4ft6 Double Mattresses

4ft6 Double Mattresses: The Ultimate Buying Guide

A 4ft6 double mattress is the standard UK double mattress size and provides a versatile sleeping surface for couples as well as individuals who prefer additional room. Measuring approximately 4ft6 x 6ft3 (137cm x 190cm), it offers more width than a small double while taking up less bedroom space than a king size mattress.

Choosing the right double mattress isn't simply about finding the correct size. Firmness, spring construction, comfort fillings, mattress depth and the bed base underneath can all influence how the finished bed feels. Understanding these differences makes it much easier to compare mattresses beyond headline features such as spring count or mattress depth.

1. What Size Is a 4ft6 Double Mattress?

A standard UK double mattress measures approximately 4ft6 x 6ft3 (137cm x 190cm).

The 4ft6 measurement refers to the approximate width of the mattress rather than the external dimensions of the complete bed. A bed frame, divan headboard, side rails or footboard can all increase the overall dimensions, so use the full bed measurements when checking available bedroom space.

2. Is a 4ft6 Mattress a Standard Double?

Yes. In the UK, the terms 4ft6 mattress, double mattress and standard double mattress are commonly used to describe the same mattress size.

A double sits between a 4ft small double and a 5ft king size, making it a popular choice where you want comfortable sleeping space for two without the larger footprint of a king.

3. Who Is a 4ft6 Double Mattress Suitable For?

A standard double mattress can be a practical choice for:

• Couples looking for a standard UK double bed
• Single sleepers who prefer a generous sleeping area
• Guest bedrooms designed for one or two people
• Teenagers and young adults with sufficient bedroom space
• Double divan beds, bedsteads and ottoman beds
• Bedrooms where a king size mattress would take up too much floor space

4. Is a Double Mattress Big Enough for Two People?

Yes. A 4ft6 double mattress is designed to accommodate two adults and remains one of the most popular mattress sizes for couples.

However, the amount of personal sleeping space you prefer is individual. If you or your partner move frequently during the night or simply prefer more room, a king or super king can provide considerably more sleeping width where bedroom space allows.

5. Double vs Small Double Mattress

A 4ft Small Double Mattress measures approximately 4ft x 6ft3 (122cm x 190cm), while a standard double measures approximately 4ft6 x 6ft3 (137cm x 190cm).

Both are approximately the same length, but the standard double provides around 15cm of additional sleeping width. This can make a noticeable difference when two people regularly share the mattress.

6. Double vs King Size Mattress

A standard double measures approximately 4ft6 x 6ft3 (137cm x 190cm), while a 5ft King Size Mattress measures approximately 5ft x 6ft6 (153cm x 200cm).

A king therefore provides around 16cm of additional width and 10cm of extra length. The additional length can be particularly useful for taller sleepers, while the greater width provides couples with more individual sleeping space.

7. Understanding Double Mattress Firmness

Firmness describes how soft or firm a mattress feels when you lie on it. It shouldn't be confused with support, as a mattress can provide effective underlying support while still having a softer, more cushioned sleeping surface.

You can compare our Soft Mattresses, Medium Mattresses, Medium-Firm Mattresses and Firm Mattresses to explore different comfort levels.

Soft

A softer mattress provides greater cushioning and generally allows more initial sink into the upper comfort layers.

Medium

A medium mattress balances cushioning with a supportive sensation and can provide a versatile middle ground for sleepers who don't want either a particularly soft or firm surface.

Medium-Firm

A medium-firm mattress provides a more supportive sensation while retaining noticeable cushioning from its comfort layers.

Firm

A firm mattress provides a more solid sleeping surface with less initial sink and can suit sleepers who prefer a firmer sensation.

Firmness is subjective. Body weight, sleeping position, mattress construction and the bed base underneath can all influence how the same mattress feels to different people.

8. Firmness vs Support

A firmer mattress isn't automatically more supportive. Support comes primarily from the underlying spring or foam system, while the upper comfort layers have a significant influence on how soft or firm the sleeping surface feels.

For example, a pocket sprung mattress can have a substantial supporting spring system combined with softer upholstery, resulting in a cushioned sleeping surface with responsive underlying support.

9. Pocket Sprung Double Mattresses

Pocket Sprung Mattresses contain individual springs enclosed within separate fabric pockets. This allows different areas of the mattress to respond more independently to pressure than an interconnected spring system.

This can be particularly useful on a double mattress shared by two people because each side of the mattress can respond more independently to the individual sleeper.

Spring count shouldn't be considered in isolation. Spring construction, wire gauge, zoning, upholstery and the comfort layers above the springs all contribute to how the finished mattress feels and performs.

10. Open Coil Double Mattresses

Open coil mattresses use an interconnected spring system rather than individual pocket springs. It's a long-established mattress construction and can provide supportive comfort at an accessible price point.

Open coil double mattresses can be particularly useful for guest bedrooms and value-focused purchases, although comfort, firmness and construction vary between individual models.

11. Memory Foam Double Mattresses

Memory Foam Mattresses use pressure-responsive foam designed to contour around the body.

Some memory foam mattresses use foam throughout their construction, while others combine memory foam with springs. The depth and density of the foam, together with the support system underneath it, all contribute to the finished sleeping feel.

12. Hybrid Double Mattresses

Hybrid Mattresses combine different mattress technologies within one design, commonly pairing a spring support system with memory foam, gel foam or other specialist comfort materials.

This can provide the responsiveness of springs together with the cushioning and contouring characteristics associated with foam.

