UK mattress sizes explained: small single to super king (with real-world buying advice)

UK mattress sizes explained: small single to super king (with real-world buying advice)

Choosing the right mattress size isn’t just about what fits in your room—it’s about comfort, posture, and long-term value. Think of it like a well-tailored Italian suit: the right cut (size), premium materials, and careful craftsmanship all determine how you feel every day. This definitive UK size guide brings together exact dimensions in cm and inches, practical layout tips for UK homes, delivery considerations for narrow stairs and doors, a couple-space calculator, and curated product picks for different budgets—emphasising quality materials, pocket-spring engineering, and the kind of build detail you’ll appreciate years from now. Use it as your step-by-step check before you buy.

UK mattress size chart (cm and inches)

These are standard UK mattress sizes. Bed frames, headboards, and bedding can vary slightly by brand, but the mattress dimensions below are the reference point. Note: manufacturing tolerances of up to ±2 cm are common, and bed frames typically add a few extra centimetres to overall footprint.

• Small Single: 75 x 190 cm (2'6" x 6'3")
• Single: 90 x 190 cm (3'0" x 6'3")
• Small Double: 120 x 190 cm (4'0" x 6'3") — often called a “Three-Quarter”
• Double: 135 x 190 cm (4'6" x 6'3") — UK’s classic couple size but snug for two
• King: 150 x 200 cm (5'0" x 6'6") — extra length and width
• Super King: 180 x 200 cm (6'0" x 6'6") — the widest standard UK mattress

Tip: If your height is 185 cm or above, the 200 cm length of a King/Super King prevents feet-overhang and lets you stretch fully. As a simple rule, aim for mattress length ≥ your height + 10–15 cm.

Couple space calculator: how much room do you actually get?

Divide the bed width by two to see your shoulder-to-shoulder room. It’s a practical way to decide whether a Double will feel like a tailored fit or a tight squeeze, especially if one of you is a restless sleeper or you share with a pet.

• Double (135 cm): 67.5 cm per person (≈ 26.6 in) — workable, but close.
• King (150 cm): 75 cm per person (≈ 29.5 in) — the sweet spot for many couples.
• Super King (180 cm): 90 cm per person (≈ 35.4 in) — each person gets Single-width space.

Market insight: couples are moving up a size for extra width; King led the market in 2024, and Super King is the fastest-growing segment. If you’re sensitive to partner movement, consider pocket-sprung models that limit motion transfer. Edge support also matters here—firmer borders increase the “usable” width.

UK vs EU vs US sizes (quick comparison)

Buying frames or bedding across regions can be confusing. Use this quick comparison before mixing standards.

• EU common sizes: 90 x 200 (Single), 140 x 200 (Double), 160 x 200 (King), 180 x 200 (Super King). EU lengths are frequently 200 cm.
• US common sizes: Twin 38" x 75", Full 54" x 75", Queen 60" x 80", King 76" x 80", Cal King 72" x 84".
• Translation tip: UK King (150 x 200) ≈ US Queen width but longer than US Full; EU King is 160 x 200. Always match your linens to the mattress standard you buy.

Practical note: a UK Super King (180 x 200) is essentially the width of two UK Singles side by side (2 × 90 cm). If you have an EU frame, check inner dimensions and slat placements—UK mattresses can sit slightly loose or tight depending on the frame build.

When standard sizes don't fit: motorhomes, campervans, and caravans

Not every mattress sits in a rectangular bedroom. If you're kitting out a motorhome, campervan, or caravan, standard UK sizes rarely apply. Cutaway corners, wheel arch intrusions, tapered shapes, and unusual dimensions are the norm – and off-the-shelf mattresses simply won't do the job.

For leisure vehicles, you'll need bespoke mattresses cut to your exact measurements. The good news is that custom doesn't have to mean compromise – the same quality materials, pocket spring systems, and comfort layers available in standard sizes can be built to fit your specific vehicle.

If you're looking for a mattress for your leisure vehicle, explore our specialist sites:

• CaravanMattresses.co.uk – bespoke mattresses for touring caravans and static homes
• MotorhomeMattresses.co.uk – custom-cut mattresses for motorhomes of all sizes
• CampervanMattresses.co.uk – bespoke mattresses designed for campervans and conversions

Minimum room planning for UK homes

Space planning in UK terraced houses, flats, and period properties is about more than the footprint of the mattress. Use this simple framework so your room feels refined, not cramped:

• Clearance rule: aim for ~60 cm on each side and ~90 cm at the foot for comfortable circulation and drawer opening.
• Doors and radiators: leave swing room and heat access; don’t push a bed fully against a radiator.
• Wardrobes: ensure doors can open without hitting the mattress corner.
• Headroom: high headboards and sloped ceilings (lofts) need careful measuring—especially with Super King.

