How big is a king single bed?

 

How big is a king single bed?  In Australia, the standard king single mattress measures 107cm wide by 203cm long  15cm wider and 14cm longer than a standard single. This guide is built for parents sizing up a bed for a growing teen, solo adults after more room in a smaller space, and anyone furnishing a guest room on a budget of floor space. Below, you'll find the exact king single bed dimensions, how it stacks up against single, double, queen and king sizes, how much room it actually needs, and the difference between mattress size and full bed-frame size.

What Is the Standard King Single Bed Size?

The Australian king single mattress is 107cm wide × 203cm long. That's the sleeping surface you'll find on every mattress labelled "king single" from major retailers  it's a genuinely standardised size, unlike some overseas markets where "king single" can mean different things.

Compare that to a standard single (92cm × 188cm) and the difference is immediately useful in practice: 15cm of extra width means you can actually turn over without your arm hitting the mattress edge, and 15cm of extra length means a 6-foot teenager isn't sleeping with their feet hanging off the end.

King Single Bed Size in Centimetres

One thing worth flagging early: these numbers describe the mattress, not necessarily the finished bed. More on that distinction below  it trips more people up than any other part of buying a bed.

How Big Is a King Single Bed Compared With Other Sizes?

The pattern worth noticing: a king single is actually longer than a double, even though it's narrower. If you've got a tall sleeper in a narrow room, that's a genuinely useful trade-off  you get the extra leg room without needing double-bed width.

King Single vs Single Bed

A king single beats a standard single on both dimensions:

• 15cm wider — enough to change sleeping position without feeling boxed in
• 15cm longer — no more feet hanging off the mattress edge
• More sleeping space overall, without jumping to double-bed footprint
• Better suited to teenagers mid-growth-spurt and taller adults
• Does need more floor space than a single, so it's not a like-for-like swap in a tight room

Is a King Single Better Than a Single?

For a young child, a single is usually fine  they're not pushing the edges of it yet. But once a kid hits their early teens, a single starts to feel genuinely cramped, and a king single buys years of runway without needing another upgrade. For adults living solo in a studio or one-bedroom apartment, a king single is often the better call too: it's noticeably more comfortable than a single for actual day-to-day sleeping, without eating the room the way a double or queen would.

King Single vs Double Bed

• Width: Double is wider (138cm vs 107cm)
• Length: King single is longer (203cm vs 188cm)
• Sleeping space: Double has more total surface area
• Room requirements: Double needs more floor space, especially width-wise
• Single sleeper suitability: King single is arguably the better fit  same or more length, less bulk
• Couples: Double is the minimum workable width for two adults; a king single isn't designed for it

The practical takeaway: a king single trades width for length compared to a double. If your priority is legroom and not sharing the bed, that trade makes sense. If two people need to fit, a double (or ideally queen) is the safer choice.

King Single vs Queen Bed

• Queen is significantly wider (153cm vs 107cm)
• Both are 203cm long in Australia  identical sleeping length
• King single uses noticeably less floor space
• Queen suits couples; king single suits one adult who wants queen-length sleep without queen-width footprint
• For a guest room used a few nights a month, a king single often makes more financial and spatial sense than a queen

How Much Space Does a King Single Bed Need?

This is where a lot of bed size guides get vague, so let's make it concrete. A king single's footprint is 107 × 203cm, but the room needs to account for more than that:

• Bed footprint: 107 × 203cm minimum
• Walking space: allow at least 60–70cm along at least one side for getting in and out comfortably
• Door clearance: check the bed doesn't block a door swinging open
• Wardrobe clearance: make sure wardrobe doors and drawers can open fully
• Bedside table(s): add roughly 40–45cm per side if you want one
• Other furniture: desks, chairs, or a dresser need their own clear floor area

What Is the Minimum Room Size for a King Single?

There's no single official minimum, but a practical rule of thumb: take the bed footprint (107 × 203cm) and add at least 60cm of clearance on one long side and 30–40cm at the foot. That lands you around 2.4m × 2.7m as a workable minimum for the bed alone  tight, but livable, especially in a studio or box room.

What Is the Ideal Room Size for a King Single?

For comfortable movement around both sides, plus a bedside table and some floor space for a chair or desk, aim for roughly 3m × 3.3m or larger. That gives you breathing room without the bed dominating the space the way a double or queen would in the same footprint.

Is a King Single Bed Good for Adults?

Yes  and this is one of the more underrated uses for the size. At 203cm long, a king single comfortably fits adults up to around 195cm tall with room to spare, which is more than most standard singles or doubles offer. For a solo adult in a share house, apartment, or smaller bedroom, a king single gives genuine long-term comfort without requiring a double or queen's worth of floor space. It's a practical choice for people who sleep alone and want more room to move than a single provides, without paying for width they won't use.

Is a King Single Bed Good for Teenagers?

This is the size's bread and butter. Teenagers grow fast and unevenly, and a standard single often stops fitting well right when it matters most for sleep quality. A king single's extra length future-proofs the bed through the growth-spurt years, and the extra width means a teenager isn't sleeping wedged against the wall. It's also sized sensibly for a typical teen's bedroom  big enough to matter, not so big it swallows the desk and wardrobe space they also need.

King Single Mattress vs King Single Bed Frame Size

Here's the part most buying guides skate past, and it's the one most likely to catch you out.

