Bed Size Guide UK – Bed Dimensions & Bedroom Size Guide

Introduction:

You’ve found the perfect bedroom. You know roughly what bed size you want. And then you start measuring and nothing seems to add up. Is a king size 150 cm or 160 cm? Does a double actually fit two adults? What on earth is a small double versus a 3/4?

You’re not alone. UK bed sizes have their own rules different from Europe, different from America, and occasionally different from one retailer to the next.

This guide cuts through all of it. We cover every standard UK bed size from small single to super king, give you the exact dimensions in centimetres and inches, tell you what room size you actually need for each one, and help you work out which size genuinely suits your situation. 

Whether you’re buying a master bedroom, a guest room, a rental property, or a hotel this is the only bed size guide you’ll need in 2026.

What Is A Standard Bed Size In The UK?

UK bed sizes follow a set of standard width measurements, with the length typically fixed at either 190 cm or 200 cm depending on the size. There are six core individual bed sizes recognised across the UK: small single, single, small double, double, king size, and super king. Each has a standardised width, and bed frames are always named after the mattress size they hold, not their own outer dimensions.

Here’s the complete UK bed size chart at a glance:

Bed Size	Width (cm)	Length (cm)	Width (ft/in)	Length (ft/in)	Best For
Small Single	75 cm	190 cm	2ft 6in	6ft 3in	Young children, cots to bed transition
Single	90 cm	190 cm	3ft	6ft 3in	Children, teens, solo guests
Small Double / 3/4	120 cm	190 cm	3ft 11in	6ft 3in	Solo adults, guest rooms, small bedrooms
Double	135 cm	190 cm	4ft 6in	6ft 3in	Couples, solo sleepers who like space
King Size	150 cm	200 cm	5ft	6ft 6in	Couples, taller sleepers
Super King	180 cm	200 cm	6ft	6ft 6in	Couples wanting maximum space

One thing worth noting straight away: your bed frame will always be slightly larger than these measurements. A double frame holds a 135 cm mattress, but the frame itself typically adds 5–10 cm on each side. Always check the frame’s outer dimensions, not just the mattress size when planning your room layout.

The one exception? Divan beds. A divan base is built to match the mattress dimensions exactly, sitting flush on all sides. That makes them the most space-efficient choice for smaller bedrooms. If you’re not sure how divans differ from traditional frames, our divan bed guide explains the base types, storage options, and main pros and cons.

Every UK Bed Size Explained (with visual)

Here’s a visual guide showing exactly how all UK bed sizes compare in width so you can see at a glance what you’re actually choosing between:

Now here’s every size broken down in detail:

Small Single — 75 cm × 190 cm (2ft 6in × 6ft 3in) This is a child’s first proper bed. Narrow, compact, and suited to rooms where a standard single would be too wide. Good for children up to around age 7–8. Not practical for adults, the width is too restrictive for comfortable sleep. Replacement mattresses are widely available but bedding is more limited.

Single — 90 cm × 190 cm (3ft × 6ft 3in) The standard size of single bed that most people picture. Works well for children, teenagers, and adults in compact rooms. An individual bed size that suits one person comfortably though taller adults (over 5ft 11in) may find the 190 cm length a little snug. Consider a European-length single (90 × 200 cm) if height is a factor.

Small Double / 3/4 — 120 cm × 190 cm (3ft 11in × 6ft 3in) Often called a small double or three quarter bed. Exactly 30 cm wider than a single which sounds modest but makes a real difference when you’re lying in it. Perfect as a small double bed in rooms that can’t fit a full double. Can technically sleep two people, though it’s genuinely comfortable for one adult. A popular individual bed size for guest rooms and studio flats.

Need a closer look at this size? Read our full 3/4 bed guide covering width, mattress size, room fit, and who it suits best.

Double — 135 cm × 190 cm (4ft 6in × 6ft 3in) The standard size double bed in the UK. Most commonly bought by couples, though the maths is worth knowing: at 135 cm wide, two people each have roughly 67.5 cm — about the same space a baby gets in a cot. It works, but if you’re a light sleeper or move around, a king size will genuinely improve your sleep. Double bed size in England has been this standard for decades frames, mattresses and bedding are universally available.

King Size — 150 cm × 200 cm (5ft × 6ft 6in) King size has overtaken the double as the most popular UK bed size in recent years. The 200 cm length suits taller sleepers much better than a double, and the extra 15 cm of width makes a noticeable difference for couples. If your bedroom can accommodate it, the king size is the upgrade most people are glad they made.

Super King — 180 cm × 200 cm (6ft × 6ft 6in) The super king bed size UK is the largest standard size available. Six feet wide, a full foot wider than a king. Genuinely luxurious for couples, and ideal for co-sleeping families. Your bedroom needs to be a serious size to carry this off comfortably; you’ll need at least a 14 m² room for it not to feel overwhelming. Heaven Beds’ super king divan range includes ottoman storage bases, which are near-essential at this size.

What Bedroom Size Do You Need For Each Bed?