Quick orientation by size (mattress width + clearance on both sides; length + foot clearance):

• Small Single / Single: efficient for box rooms, kids’ rooms, and student lets.
• Small Double: tight premium feel for compact doubles, studio flats, and flexible guest rooms.
• Double: balanced for most UK second bedrooms and many masters—still snug for two.
• King: best for master bedrooms with good walk-around space; great for taller sleepers.
• Super King: statement size for generous masters; plan delivery carefully.

Pro tip: outline the mattress footprint with masking tape, then “walk the room” to test clearances. As a rule of thumb, ideal room width ≈ mattress width + 120 cm. If your room is narrower, consider a slimmer bedside or a bed with integrated storage.

Delivery and access: stairs, doors, and clever workarounds

Narrow staircases and tight Victorian/Edwardian turns are common in the UK. Before you order:

• Measure the narrowest passage, door width, and stairwell turns. Note bannister overhangs and low ceilings.
• If access is tight, consider split divan bases and check if a mattress is available rolled/boxed.
• Super King requires the most planning; measure twice and clear hallways on the day.

Extra access solutions: “zip-and-link” Super King sets (two 90 x 200 cm mattresses zipped together) are easier to manoeuvre; flat-pack frames reduce bulk; and rolled/boxed mattresses typically expand within 24–72 hours after delivery. If you’re replacing a bed, pre-book recycling or removal and confirm delivery slot/parking requirements with your building or council when needed.

For size-specific browsing with access in mind, start with collections by size: Single (Twin), Double, King, Super King.

Bedding and linen fit: sizes and cost awareness

Larger mattresses need larger (and usually pricier) bedding. As a rule:

• Fitted sheets: select the exact UK size (Double/King/Super King) and check depth for deeper mattresses.
• Duvets: UK standards commonly used—Single 135 x 200 cm, Double 200 x 200 cm, King 225 x 220 cm, Super King 260 x 220 cm.
• Budgeting: expect linen costs to scale with size; Super King bedding is typically the most expensive set.

Don’t forget depth and accessories: thicker builds may need 30–36 cm deep fitted sheets; a breathable mattress protector preserves the surface; and King/Super King beds often look proportionally better with King-size pillows (50 x 90 cm) and appropriately sized pillowcases.

Smart product picks by budget and build quality

Below are two clear-value spring mattresses with transparent pricing—practical entry points if you’re outfitting a spare room, student accommodation, or buying on a tight budget. Both use traditional open coil systems with durable damask covers. Each image clicks through for more details. If you’re equipping a high-traffic guest room, these offer straightforward support and easy upkeep; for primary beds, step up to pocket springs for better motion control and contouring.

Craftsmanship highlights across sizes (materials-first picks)

If you’re stepping up from entry-level, look for premium fabrics, pocket spring counts, and zoned support—hallmarks of quality found in Italian tailoring: every stitch, seam, and layer is purposeful. The tiles below show a range of constructions—from cooling gel foam to natural cashmere blends—so you can match your size with the right build. Click any image to explore the broader collection. When comparing, choose your support system first (pocket count or ortho gauge), then fine-tune with comfort layers (latex, gel, memory, or natural fibres).

Which size is right for you? (practical decision guide)

Use the prompts below—like a master tailor would when fitting a suit—to align size, comfort, and value. Consider your height, shoulder width, and whether kids or pets join you; then balance space with room layout and access.

• Small Single (75 x 190): narrow box rooms, bunk beds, and tight children’s rooms where every centimetre counts.
• Single (90 x 190): students, teens, and adults in compact city bedrooms; also ideal for guest rooms with space-efficient furniture layouts.
• Small Double (120 x 190): one sleeper who likes to stretch, or a guest room that occasionally hosts a couple for short stays.
• Double (135 x 190): two adults on a budget; workable but close. Great for second bedrooms and flatshares.
• King (150 x 200): the modern couple’s standard; adds 10 cm width and 10 cm length over Double, which matters for shoulders and height.
• Super King (180 x 200): premium comfort, pets/kids joining occasionally, and anyone who wants each person to have Single-width space.

Further reading: see Mattress Land’s guide How to Choose the Right Mattress Size for extra planning tips.

Support systems and materials: what actually changes your sleep?

Beyond size, the “fabric and lining” of your mattress—springs and comfort layers—shape support and breathability. Here’s how to evaluate:

• Open coil (budget-friendly): dependable value; good for guest rooms and shorter-term use. See the priced examples above for honest specs.
• Pocket springs (1000–2000+): each spring moves independently to contour your body and reduce partner disturbance. A step up in lasting comfort.
• Orthopaedic tuning (12.5G springs): designed for firmer alignment, often preferred by back-sleepers or those needing extra support.
• Comfort layers: - Latex/laytech: buoyant and breathable. - Gel foam: cooler feel for hot sleepers. - Natural fibres (cashmere, organic cotton): luxurious feel and breathable microclimate.

