Mattress Sizes Explained

Choosing the right mattress size is essential for a great night's sleep. Below you'll find all standard UK mattress sizes in both metric and imperial measurements.

UK Mattress Size Guide

Size Name Metric (cm) Imperial (ft & in)
Small Single 75 x 190 cm 2ft 6in x 6ft 3in
Single 90 x 190 cm 3ft x 6ft 3in
Small Double (Queen) 120 x 190 cm 4ft x 6ft 3in
Double 135 x 190 cm 4ft 6in x 6ft 3in
King 150 x 200 cm 5ft x 6ft 6in
Super King 180 x 200 cm 6ft x 6ft 6in

Which Size Is Right for Me?

Child on a single bed

Single (3ft x 6ft 3in)

The classic choice for children, teenagers, guest rooms, and smaller rooms where space is at a premium. Compact yet comfortable, it's a versatile size that works beautifully in any room that needs to make the most of its space.
Woman on a small double bed

Small Double (4ft x 6ft 3in)

Great for one person wanting more space, the small double is ideal for smaller bedrooms and occasional couples. It gives you that extra room to stretch out without taking over the space.
Couple on a double bed

Double (4ft 6in x 6ft 3in)

The most popular size in the UK. A comfortable choice for couples and individuals who like plenty of room to spread out. Fits well in most standard bedrooms.
Couple on a king size bed

King (5ft x 6ft 6in)

Ideal for couples wanting extra width and taller sleepers who benefit from the extra length. A real upgrade in comfort and space.
Couple on a super king bed

Super King (6ft x 6ft 6in)

The ultimate in luxury space. If you have the room, a super king is perfect for couples who want maximum comfort and space to truly spread out.

Things to Consider When Choosing a Size

  • Room size: Allow at least 60cm of clearance around the bed for comfortable movement.
  • Sleeper height: Taller sleepers may benefit from a longer mattress (200cm).
  • Sharing: Couples generally sleep better on a King or Super King for more personal space.
  • Existing bed frame: Always measure your bed frame before purchasing a new mattress.

Understanding Mattress Height (Depth)

Mattress height — also referred to as depth or profile — is just as important as the width and length. It affects comfort, the look of your bed, and how well it works with your bed frame and bedding.

Common Mattress Height Categories

Profile Height Best For
Low Profile Up to 15 cm Bunk beds, cabin beds, or low-slung bed frames
Standard 16 – 25 cm Most bed frames; a good all-round choice
Deep 26 – 35 cm Divan bases; extra comfort and support layers
Extra Deep 36 cm+ Luxury mattresses with multiple comfort layers

Things to Consider with Mattress Height

  • Bed frame compatibility: Check the internal depth of your bed frame or divan base — a mattress that's too deep may sit too high or not fit properly.
  • Getting in and out of bed: A higher mattress can be easier for people with mobility issues, while a lower profile may suit children or those who prefer a closer-to-the-floor feel.
  • Bedding fit: Deeper mattresses require deep-fill fitted sheets (usually 30–40 cm). Always check the pocket depth before buying bedding.
  • Comfort layers: Generally, a deeper mattress means more layers of comfort fillings — which can mean a more luxurious feel, but it's not always the case. Focus on the materials and construction too.

Will It Fit Up the Stairs?

Getting a mattress upstairs is something we deal with every day, and we're here to make it as straightforward as possible. Our team will carry your mattress upstairs and remove all packaging — so you don't have to worry about a thing.

What You Need to Know

  • We carry it up for you: Our delivery team will bring your mattress upstairs and remove all packaging, leaving you with nothing to do.
  • We don't bend mattresses: To protect the integrity of the mattress, we will not bend or fold them during delivery. This means staircase clearance is important — particularly the height clearance on any turns or landings.
  • Height clearance is key: Please check the height clearance on your staircase, especially around any bends or low ceilings. A mattress carried upright needs enough vertical space to manoeuvre safely.
  • If in doubt, we'll come and have a look: We'd always rather visit and assess your staircase before delivery than risk any issues on the day. It's no trouble at all.

Free Home Site Visit

Not sure if your mattress will make it upstairs? We offer a free site visit — one of our team will come to your home, check your staircase access, and give you honest advice before you commit to a purchase. We'd much rather come and have a look than leave you with any uncertainty.

Get in touch to book your free site visit — we're happy to help.

Find Out More

Free Delivery & Disposal — find out more about our free delivery service and how we dispose of your old mattress responsibly.

Contact Us / Visit Our Showrooms — come and see us in King's Lynn or Wisbech, or get in touch with our friendly team for expert advice.