Mattress Size Guide

Selecting the perfect mattress tailored to your unique sleep needs is an undeniably important decision for your bedroom. Join us as we journey into the realm of luxurious mattresses, where we bestow the knowledge you’ll need to make the best choice for you.

Selecting the perfect mattress tailored to your unique sleep needs is a crucial decision. A good night’s rest is essential for our emotional and physical well-being, and it starts with the foundation of your sleep environment - your mattress. Comfort is paramount, but it's also important to consider the sizes of beds and the various mattress dimensions available when choosing the best mattress for your bedroom.

Mattress dimensions vary, with different width and depth measurements depending on the size of the bed frame. Use our essential mattress measurements chart to guide you in finding the right size, then explore our handpicked collection of standard UK-size mattresses to discover your perfect fit.

The Art of the perfect fit: Your guide to UK mattress sizes

The size of the mattress you choose will be determined by your unique sleep preferences and the space you desire. In the UK, standard dimensions ensure consistent width and depth measurements for various bed sizes.

For a quick reference on UK bed sizes, use our convenient mattress measurements chart:

Bed/Mattress	Dimensions W x L (cm)	Dimensions W x L (feet)
SMALL SINGLE	75 x 190 cm	2’3" x 6’3"
SINGLE	90 x 190 cm	3'0" x 6’3"
SMALL DOUBLE	120 x 190 cm	4'0" x 6’3"
DOUBLE	135 x 190 cm	4’6" x 6’3"
KING	150 x 200 cm	5'0" x 6’6"
SUPER KING	180 x 200 cm	6'0" x 6’6"
EMPEROR	200 x 200 cm	6’6" x 6’6"

For personalised guidance on finding the ideal mattress for your sleep style, explore our expert guide to the best mattresses for every type of sleeper.

Selecting Your Perfect Mattress: A Guide to Restful Sleep

When choosing the right size mattress, let your personal preferences and circumstances guide you in making an informed decision that enhances your sleep sanctuary. External factors such as the space available in your bedroom should be taken into consideration along with more intimate influences such as sleeping habits, body measurements and whether you’re sleeping alone or with a partner.

Bespoke comfort starts here: A mattress sizing masterclass

The size of a small single bed and mattress

Small single bed dimensions are 75cm wide and 190cm long (2ft 6ins wide x 6ft 3ins long). These sizes are perfect for smaller bedrooms, offering an ideal transitional bed for growing children. Their space-saving dimensions also make them a sophisticated choice for occasional use in guest bedrooms.

Best for: Children or guest bedrooms

Explore our small single mattresses.

What size is a single mattress?

Standard single bed and mattress dimensions measure 90cm wide and 190cm long (3ft wide and 6ft 3ins long). Single-size beds are ideal for one person to sleep comfortably and are a popular choice for children's bedrooms, providing ample space as they grow into teenagers or for solo sleeping adults.

For those living alone, a low-maintenance, non-turn mattress such as the Bronte Mattress or the Noir Performance Hybrid Mattress is a practical and thoughtful choice. Both provide reliable comfort and support without the need for regular flipping, making them ideal for everyday ease and long-lasting rest.

Best for: One person

Explore our single mattresses and beds.

Small double bed (Queen Size) dimensions

Small double mattresses are 120cm wide and 190cm long (4ft wide and 6ft 3ins long) and often referred to as queen size. A small double mattress size is best suited to a single sleeper but can also accommodate two adults. However, for a more luxurious sleeping experience, we recommend a double mattress as the best bed size for two people.

Small double beds are best suited for Ottoman or Divan bed frames. Explore more space-saving bed frames in our guide.

Best for: One person, and ideal for small bedrooms

Explore our small double mattresses and beds.

The dimensions of a double mattress

Double mattresses are 135cm wide and 190cm long (4ft 6ins wide and 6ft 3ins long), providing ample room for one person to indulge or for two people to snuggle up comfortably. A double mattress size is perfect for maximising space in a mid-sized bedroom.

A double mattress is specifically designed for a double bed frame and should not be used on king, super king, or emperor beds.

Best for: Couples with small to average-sized bedrooms

Explore our double mattresses and beds.

King-size bed and mattress measurements

The standard dimensions of a king-size bed and mattress are 150 cm wide and 200cm long (5ft wide by 6ft 6in long), offering more length and width than a double mattress for added luxury. These generous king-size dimensions are perfect for couples who prioritise personal space, as it allows for unrestricted movement and fewer sleep disturbances. A king-size bed is also ideal for individuals over 6ft tall, providing ample space at the foot of the bed.

Best for: Two people desiring extra space and those taller than 190cm/over 6ft

Explore our king-size mattresses and beds.

The size dimensions of a super king bed and mattress

Super king mattresses and bed dimensions are 180cm wide and 200cm long (6ft wide by 6ft 6in in length), making them the perfect bed size for couples who enjoy the comfort and luxury of unrestricted movement in an abundance of space. The super king mattress dimensions also allow plenty of room for families with children who like to sneak in for a cuddle with their parents.

Given the extra width of a super king mattress and its bed frame, always ensure it fits comfortably in your bedroom space. For guidance on creating a harmonious space, explore our tips on Feng Shui bedroom design.

Best for: Two people who value extra space when they sleep and families who like to cuddle

Explore our super-king mattresses and beds.

What size is an emperor mattress?