Everyday care: rotate head-to-toe regularly (often monthly for the first 3 months, then quarterly) unless your mattress is clearly labelled “no turn.” Minor body impressions can be normal as fillings settle. Your base matters too: slatted frames typically work best with gaps ≤ 7.5 cm and a centre support rail on King and above.

Dig deeper into spring tech with Discover the Benefits of Pocket Spring Mattresses, or compare needs with Orthopedic vs Regular Mattresses.

Advice by UK property type

• Terraced houses: measure stair turns carefully; King often fits, Super King may need split base or alternative route (balcony, large window) if access is very tight.
• Flats: check lift dimensions and booking rules for deliveries; King is a common limit for small lifts without a split base.
• Period properties: mind lower door frames, thick walls, and narrow hallways; rolled delivery can be a strategic advantage where available.

Planning tip: confirm delivery windows, lift bookings, and parking permits in advance. Photograph tricky corners and share measurements with the delivery team if you’re unsure.

Research-backed trend: why more people are upsizing

UK shoppers are prioritising comfort and width—data shows King-size led the market in 2024 (37.73% share), with Super King demand accelerating at roughly 10% annually. The takeaway is simple: more space means better personal alignment and less partner disturbance—especially when paired with quality pocket springs and breathable materials. If you value a “bespoke” feel, moving up a size and investing in premium materials is akin to upgrading from an off-the-peg suit to one with Italian-level craftsmanship and cloth.

Quick links by size (shop curated ranges)

Fitting the mattress to your sleep style

Size and materials should support the way you sleep:

• Side sleepers: benefit from pressure relief at shoulders/hips; consider pocket springs with adaptive foam/latex comfort. Explore ideas in Top 5 Mattresses for Side Sleepers.
• Back pain focus: look for orthopaedic builds (12.5G systems, zoned springs) and supportive medium-firm feels; see Top Rated Mattresses for Back Pain Relief and Spinal Alignment Mattress Buying Guide 2025.
• Stomach/front sleepers: often prefer a slightly firmer, flatter surface to keep hips from dipping—pocket or ortho springs with minimal sink in the comfort layer.
• Hot sleepers: prioritise breathable covers, gel or latex comfort layers, and natural fibres to improve airflow.
• Couples with different builds: pocket springs improve motion isolation; consider firmer edge support and a larger size (King/Super King) for personal space.
• Students/letting: durable value with open coil or 1000 pocket springs; compact Single/Small Double sizes optimise space. Procurement tips in Student Accommodation Mattress Requirements.

FAQ: simple, specific answers

• Is a Double big enough for two adults? Yes, but it’s close (67.5 cm per person). If you value personal space, upsize to King.
• What’s the main benefit of Super King? Each sleeper gets Single-width space; highly effective for motion isolation when paired with pocket springs.
• Will EU linens fit UK mattresses? Not reliably—lengths and widths differ. Match linens to UK sizing for the best fit.
• Are firm orthopaedic mattresses right for everyone? Not necessarily. They’re tuned for alignment; comfort preference still matters. Try medium-firm if you’re unsure.
• Do I need a deeper sheet for premium models? Possibly—check mattress depth and buy fitted sheets with the matching pocket depth.
• Can I use a UK mattress on an EU or US bed frame? Sometimes, but check the inner frame size and slat spacing; expect small gaps or tight fits if standards differ.
• What base is best? Divans and solid/slatted frames both work; for slats, aim for gaps ≤ 7.5 cm and a centre rail on King and above.
• How often should I rotate the mattress? Typically monthly for the first 3 months, then quarterly (unless labelled no-turn).

Final checklist before you buy

• Measure your room and delivery pathway.
• Choose size based on couple space and height (King/Super King if 185 cm+ or broad shoulders).
• Match materials to needs: open coil for budget/guest rooms; pocket springs (1000–2000) for main beds; orthopaedic spring gauges for extra support; gel/latex for cooling/bounce.
• Check your base: frame dimensions, slat gaps (≤ 7.5 cm), and centre support for larger sizes.
• Plan bedding: correct UK size and depth; remember bigger sizes mean higher linen costs.
• Time your delivery, book access/parking, and arrange old mattress removal—especially for Super King. Consider zip-and-link if access is tight.

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Need help translating size to comfort? Start here

Two useful resources if you’re still narrowing the field:

• How to Choose the Right Mattress Size — good if you’re deciding between Double and King.
• Mattress Budget Calculator UK 2025 — tailored picks for your budget and priorities.

Whether you need a compact Small Single for a box room or an indulgent Super King built with premium springs and breathable fabrics, treat size and construction like the cut and cloth of a luxury suit. Get those right, and the rest—sleep quality, durability, and satisfaction—falls neatly into place.