107 × 203cm refers to the mattress, not the overall footprint of the finished bed. The bed frame around it is almost always larger:

• Headboards and footboards add to the overall length  usually not much (a slim headboard might only add a few centimetres), but a chunky upholstered headboard can add noticeably more.
• Side rails add width  a simple metal frame might add just 2–5cm total, while a padded or upholstered frame can add 10–15cm or more.
• Storage beds (with drawers or a lift-up base) often have the largest footprint of all, since the storage mechanism needs its own clearance.

Practically: a slim platform frame might bring the total footprint to something like 110 × 208cm, while a heavily upholstered frame with a thick headboard could push closer to 120 × 215cm. That difference matters if you're working with a tight room  always check the frame's listed external dimensions, not just the mattress size, before you buy. You can browse a range of king single bed frames with listed dimensions to compare footprints directly.

How to Measure a King Single Bed Frame

1. Measure the overall width of the frame, including any side rails.
2. Measure the overall length, including headboard and footboard if fitted.
3. Check the internal mattress cavity to confirm it matches your mattress size.
4. Confirm the frame's rated mattress thickness  some slatted bases have limits.
5. Add your clearance allowance (see the room-size section above) around the finished footprint, not just the mattress size.

How Much Sleeping Space Does a King Single Provide?

At 107 × 203cm, the sleeping surface is genuinely generous for one person — noticeably more room to change position overnight than a standard single offers. Two people can technically fit, but at 107cm wide that's roughly 53cm each, which is tight even for two people who don't move much in their sleep. It's best treated as a single-sleeper size, even though it stretches further than the name might suggest.

What Size Bedding Do You Need for a King Single?

Look specifically for bedding labelled "king single" fitted sheets in particular need to match the 107 × 203cm mattress size, since a standard single sheet will be too small and a double sheet won't sit properly on the corners.

A useful styling trick: while your fitted sheet and mattress protector should stay true to king single sizing, using a double-size flat sheet, doona, or duvet cover on top can look and feel more luxurious. The extra width drapes over the sides of the mattress, giving a fuller, hotel-style look and a bit more warmth on cold nights. Always double-check the manufacturer's exact measurements before buying, since bedding sizing can vary slightly between brands.

Benefits of Choosing a King Single Bed

More Space Than a Single

15cm extra in both directions adds up to a meaningfully more comfortable night's sleep.

Extra Length for Taller Sleepers

At 203cm, it suits sleepers up to around 195cm without their feet hanging off the end.

Good for Teenagers

Long enough to handle growth spurts, without overwhelming a teen's bedroom.

Works Well in Medium-Sized Bedrooms

Fits comfortably in rooms that would feel cramped with a double or queen.

More Affordable and Space-Efficient Than a Queen

Same 203cm length as a queen, at a fraction of the width and usually the price.

Potential Drawbacks of a King Single Bed

• Takes up more floor space than a standard single
• Narrower than a double or queen  not built for two adults
• Bedding can be slightly less widely available than single or queen sizes
• Not the right choice if you specifically need room for a couple

How to Choose the Right King Single Mattress

• Firmness: match to your usual sleeping position  side sleepers generally want a softer surface, back and stomach sleepers firmer
• Sleeping position: side, back, or stomach sleepers all have different support needs
• Body weight: heavier sleepers may need a firmer core or higher-density foam
• Materials: memory foam, pocket spring, latex, or hybrid  each with different feel and breathability
• Temperature regulation: look for breathable covers or open-cell foams if you sleep hot
• Thickness: thicker mattresses often (not always) mean more support layers
• Warranty and trial period: check both before buying, especially online
• Budget: king single mattresses are generally cheaper than double, queen, or king equivalents

Frequently Asked Questions

How big is a king single bed in Australia?

The standard Australian king single mattress is 107cm wide by 203cm long.

What are king single mattress dimensions?

107cm × 203cm is the standard Australian king single mattress size.

Is a king single bigger than a single?

Yes. It's both wider (by 15cm) and longer (by 15cm).

Is a king single bigger than a double?

It's narrower than a double, but longer  a double is 138 × 188cm versus the king single's 107 × 203cm.

Is a king single the same length as a queen?

Generally yes  both are 203cm long in Australia. The queen is simply wider.

Can two people sleep on a king single bed?

Technically, but it's designed as a single-sleeper size and offers limited width for two adults.

What size room is suitable for a king single?

Aim for roughly 2.4m × 2.7m as a tight minimum, or 3m × 3.3m for comfortable movement and extra furniture.

Is a king single suitable for adults?

Yes , its 203cm length comfortably fits most adults, making it a practical option well beyond the teen years.

What size sheets fit a king single mattress?

Sheets labelled specifically "king single," always checked against your mattress's exact depth before buying.

Conclusion

A king single mattress measures 107cm × 203cm  a size that sits neatly between a single and a double, offering real extra comfort without demanding a double or queen's worth of floor space. It suits growing teenagers, solo adults, and guest rooms equally well, provided you measure your room properly and remember that the bed frame is almost always larger than the mattress alone.

Before you buy, measure your room, check the frame's full external dimensions (not just the mattress size), and decide whether a king single genuinely fits your space and how you'll use it. If you're ready to compare options, take a look at the full range of king single bed frames to find one that matches both your room and your style.