dimensions from those in the US. A standard king-size mattress in these regions measures 150 cm wide by 200 cm long (60 inches wide by 78 inches long), compared to the US king mattress, which measures 193 cm wide by 203 cm long (76 inches wide by 80 inches long). Additionally, a super king mattress, which is equivalent to the US California king, measures 180 cm wide by 200 cm long (72 inches wide by 78 inches long) in Ireland and the UK.

Purchasing Considerations

  1. Room size: Ensure that your bedroom has enough space to accommodate a king-size mattress and bed frame, along with any other furniture you have or plan to add.
  2. Bed frame compatibility: Verify that your chosen mattress is compatible with your bed frame or select a new bed frame that fits the mattress dimensions.
  3. Firmness level: Choose a mattress with the appropriate firmness level for your sleeping preferences and needs, taking into account factors such as body weight, sleep position, and any existing health conditions.
  4. Budget: Determine a budget for your mattress purchase and explore options within that range. Keep in mind that higher-priced mattresses may offer additional features or better materials, but there are also affordable options that provide excellent comfort and support.
  5. Warranty and trial period: Look for mattresses with a generous warranty and trial period, ensuring that you have time to test the mattress and can return or exchange it if it doesn’t meet your expectations.

Choosing Between Split and Standard King Mattresses

Personal Preferences

Consider your personal preferences and sleep needs when choosing between a split and standard king mattress. If you and your partner have different sleep preferences or require individualized adjustments, a split king may be the better option. On the other hand, if you prefer a seamless sleeping surface and don’t require the customization offered by a split king, a standard king mattress might be more suitable.

Mobility and Transportation

If you need to move or transport your mattress frequently, a split king mattress may be easier to handle, as the individual pieces are smaller and lighter. Standard king mattresses can be cumbersome and challenging to maneuver, especially in tight spaces or narrow staircases.

Bedding and Accessories

When choosing between a split and standard king mattress, consider the availability and cost of bedding and accessories. Standard king mattresses use regular king-size bedding, which is typically easier to find and more affordable than specialized split king bedding. However, if you prefer the customization and motion isolation of a split king mattress, investing in specialized bedding might be worth the additional cost.

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Video Guide

Frequently Asked Questions

  1. Can I use a split king mattress on a standard king bed frame? Yes, you can use a split king mattress on a standard king bed frame, as long as the frame is designed to accommodate split king mattresses.
  2. Do split king mattresses require special sheets? Split king mattresses require separate fitted sheets for each half of the bed, but a standard king-size flat sheet can still be used.
  3. Can I use a standard king mattress on an adjustable base? While some adjustable bases can accommodate standard king mattresses, it’s essential to check the compatibility before purchasing.
  4. Do split king mattresses feel different from standard king mattresses? The feel of a split king mattress can vary depending on the materials and firmness levels chosen for each half, but overall, the comfort should be similar to a standard king mattress.
  5. Are split king mattresses more expensive than standard king mattresses? Split king mattresses can be more expensive than standard king mattresses due to the separate pieces and the need for specialized bedding and accessories.


In conclusion, king mattresses can come in two pieces, known as split king mattresses, or as a single piece, known as standard king mattresses. Each type has its advantages and disadvantages, and the choice between them depends on your individual needs, preferences, and concerns related to mobility and bedding. By considering these factors, you can choose the right king mattress for a comfortable and satisfying sleep experience.

**As a service to our readers, Axial Chairs provides access to our library of archived content. Please note the date of the last review or update on all articles. No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinicians.

Medical Disclaimer: This website is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition.

Product Disclaimer: The seat cushion is designed by a chiropractor, but results may vary and are not guaranteed. The product is not intended to diagnose, treat, or cure any medical condition.

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Dr Lawrence Woods DC

Dr Lawrence Woods DC


My goal is to create the highest quality ergonomic office chairs and accessories for unmatched comfort.

With 30 years of spinal healthcare experience in Ireland as a chiropractor, I learned the value of high-quality sitting for living a happy and healthy life.

I have a Chiropractic Degree from Life Chiropractic College West and I am NBCE Physiotherapy certified.


About Me

The Spinery


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