Mattress Sizes in the UK: Find the Perfect Fit for Your Sleep

Choosing the right mattress size is crucial—not just for fitting your bed frame, but also for your sleep quality, comfort, and movement freedom. In the UK, mattress sizes can differ slightly from other regions, and mattress brands often assign “UK sizes” that may not exactly match global standards. In this guide, we’ll explain standard UK mattress sizes, the pros and cons of each, and how to pick the best size given your needs and sleeping style.

On our site, we offer three core mattress sizes:

• Single: 90 cm × 190 cm

• Double: 135 cm × 190 cm

• King: 150 cm × 190 cm

We’ll refer to those throughout this article and show you how to decide which size is ideal for you.

1. UK Mattress Size Standards & What They Mean

In the UK, mattress sizes are relatively standardized (though small variations can occur). Below is a quick reference table comparing common sizes:

In our product lineup, our “King” is 150 × 190 cm, slightly less in length than some brands that use 150 × 200. This is common in UK contexts; always check your base or bed frame compatibility.

Note: Always check not just mattress dimensions, but also how your bed base, bed frame, bedding (fitted sheets), and headboard design align with those dimensions.

2. Pros & Cons of Each Size

2.1 Single (90 × 190 cm)

✔️ Why choose Single?

• Efficient use of floor space — ideal for smaller bedrooms, guest rooms, or children’s rooms.

• Cost-effective — lower material cost, easier handling and transport.

• Suited for one person with minimal tossing.

❗ Downsides

• Limited movement room — a restless sleeper may feel constrained.

• Less ideal for growing children or adult couples.

2.2 Double (135 × 190 cm)

✔️ Strengths

• The sweet spot for many couples in average-sized bedrooms.

• Balanced width and cost.

• Many accessories (duvet, sheets, mattress protectors) are widely available in this size.

❗ Considerations

• If both sleepers prefer a lot of room or if pets/kids jump in, it might feel a little tight.

• In very small bedrooms, this size can dominate the space.

2.3 King (150 × 190 cm)

✔️ Benefits

• Extra 15 cm width per side compared to Double — more breathing room.

• Better option for couples who move or toss in sleep.

• You gain a bit more “luxury” feel.

❗ Things to check

• Length is 190 cm: if you have a longer bed frame (200 cm depth or longer), make sure the mattress fits without overhang or gap.

• Bedding accessories (duvets, mattress protectors) might be less commonly stocked in 150 × 190; sometimes you’ll see 150 × 200 versions — check compatibility.

3. How Body Type, Sleep Position & Bedroom Size Influence Choice

3.1 Body Size / Height

• If you're over ~190 cm tall, the 190 cm length may feel slightly short (feet might touch the end).

• In that case, check whether brands offer “long” options (e.g., 90 × 200, 135 × 200, 150 × 200).

3.2 Sleep Position & Movement

• Side sleepers and frequent movers benefit more from wider sizes (Double or King).

• Back or stomach sleepers may do okay even on Single if they’re the only occupant.

3.3 Bedroom Size & Layout

• A cramped room with a King mattress may restrict movement or furniture layout.

• Do a mock layout: measure the bed + walking clearance (ideally ≥60 cm on at least one side).

4. What Do UK Mattress Brands Use — Examples & Comparisons

Let’s see how some well-known UK mattress brands price and size their offerings (for comparison):

• Emma — offers UK single (90×190) and UK double (135×190) in many models; their pricing often uses “from £X” for single, then steps upward for doubles and kings.

• Eve Sleep — their “Original” foam mattress is sold in single / double / king sizes (UK standard).

• Simba — their mattress lines are often available in sizes up to King or Super King, and they sometimes list length 200 cm variants in some models.

• Hypnos / Vispring / Silentnight (heritage UK brands) often provide both 190 cm and 200 cm length options in luxury ranges.

The variation of length (190 vs 200 cm) is one of the subtle differences across brands — which is why in your site you must clearly label “150 × 190” and warn customers to check their frames.

5. Best Practices & Tips When Buying in UK Market

1. Label sizes clearly in your site
   Use “UK Single 90×190 cm”, “UK Double 135×190 cm”, “UK King 150×190 cm” — make clear your King is 190 cm length, not 200 cm.

2. Offer longer-length variants if demand arises
   Some customers prefer 200 cm length — you can consider offering 150 × 200 or 135 × 200 as optional upgrades.

3. Include a “Which size suits me?” guide
   Provide a quiz or table to help customers choose based on room size, sleep style, height, and partner/child sharing.

4. Show photography / mockups in scale
   E.g. show a bed frame with the three different mattress sizes in situ — visually show how much extra space King gives over Double, etc.

5. Stock bedding & accessories in matching dimensions
   Especially fitted sheets, mattress protectors, and duvets — ensure you or your suppliers offer 150 × 190 variants so customers don’t worry about compatibility.

6. Use comparison tables & cross-sell
   Let users see side-by-side:
   | Feature | Single | Double | King |
   | — | — | — | — |
   | Width (cm) | 90 | 135 | 150 |
   | Suitable for | Single | Couple / Solo + space | Couples who want extra width |
   | Price step-up | lowest base cost | +X % | +Y % |

7. Warn about frame & base fit
   If a customer has a 200 cm deep bed frame or adjustable base expecting longer mattresses, you can include a tooltip like: “Your existing frame depth is 200 cm — our 190 cm mattress will leave ~10 cm gap; consider upgrade.”