Hybrid mattresses vary considerably, so compare the actual spring system, comfort layers and firmness rather than assuming every hybrid will provide the same sleeping experience.

13. Cool Gel Double Mattresses

Cool Gel Mattresses incorporate gel or cooling technologies within their comfort layers, often alongside foam or pocket springs.

These materials are designed to provide cushioning while incorporating features intended to help manage sleeping temperature. The exact cooling technology varies between manufacturers, so compare the individual mattress specifications.

14. Natural Double Mattresses

Natural Mattresses can incorporate materials such as wool, cotton and other natural fibres within their upholstery.

These materials are often selected for their comfort and breathability and can be combined with pocket spring systems to create more traditionally upholstered mattresses.

The type and amount of natural filling varies considerably between models, so check the individual specification if natural content is particularly important to you.

15. Orthopaedic Double Mattresses

Orthopaedic Mattresses are commonly designed to provide a firmer, more supportive sleeping feel.

The term orthopaedic doesn't describe one particular spring system or filling. These mattresses can use different constructions, so consider the stated firmness and complete specification rather than choosing solely because a mattress is described as orthopaedic.

16. Rolled Double Mattresses

Rolled Mattresses are compressed and rolled for easier transportation and handling.

Being supplied rolled doesn't determine the firmness or quality of a mattress. Foam, sprung and hybrid constructions can all potentially be compressed depending on their design.

After unpacking, allow a rolled mattress to expand in accordance with the manufacturer's instructions.

17. Choosing a Double Mattress for Couples

When two people share a mattress, consider more than simply whether it is soft, medium or firm. Body weight, sleeping position, movement during the night and individual comfort preferences can all affect which mattress feels most comfortable.

Pocket sprung and hybrid mattresses can be particularly interesting for couples because individually pocketed springs allow different areas of the mattress to respond more independently.

If the two sleepers have very different comfort preferences, compare the complete construction carefully rather than simply choosing a firmness that appears to be the middle ground.

18. Motion Transfer When Sharing a Mattress

Movement across a mattress can be particularly noticeable when two people share a bed. If one sleeper changes position frequently, this movement can potentially disturb the other person.

Individually pocketed springs allow different areas of the mattress to react more independently, while some foam comfort layers can also absorb movement.

The amount of motion transfer varies according to the complete mattress construction rather than any single material.

19. Edge Support on a Double Mattress

Edge support can be particularly useful when two people share a standard double because it can help maximise the usable sleeping area.

Some mattresses incorporate reinforced perimeter springs, firmer foam borders or specialist edge-support systems designed to create a more stable sensation near the sides of the mattress.

Not every mattress has reinforced edge support, so check the individual product specification if this feature is important to you.

20. Double Mattresses for Guest Bedrooms

A 4ft6 double mattress is a versatile choice for a guest bedroom because it provides generous sleeping space for one person while also accommodating two guests when required.

Consider how frequently the guest bed will be used and the variety of sleepers likely to use it. A medium or medium-firm mattress can provide a versatile comfort choice, although there is no single firmness that suits everybody.

21. Double Mattress Depth

Double mattresses are available in many different depths depending on their construction.

A deeper mattress may contain substantial spring units or several comfort layers, but depth alone isn't an indication of quality. The materials inside the mattress and how they work together are more important.

Mattress depth also affects the finished height of your bed, particularly when combining a deep mattress with a tall divan base or bed frame.

22. Does the Bed Base Affect Mattress Feel?

Yes. The base underneath the mattress contributes to the overall feel of the finished bed.

A platform-top divan provides a stable, firm supporting surface and can make the mattress feel slightly firmer.

A sprung divan base introduces additional cushioning and responsiveness beneath the mattress.

Sprung slats provide some flexibility, while solid slats generally create a firmer supporting surface.

The same double mattress can therefore feel slightly different when used on different types of bed base.

23. Can I Use a Double Mattress on an Ottoman Bed?

Yes, provided the mattress is the correct size and compatible with the individual ottoman bed.

Mattress weight is particularly important because the gas-lift pistons are designed to operate with a suitable range of mattress weights. Deep pocket sprung and hybrid mattresses can be relatively heavy, so check the requirements of your chosen ottoman bed.

24. Check the Slat Spacing

If you're placing your double mattress on a slatted bed frame, check the mattress manufacturer's requirements for the maximum distance between the slats.

Gaps that are too wide may not provide suitable support for some foam and pocket sprung mattresses and could potentially affect mattress performance or warranty conditions.

25. Single-Sided vs Double-Sided Mattresses

A single-sided mattress has one sleeping surface and generally requires rotation from head to foot rather than turning over.

A double-sided mattress has two usable sleeping surfaces and can usually be turned as well as rotated.

Always follow the manufacturer's care instructions because maintenance requirements vary between individual mattresses.

26. Measuring for a Replacement Double Mattress

If you're replacing an existing mattress, measure the internal sleeping area of the bed rather than the outside of the bed frame.

A standard UK double mattress measures approximately 4ft6 x 6ft3 (137cm x 190cm).

If you have an older, imported or specialist bed, don't assume that it takes a standard UK double mattress. Check the required mattress dimensions before ordering.

27. Getting the Most from Your Double Mattress

Place your mattress on a suitable supportive base and follow the manufacturer's care instructions from the beginning.

A suitable mattress protector can help protect the sleeping surface from spills and everyday wear, while regular turning or rotation – where required – can help the mattress settle and wear more evenly.

When comparing double mattresses, consider the firmness, support system, comfort fillings and complete construction rather than relying on a single specification such as spring count, mattress depth or price.