UK Bed Sizes Explained: The Complete Guide from Single to Super King

How wide is a double bed? Is a king size bed longer than a double? And what's the difference between a UK and European mattress?

Choosing the right bed size might seem straightforward, but with so many different options available, it's surprisingly easy to get confused.

A bed described as a double in one country might be a completely different size in another. And even when you've chosen the correct mattress dimensions, there's no guarantee the bed frame will fit comfortably into your bedroom.

At Paul Antony Beds & Bedrooms, we believe that understanding bed sizes is one of the most important steps towards making a sensible purchase.

Whether you're furnishing a child's bedroom, upgrading your existing bed or planning a completely new bedroom, this guide explains everything you need to know about standard UK bed sizes.

UK Bed Sizes: Complete Measurement Chart

The following table shows the most commonly available standard UK mattress sizes.

These measurements refer to standard mattress dimensions.

Important: The overall dimensions of a bed frame may differ slightly.

Always check the manufacturer's measurements before purchasing.

What Size Is a Small Single Bed?

A standard UK small single mattress measures 75 cm wide by 190 cm long.

Sometimes described as a 2ft 6in bed, it's a useful option for bedrooms where floor space is limited.

Small singles are commonly considered for children's bedrooms, compact guest rooms and occasional sleeping arrangements.

Although they're the same length as standard single mattresses, they're 15 cm narrower.

That difference can be significant, particularly for adults who move frequently during the night.

If your bedroom has sufficient space, a standard single may provide better long-term flexibility.

What Size Is a Standard Single Bed?

A standard UK single mattress measures 90 cm wide by 190 cm long.

Single beds are popular for children, teenagers and adults who sleep alone.

They offer a practical balance between sleeping space and bedroom floor area.

A single bed can also be an effective option for a guest bedroom, especially where the room needs to accommodate other furniture.

Single beds are available in several styles, including divans, wooden bedsteads, metal frames and upholstered designs.

Some also incorporate drawers or ottoman storage, helping to make better use of limited space.

Is a Single Bed Suitable for an Adult?

For many adults, yes.

However, it's worth considering both width and length.

A standard UK single mattress is 190 cm long, which may not provide enough room for particularly tall sleepers.

In those circumstances, a longer mattress may be worth considering.

What Size Is a Small Double Bed?

A small double mattress measures 120 cm wide by 190 cm long.

It's also commonly known as a 4ft bed or three-quarter bed.

Small doubles provide an additional 30 cm of width compared with a standard single.

That makes them particularly appealing to people who sleep alone but prefer more room to stretch out.

Can Two People Sleep in a Small Double?

Yes, although space will be limited.

When shared equally, a small double provides approximately 60 cm of sleeping width per person.

That's considerably less than the 90 cm available to someone sleeping alone in a standard single.

For occasional use, a small double may be adequate for two adults.

However, couples sharing a bed every night may prefer a standard double or larger if space permits.

Who Should Consider a Small Double?

Small doubles can be particularly useful for teenagers, adults sleeping alone, smaller bedrooms and guest rooms.

They offer additional comfort without requiring as much floor space as a standard double.

What Size Is a Double Bed in the UK?

A standard UK double mattress measures 135 cm wide by 190 cm long.

That's approximately 4ft 6in wide and 6ft 3in long.

It's one of the most familiar mattress sizes in the UK and is widely used by couples and individuals wanting additional sleeping space.

Is a Double Bed Big Enough for Two Adults?

For many couples, a double bed provides sufficient space.

However, when two people share a double mattress, each has approximately 67.5 cm of width.

That is less personal sleeping space than a standard single mattress provides.

If you or your partner regularly move during the night, a larger bed may offer greater freedom of movement.

What Size Is a King Size Bed?

A standard UK king size mattress measures 150 cm wide by 200 cm long.

Compared with a standard double, it's 15 cm wider and 10 cm longer.

The additional length can be particularly useful for taller sleepers.

The extra width also gives couples more personal sleeping space.

Is a King Size Bed Worth It?

That depends on your bedroom dimensions and individual preferences.

A king size bed provides approximately 75 cm of width per person when shared equally.

Although the difference from a double might seem relatively small, those extra centimetres can make changing sleeping positions feel less restrictive.

However, a larger bed isn't necessarily the right choice for every bedroom.

Make sure there's sufficient room to move around comfortably and access wardrobes, drawers and other furniture.

