Emperor Mattresses

What size is an emperor mattress?

An emperor mattress is the largest UK mattress size, measuring 6 ft 6 in by 6 ft 6 in (200 cm by 200 cm). It offers an impressive 6 inches of extra width compared to a super king mattress, giving two people plenty of space to stretch out and enjoy a comfortable, undisturbed night's sleep. According to our 2026 Sleep Survey, a quarter of UK bed-sharers say they sleep better when their partner isn't in the bed. Having a little extra space often solves more than people expect.

For more information about mattress sizes and how to choose the right one for you, check out our bed and mattress size guide or the home measuring guide.

What are the benefits of emperor mattresses?

One of the most significant benefits of an emperor mattress is the generous space it offers. This provides plenty of room for couples to sleep soundly without disturbing each other, reducing overheating and putting an end to those duvet tug-of-wars during the night. Emperor mattresses are spacious enough for little ones or pets to join you for cosy weekend lie-ins, without feeling cramped. Bringing luxurious, hotel-style comfort into your bedroom, they create a stunning focal point in larger spaces when paired with a stylish emperor frame.

What types of emperor mattresses are there?

Our luxury emperor-size mattresses include a selection from two leading brands, Tempur and Flaxby, each offering their own unique comfort and support benefits.

TEMPUR memory foam emperor mattresses

Crafted from visco-elastic materials, our Tempur Pro Air SmartCool emperor memory foam mattresses offer personalised support, premium cooling, and motion isolation for undisturbed sleep. Exclusive to Dreams and available in soft, medium, and firm comfort grades, they’re designed for truly rejuvenating rest.

Discover more benefits in our guide to memory foam mattresses.

Flaxby pocket spring emperor mattresses

Flaxby’s Master’s Guild emperor mattresses combine natural British materials like wool, hemp, flax, and cotton with responsive pocket springs and pressure-relieving pillow tops for breathable, tailored comfort. Designed with individually wrapped pocket springs, they evenly distribute weight, helping to reduce partner motion and supporting every sleeper.

What firmness grades do emperor mattresses come in?

The ideal comfort level for your emperor-size mattress depends on your individual needs and sleep position:

• Soft emperor mattresses: Best for side sleepers, these emperor mattresses gently cushion the shoulders and hips, reducing pressure and allowing the body to gently sink in.
• Medium emperor mattresses: Perfect for those who change positions throughout the night or couples with different sleep styles, these mattresses provide balanced support and comfort.
• Firm emperor mattresses: Providing firm support to keep the spine aligned and prevent the lower back from sinking too far, these emperor mattresses are ideal for back sleepers, helping to maintain healthy posture throughout the night.
• Very firm emperor mattresses: Well-suited to front and back sleepers, as well as heavier individuals, extra firm emperor mattresses help support spinal alignment and reduce pressure on the joints.

Can you help me recycle my old emperor mattress?

Absolutely! As part of our zero-to-landfill commitment, we’ll collect your old mattress from the room of your choice when we deliver your new emperor mattress and responsibly recycle it so nothing goes to waste. Just add the recycling service to your basket, and our team will take care of the rest.