This is the section most bed guides miss entirely and it’s the question that matters most when you’re actually planning your room.

Here’s the honest guide to minimum and comfortable bedroom sizes for every bed size in the UK. These figures assume you want at least 60 cm of walkway on the access side, 90 cm at the foot of the bed, and space for a wardrobe.

Bed Size	Bed Dimensions	Min. Bedroom	Comfortable Bedroom
Small Single	75 × 190 cm	7 m²	8–9 m²
Single	90 × 190 cm	7.5 m²	9–10 m²
Small Double / 3/4	120 × 190 cm	8.5 m²	10–11 m²
Double	135 × 190 cm	9.5 m²	11–12 m²
King Size	150 × 200 cm	11 m²	13–14 m²
Super King	180 × 200 cm	13 m²	15–16 m²

A few things worth knowing:

The 60 cm rule. You need at least 60 cm of clear walkway on the side you get in and out of bed. Less than that and it starts to feel genuinely cramped every single morning. Bensons for Beds recommends allowing at least 24 inches (60 cm) of walking space on either side of the bed and at its foot.

Storage drawers need extra clearance. If you’re ordering a bed with storage drawers, you’ll need to allow a minimum of 55 cm on either side for the drawers to be pulled out. Ottoman beds lift from the foot end so they need clear space there instead.

New builds often fall short. UK new-build bedrooms are frequently designed to minimum legal standards. A double bedroom requires a minimum of 11.0 square metres in floor area under UK regulations. That meets the standard but it doesn’t always leave comfortable space around a king size bed. Measure first, always.

Older homes are different. Pre-1960s properties often have genuinely large bedrooms with high ceilings. If you’re in a Victorian or Edwardian house, you may have more room than you think don’t automatically rule out a king or super king.

UK vs EUROPEAN vs US BED SIZES

This is where buyers come unstuck. You’ve measured your room, ordered a frame from a European retailer, and the mattress you already own doesn’t fit. It happens more than you’d think.

Here’s the critical comparison:

Size Name	UK (cm)	European (cm)	US (cm)	Key Difference
Single / Twin	90 × 190	90 × 200	99 × 191	EU is 10 cm longer
Double / Full	135 × 190	140 × 200	137 × 191	EU is wider and longer
King Size	150 × 200	160 × 200	193 × 203 (E.King)	US king is much wider
Super King	180 × 200	180 × 200	183 × 203 (Cal.King)	Similar but US is longer

The IKEA problem. This catches people out constantly. IKEA uses their own dimensions that sit between UK and European standard sizes, which means a UK mattress and an IKEA bed frame are frequently not compatible. IKEA’s double equivalent is 140 cm × 200 cm versus the UK standard 135 cm × 190 cm.

If you have an IKEA frame, measure it before ordering a replacement mattress. A standard UK double mattress will not fit properly in an IKEA double frame.

Buying from European sites? Double-check every dimension. European beds are generally 10 cm longer than UK equivalents, and their doubles are wider. Bedding bought for a European frame won’t necessarily fit a UK mattress of the same name.

At Heaven Beds, all our divan beds, ottoman beds and upholstered frames are built to standard UK dimensions so your mattress, base and bedding will always be compatible.

Which Bed Size Is Right For You?

Here’s the honest, no-nonsense version. Stop overthinking it.

You’re a solo sleeper in a standard bedroom (10–12 m²) Go double. It gives you room to spread out without dominating the space. A double divan with two storage drawers is one of the most practical setups you can buy.

You’re a couple in a standard bedroom King size if you can fit it. The extra width genuinely improves sleep quality for two people. If your room is under 11 m², a double is fine but go for 200 cm length if anyone in the couple is over 5ft 10in.

You’ve got back pain Bed size matters less than mattress type here. But if you’re buying a new bed anyway, a king or super king gives you room to change position without disturbing your partner which matters when you’re sleeping lightly. Pair with a pocket sprung mattress on a firm platform divan base.

You’re furnishing a guest room Small double (120 cm) is the smart choice. Comfortable for one adult, workable for two at a push, and it doesn’t sacrifice your whole spare room to one giant bed. A 3/4 divan with ottoman storage does double duty beautifully.

You’re buying for a child Single to start (90 cm). They’ll grow into it, and single bed frames are widely available in every style. Consider a divan with two drawers, storage in a child’s room is never wasted.

You’re buying for a hotel or rental property Doubles for standard rooms, king size for premium rooms. Super kings in master suites if the room can carry it. Hospitality buyers: Heaven Beds supplies trade orders with volume pricing, get in touch directly.

You’re very tall (over 6ft 2in) Prioritise length over width. King and super king beds are 200 cm long that’s your minimum. Some manufacturers offer 210 cm options; Heaven Beds can advise on extended-length options.

If you prefer a lower, more minimalist sleep setup, our guide to floor beds and bed-inside-floor designs explores whether that look works in real UK bedrooms.

