Choosing the correct mattress size is essential to ensure comfort, space efficiency, and restful sleep. Among all available options, the double mattress is one of the most popular in the UK due to its balanced dimensions large enough for two sleepers yet compact enough for smaller rooms.

In this guide, we’ll explore the measurements of a double mattress, compare it with other common UK bed sizes, and help you determine whether a double bed is the ideal fit for your needs.

Understanding UK Mattress and Bed Size Standards

The UK has specific standard dimensions for mattresses, which differ slightly from those in the US and EU. These measurements are generally expressed in both centimetres and feet/inches. It is important to distinguish between mattress size and bed frame size, as frames often extend beyond the mattress with added structure or design.

Why Mattress Size Matters

Selecting the right mattress size impacts more than just how a bed fits in your room. It also influences sleep quality, especially for couples or individuals who move during the night. The goal is to allow sufficient personal space without overcrowding the bedroom.

Standard Double Bed Size in the UK

What Is a Double Mattress?

A standard double mattress in the UK measures 135 cm wide and 190 cm long, which is equivalent to 4 feet 6 inches wide by 6 feet 3 inches long. This size is suitable for single sleepers who prefer extra space or couples who do not require a larger mattress.

Key Dimensions of a Double Bed:

• Width: 135 cm (4’6”)
  

• Length: 190 cm (6’3”)
  

• Surface Area: 25,650 cm² (2.57 m²)
  

This size balances comfort and practicality, making it a frequent choice for guest rooms, teenagers, and smaller master bedrooms.

Comparing a Double Mattress with Other UK Sizes

Understanding how a double mattress compares with other popular bed sizes can help you decide what suits your sleeping habits and available space.

Small Double Bed

• Dimensions: 120 cm x 190 cm (4’ x 6’3”)
  

• Best for: Single adults or teenagers needing more space than a single bed but limited by room size
  

A small double is narrower than a standard double and may feel tight for two people.

King Size Bed

• Dimensions: 150 cm x 200 cm (5’ x 6’6”)
  

• Best for: Couples who need more personal space or taller individuals
  

A king size bed is 15 cm wider and 10 cm longer than a standard double, providing more comfort but requiring additional floor space.

Super King Bed

• Dimensions: 180 cm x 200 cm (6’ x 6’6”)
  

• Best for: Spacious master bedrooms, families co-sleeping with children, or couples wanting the most room
  

The super king offers maximum sleeping area but may not fit comfortably in every room.

Factors to Consider Before Choosing a Double Mattress

Room Size

The most important consideration is whether your room can accommodate a double bed without feeling cramped. Ideally, leave at least 60 cm of clearance around the bed to move comfortably.

Number of Sleepers

While a double bed fits two adults, the sleeping area per person is narrower than that of a king or super king. Couples who sleep close or don’t move much during the night may find a double mattress sufficient.

Sleeping Position and Body Size

Taller individuals or those who sleep sprawled may benefit from a longer or wider mattress. A king size might be a better choice if either sleeper exceeds six feet in height.

Bed Base Compatibility

Make sure the mattress size matches your bed frame. A mismatch can lead to discomfort or damage to the mattress edges over time.

How to Measure Your Bedroom for a Double Bed

Step 1: Measure Available Floor Space

Use a measuring tape to determine the exact dimensions of your room. Pay attention to alcoves, radiators, doors, and windows.

Step 2: Consider Surrounding Furniture

Account for wardrobes, bedside tables, and drawers. A double bed may dominate a small room, so layout planning is essential.

Step 3: Use Masking Tape or a Bed Template

Outline the dimensions of a standard double bed on your floor to visualise how it fits and how much space remains for movement and storage.

Who Should Choose a Double Mattress?

Teenagers and Young Adults

Double beds are often ideal for growing teens and students who need more space than a single mattress offers.

Single Adults

Many single sleepers prefer the extra room of a double bed without upgrading to a larger size, which might feel excessive.

Couples with Limited Bedroom Space

For partners living in flats or compact homes, a double mattress provides shared sleeping space without crowding the room.

Additional Tips for Buying a Double Mattress

Mattress Thickness and Comfort Layers

The comfort of a mattress isn’t just in its dimensions. Consider factors like firmness level, material composition (memory foam, pocket springs, hybrid), and thickness — typically ranging from 20 to 30 cm.

Bedding and Sheet Compatibility

Standard double bedding is widely available and more affordable than king or super king sizes. Ensure your fitted sheets, duvets, and mattress protectors match the 135 x 190 cm dimensions.

Trial Period and Warranty

Check if the mattress comes with a sleep trial and warranty period. This provides reassurance that you can exchange it if the size or feel doesn’t meet your expectations.

Conclusion

In summary, a double mattress in the UK measures 135 cm x 190 cm and provides a versatile balance of space and efficiency. It’s well-suited for single adults, couples with limited space, or as a guest room staple. When selecting the ideal mattress, always consider your room layout, body size, sleep preferences, and whether you'll be sharing the bed. Understanding how it compares with king size bed dimensions in the UK ensures that your purchase aligns with both your comfort and your spatial requirements.

FAQs

What size is a standard double bed in feet and inches?

A standard double bed in the UK measures 4 feet 6 inches wide and 6 feet 3 inches long. In centimetres, that’s 135 cm by 190 cm.

Is a double mattress big enough for two people?

Yes, a double mattress can accommodate two adults, though it offers less space per person compared to a king size bed. It is best suited for couples who don’t need a large sleeping area.

What is the difference between a king and double bed in the UK?

A king size bed is 15 cm wider and 10 cm longer than a double bed. The extra dimensions provide more room for movement and are generally preferred by couples seeking added comfort.

Will a double mattress fit in a small bedroom?

Yes, but it's important to measure the room first. A double mattress requires enough surrounding space for ease of movement, ideally with at least 60 cm clearance on each side.

Do bedding and sheets come in standard double sizes?

Most UK bedding retailers offer linens specifically designed for 135 x 190 cm mattresses. Be sure to check sizing on fitted sheets, duvets, and protectors before purchase.