The Ultimate Guide to UK Bed & Mattress Sizes: Find Your Perfect Fit from All Size Beds

Choosing the right bed and mattress size is one of the most important decisions for your home. At All Size Beds, we know that in the UK, we use a specific set of standard dimensions that differ from European (IKEA) and US sizes. Whether you’re furnishing a tiny box room or a grand master suite, this guide will help you navigate the measurements to find your perfect match.

UK Standard Bed & Mattress Size Chart

In the UK, bed sizes are determined by the size of the mattress they hold. Note that the bed frame itself will often be slightly larger than the mattress to account for the headboard and side rails. At All Size Beds, we provide exact dimensions for all our frames to ensure a perfect fit in your room.

Bed Size	Metric (Width x Length)	Imperial (Width x Length)	Best For...
Small Single	75cm x 190cm	2'6" x 6'3"	Toddlers, small guest rooms
Single	90cm x 190cm	3'0" x 6'3"	Children, teens, solo adults
Small Double	120cm x 190cm	4'0" x 6'3"	Solo sleepers wanting space, "cosy" couples
Double	135cm x 190cm	4'6" x 6'3"	Couples in standard rooms
King Size	150cm x 200cm	5'0" x 6'6"	Couples, taller sleepers (over 6ft)
Super King	180cm x 200cm	6'0" x 6'6"	Families, maximum personal space
Emperor	200cm x 200cm	6'6" x 6'6"	Pure luxury, giant master bedrooms

A Closer Look at Each Size

1. Single & Small Single

The Small Single (2'6") is perfect for saving space in box rooms or for children graduating from a cot. The Standard Single (3'0") is the most popular choice for kids and guest beds.

• Pro Tip from All Size Beds: If you have a guest room that doubles as an office, consider a daybed which uses a standard single mattress but functions as a sofa during the day.

2. Small Double (The "Queen" or "Three-Quarter")

Often called a Queen or 4-foot bed in the UK, the Small Double is the ultimate "middle ground." It is wider than a single but narrower than a standard double.

• Ideal for: Teenagers who want more room to stretch or adults in studio apartments. It can fit two adults, but it’s a very tight squeeze. All Size Beds recommends this size for guest rooms where space is at a premium.

3. Standard Double

The Double (4'6") is the most common bed size in the UK. It fits comfortably in most Victorian or modern terrace houses.

• The Reality Check: While it's the "standard" for couples, it only gives each person about 67.5cm of space—which is actually less than a baby has in a standard cot!

4. King Size

The King (5'0") is the gold standard for master bedrooms. Crucially, it is 10cm longer (200cm) than a double, making it essential for anyone over 6 feet tall so their feet don't dangle off the end.

5. Super King

The Super King (6'0") is exactly the width of two single beds pushed together. It is perfect if you have young children who like to jump in on Sunday mornings or if you simply value undisturbed sleep.
Check out the All Size Beds luxury range for the ultimate Super King experience.

UK vs. European (IKEA) Sizes

A common pitfall for UK shoppers is buying a bed from a European retailer (like IKEA) and a mattress from a UK brand.

• EU Single: 90cm x 200cm (Longer than UK)

• EU Double: 140cm x 200cm (Wider and longer than UK)

• EU King: 160cm x 200cm (Wider and longer than UK)

Always check the measurements in cm before you buy to avoid "The Gap" at the end of your bed frame. At All Size Beds, we specify if a product follows UK or EU standards.

How to Choose the Right Size for Your Room

1. The 60cm Rule

To move comfortably around your bedroom, you should aim for at least 60cm (approx. 2 feet) of walking space around the sides and foot of the bed. This ensures you can open wardrobe doors and drawers without obstruction.

Top-down view showing the 60cm clearance needed for a functional bedroom.

2. Measure the Access

It’s not just about the room; it’s about the journey.

• Can a Super King mattress fit around your banister?

• Will a King-size headboard fit through your bedroom door?

• Solution: If access is tight, All Size Beds offers "Zip and Link" mattresses (two singles that zip together) or "Bed in a Box" memory foam mattresses that arrive compressed.

3. Consider Your Height

If you are 190cm (6'2") or taller, you should avoid Double and Single beds. The 200cm length of a King or Super King is necessary for a comfortable night’s sleep.

Summary Table: Which Size Do You Need?

Who is it for?	Recommended Size
Toddler/Small Child	Small Single or Single
Adult Solo Sleeper	Single or Small Double
Couples (Limited Space)	Double
Couples (Standard Comfort)	King Size
Couples + Kids/Pets	Super King
Taller Sleepers (6ft+)	King Size or larger

Finding the perfect bed is an investment in your health. Take your time, measure twice, and let All Size Beds help you ensure you have enough "starfish room" to wake up feeling refreshed every morning.