Pros And Cons By Bed Size

Single (90 cm)
✅ Space-efficient, widely available, affordable, great for kids and guests
❌ Too narrow for most adults as a permanent bed; couples simply can’t share one comfortably

Small Double / 3/4 (120 cm)
✅ Perfect solo adult size; fits rooms where a double won’t; great with divan storage
❌ Tight for two people regularly; bedding slightly harder to source than standard sizes

Double (135 cm)
✅ UK standard mattresses, frames and bedding everywhere; works for couples; fits most bedrooms
❌ Only 67.5 cm per person for couples less than a baby cot; 190 cm length short for taller sleepers

King Size (150 cm)
✅ The most popular UK size for good reason; 200 cm length suits taller adults; noticeably more comfortable for couples
❌ Needs a proper-sized bedroom (11 m²+); pricier than a double for frame, mattress and bedding

Super King (180 cm)
✅ Maximum comfort; brilliant for couples, co-sleepers and anyone who hates being cramped
❌ Needs a large bedroom (13 m²+); significantly higher cost; heavier mattress to manoeuvre

Bed Buying Checklist

Before you order anything, run through this. It takes ten minutes and saves a lot of grief.

Measure your room first

• Write down the room dimensions in cm, not feet
• Mark out the bed footprint using masking tape it sounds silly but it works
• Check door swing, wardrobe doors and drawer clearance
• Allow minimum 60 cm walkway on the side you get out of bed

Check delivery access

• Measure your front door, hallway width and staircase
• A super king or king mattress is large confirm with the retailer how it’s delivered (rolled, folded, or flat)
• Heaven Beds delivers all divan bases split into two halves for easier access through narrow UK doorways

Match your mattress to your base

• Frame beds: always check the outer frame dimensions, not just the mattress size — frames add 5–10 cm on each side
• Divan beds: the base matches the mattress exactly, making room planning simpler
• Heaven Beds divans are available in all UK standard sizes, in both 190 cm and 200 cm lengths

Choose your storage option

• Two drawers: good for most bedrooms, easy access from the side
• Four drawers: maximum storage, ideal for replacing a chest of drawers
• Ottoman: best for bulky items (duvets, cases, out-of-season clothing)

Budget for bedding

• Double and king bedding is available everywhere; super king and small double bedding is easier to find online
• Don’t forget mattress protectors — they’re worth every penny

Bed Sizes Frequently Asked Questions

What is the standard UK bed size?
The most commonly purchased bed size in the UK is currently the king size (150 × 200 cm), which has overtaken the double in recent years. Standard UK bed sizes run from small single (75 × 190 cm) through to super king (180 × 200 cm), with single, small double, double and king in between.

What size is a double bed in the UK?
A standard double bed in the UK measures 135 cm wide by 190 cm long (4ft 6in × 6ft 3in). This is the standard size double bed dimension used by virtually all UK manufacturers. The bed frame itself will typically be slightly larger than these measurements.

What is the difference between a UK king size and a US king size?
A UK king size bed is 150 × 200 cm (5ft × 6ft 6in). A US king size (Eastern King) is approximately 193 × 203 cm significantly wider. If you’re buying bedding or a mattress from a US retailer for a UK frame, the sizes are not interchangeable.

How big is a super king bed in the UK?
The super king bed size UK is 180 cm wide by 200 cm long (6ft × 6ft 6in). It’s the largest standard UK bed size. You’ll need a bedroom of at least 13 m² to fit it comfortably with adequate space around the sides and foot.

What size bedroom do I need for a double bed?
For a comfortable double bedroom, aim for at least 11–12 m² of floor space. A double will technically fit in a room as small as 9.5 m², but you’ll have limited space for furniture and walkways. UK building regulations require a minimum of 11 m² for a designated double bedroom in new builds.

Is a small double the same as a 3/4 bed?
Yes, a small double and a 3/4 bed are the same size: 120 cm wide by 190 cm long. Some retailers use these names interchangeably. It’s also sometimes called a queen size in older UK usage, though that term has largely been replaced.

What size bed should a couple buy?
Most couples in the UK sleep in a double (135 cm), but a king size (150 cm) is the better choice if the room allows it. A double gives each person just 67.5 cm of width — about the same as a cot. The extra 15 cm of a king makes a genuine, noticeable difference to sleep quality, especially if either person moves around during the night.

Do UK and IKEA bed sizes match?
No. IKEA uses its own sizing system that doesn’t match standard UK dimensions. An IKEA double frame is 140 × 200 cm, while a UK double mattress is 135 × 190 cm. If you have an IKEA frame, always measure it before ordering a replacement mattress from a UK retailer.

Summary:

Choosing the right bed size comes down to three things: your room, who’s sleeping in it, and how much you value a good night’s rest. Measure your room honestly. Don’t default to a double just because it’s the standard if you’re two adults and your room can fit a king, it’s worth every extra centimetre.

If you’re ready to find your perfect bed, Heaven Beds has the full range from compact single divan beds to handcrafted super king ottoman beds all made in the UK, finished in premium fabrics, and delivered free to your door. Every size. Every storage option. No compromise on quality.

Measure up, pick your size, and sleep better tonight.