What Size Is a Super King Bed?

A standard UK super king mattress measures 180 cm wide by 200 cm long.

That's 6ft wide and approximately 6ft 6in long.

It's 30 cm wider than a king and 45 cm wider than a standard double.

For couples, a super king provides approximately 90 cm of sleeping width per person.

That's equivalent to the width of a standard single mattress for each sleeper.

Who Should Consider a Super King?

Super king beds can be particularly appealing to couples who appreciate generous sleeping space.

They're also useful for people who move frequently during the night or prefer additional personal space.

However, the size of the bedroom should always be considered.

A super king may fit into a room physically but still leave insufficient space for furniture and movement.

Double, King and Super King: What's the Difference?

The main differences are width and, in the case of a double compared with a king, length.

The width-per-person figures assume two people sharing equally.

Choosing between these sizes isn't simply about buying the largest mattress available.

It's about finding the right balance between sleeping space, comfort, practicality and bedroom dimensions.

Keep an eye out for our upcoming post Double vs King vs Super King Comparison, it explores those differences in greater detail.

Are UK and European Bed Sizes the Same?

No.

This is particularly important when purchasing imported furniture or replacing a mattress on an existing bed frame.

European mattress dimensions often differ from standard UK measurements.

European sizes vary by manufacturer and country, so these are examples rather than universal equivalents.

A European double mattress measuring 140 × 200 cm will not necessarily fit a bed frame designed for a UK double mattress.

Always compare the actual measurements rather than relying on the size description.

Are Bed Frame Dimensions the Same as Mattress Dimensions?

Not always.

A mattress described as a standard double measures 135 × 190 cm, but the overall bed frame may be wider and longer.

For example, upholstered bed frames may have thick padded side rails, while sleigh beds can include substantial headboards and footboards.

Divan bases generally occupy a footprint closer to the mattress dimensions, although headboards and fittings can still add to the overall space required.

This distinction becomes particularly important when planning a bedroom with limited floor space.

Next up in the post is our Guide to Measuring Your Bedroom for a New Bed explains how to check dimensions properly.

Which Bed Size Should You Choose?

There's no single answer that suits everyone.

A small single may be ideal for a compact guest bedroom, while a standard single often works well for children and adults sleeping alone.

A small double provides additional room for one person without taking up the space of a standard double.

For couples, a double may be perfectly adequate, although a king or super king provides more personal sleeping space.

It's also worth considering mattress quality.

A larger mattress doesn't automatically provide better support or comfort.

Choosing a mattress that suits your sleeping preferences can be more important than simply increasing the size.

Frequently Asked Questions About UK Bed Sizes

How Wide Is a Double Bed?

A standard UK double mattress is 135 cm wide, approximately 4ft 6in.

Is a King Size Bed Longer Than a Double?

Yes. A UK king is 200 cm long, compared with 190 cm for a standard double.

Is a Super King the Same Length as a King?

Yes. Standard UK king and super king mattresses are both 200 cm long.

The difference is width.

What Is a Three-Quarter Bed?

A three-quarter bed usually refers to a small double, measuring 120 × 190 cm in the UK.

Is a Queen Size Bed the Same as a Small Double?

Some UK retailers use the term queen size for a small double.

However, queen size means something different in other countries, so always check the actual measurements.

Are Two Single Beds the Same Size as a Super King?

Not exactly.

Two standard UK single mattresses placed side by side measure 180 × 190 cm.

A standard UK super king measures 180 × 200 cm.

Specially sized split mattresses are available for certain super king configurations.

What Bed Size Is Best for a Tall Person?

A king or super king offers 200 cm of length, compared with 190 cm for a standard UK single or double.

Taller people may also wish to consider specialist longer mattresses.

Choosing the Right Bed Starts with the Right Measurements

Understanding UK bed sizes makes it easier to choose a bed that suits your room and sleeping preferences.

But dimensions are only part of the decision.

The type of mattress, the construction of the bed frame, available storage and the layout of your bedroom all deserve consideration.

At Paul Antony Beds & Bedrooms, we believe taking time to understand your options helps avoid expensive mistakes.

Before making a purchase, check the mattress measurements, confirm the external dimensions of the bed frame and think about how the bed will work alongside your existing furniture.

The best bed size isn't necessarily the biggest one. It's the one that provides the right combination of sleeping space, comfort and practicality for you.