An emperor mattress size is the biggest mattress size, measuring 200cm wide and 200 long (6ft 6in wide by 6ft 6in long). An emperor-size mattress offers an unrivalled amount of space, making it perfect for couples with large bedrooms who prefer to sleep in individual opulence. This mattress size is also ideal for homes with multiple children - or pets! - who love to climb into bed for a family-size snuggle.

Best for: Couples and families who enjoy indulgent space

Explore our emperor-size mattresses and beds.

Why mattress depth matters in the pursuit of comfort

While mattress size often leads the conversation, mattress depth is an equally important detail that can transform your sleep routine. More than just a measurement, depth influences comfort, support, and the visual balance of your bed within the room.

A deeper mattress, typically measuring 25 centimetres or more, often includes enhanced comfort features such as zoned pocket springs, pressure-relieving memory foam, or generous layers of natural fillings. These thoughtful details create a cocooning sensation that supports your body while offering a luxuriously soft and restorative sleeping experience.

Shallower mattresses, on the other hand, offer a more refined, contemporary profile. They are particularly well suited to lower bed frames and may appeal to those who favour a firmer feel or a more streamlined overall bed height.

When choosing your mattress depth, it is worth considering practical touches such as how your fitted sheets will sit, the overall height of your bed, and how easily you can get in and out of it each day.

For a clear and considered choice, explore our chart below to help you find the perfect fit:

Mattress Depth	Measurement	Overview	Ideal For:
Average depth	8-12 inches	Balanced and versatile, offering a refined level of comfort with a lighter overall profile.	Guest bedrooms, lighter sleepers, refined comfort on a smaller scale.
Deep	12-20 inches	Light and accessible. Higher profiles offer better comfort and longevity than slimmer styles.	Primary bedrooms, side sleepers, couples seeking elevated everyday luxury.
Extra Deep	20+ inches	Grand, cocooning and traditional in feel – with a more substantial profile.	Classic interiors, taller beds, those seeking maximum comfort and grandeur.
Pillow Top	Varies (An added top layer)	Adds height and comfort without the weight of a full, extra-deep mattress.	Those looking to soften a firm base or enhance the luxury of their current mattress.

Tailored comfort for two: The flexibility of zip & link mattresses

For couples with different sleep preferences, a zip & link mattress offers a tailored solution that combines individuality with shared comfort. Two mattresses are seamlessly joined to create one unified bed, maintaining the same dimensions as a standard double mattress while allowing each side to feature a different level of firmness. The result is personalised support for both sleepers, without compromise on style or cohesion.

This thoughtful design offers flexibility as well as comfort. Should your needs change, the mattresses can be easily separated and used in different rooms, making it a versatile choice that adapts beautifully to evolving spaces, all while upholding the quiet elegance of a well-considered bedroom.

UK vs. European bed sizes

Before choosing your mattress, it’s essential to know if your bed frame is a UK or European size. European mattress sizes tend to be slightly longer, and selecting the correct dimensions ensures a precise fit and preserves the elegant proportions of your bedroom.

UK & EU Mattress Sizes	UK Mattress Dimensions	EU Mattress Dimensions
Single	90 x 190 cm (3’0”x 6’3”)	90 x 200cm (3'0" x 6'6")
Double	135 x 190 cm (4’6” x 6’3”)	140 x 200cm (4'7" x 6'6")
King	150 x 200 cm (5’0” x 6’6”)	160 x 200cm (5'3" x 6'6")
Super/Grand King	180 x 200 cm (6’0” x 6’6”)	180 x 200cm (5'0" x 6'6")

Mattress sizing tips from our experts

At Feather & Black, we recognise that choosing a mattress is far more than a design decision, it’s an enduring investment in your sleep quality, comfort, and well-being. With this in mind, our expert buying team has curated trusted advice to help you select a mattress that perfectly supports your sleep needs.

Proportioned for comfort: Finding the right mattress length

“When selecting the best size mattress, you will need to take the body measurements of yourself and your sleep partner into consideration. To avoid anyone’s feet protruding at the foot of the bed, your mattress should be at least 10cm longer than the tallest person. For this reason, a king-size or larger is the best bed size for anyone measuring over 6ft.”

Comfort in every inch: Getting your mattress width correct

“For the utmost comfort, your mattress should be wide enough for you and your partner to lie side by side, with your hands behind heads, without your elbows touching. Whilst mattress width and length measurements remain consistent, mattress depths can vary, so this is another element to double-check when choosing the right mattress for you.”

The final details for achieving a good night’s sleep

“You should also remember to take the firmness of your mattress into account. This is a very personal choice, but the right level of firmness will ensure your body is evenly supported and your spine is kept perfectly aligned without any pressure being placed upon you. You can find more advice on this in our Mattress Firmness Guide.”

Ensure your mattress fits perfectly before you buy

“In addition to the size of your bedroom, it’s also important to consider the space you have available to manoeuvre around your home. Whilst your chosen mattress may fit perfectly in your bedroom, you need to be sure that it will pass through the lowest and narrowest restrictions in your house to get there. Check the dimensions of the doorways, the clearance on your stairs, and remove any obstructions along the route, such as floor lamps and wall art. You can find more in-depth advice on avoiding unexpected issues when your mattress arrives in our guide.”

Elevate your sleep with a mattress crafted for comfort and elegance

Armed with all the information you need on how to choose the right size mattress, including our essential mattress measurements chart, you can now begin the search for the mattress that is best for you.

Explore our expertly curated collection of blissfully comfortable, perfectly supportive and reassuringly durable mattresses to ensure you lay the foundations for sound sleep and enjoy rejuvenated mornings for years to come.