A king single bed measures 107cm wide and 203cm long that's the standard Australian size, and it's the number to remember before you buy anything else. It sits between a single and a double: noticeably roomier than a single mattress, but still compact enough to fit a small bedroom or a growing kid's room without eating up the whole floor.
If you're a parent whose child has outgrown their single bed, someone setting up a guest room, or an adult who wants more legroom than a standard single without committing to double-bed floor space, this guide is for you. Below, we'll break down the exact measurements, how a king single compares to every other Australian bed size, how much room you actually need in your bedroom, and what size sheets to buy because getting that wrong is one of the most common (and annoying) mistakes people make with this bed size.
What Are the Standard King Single Bed Dimensions?
| Measurement | King Single Size |
|---|---|
| Width | 107 cm |
| Length | 203 cm |
| Width in metres | 1.07 m |
| Length in metres | 2.03 m |
| Approx. width in feet | 3.5 ft |
| Approx. length in feet | 6.7 ft |
That's the mattress size. It's worth knowing there's a difference between mattress dimensions and bed-frame dimensions a king single bed frame will usually measure a little wider and longer than the mattress itself, since the frame needs to wrap around the edges. Depending on the headboard style and whether the frame has side rails or a footboard, the overall footprint can run several centimetres larger in each direction. If you're tight on space, always check the manufacturer's exact frame measurements rather than assuming it matches the mattress size exactly.
Mattress dimensions themselves can also vary slightly between brands a couple of centimetres either way is normal and won't affect fit with a properly sized king single mattress and frame combo.
King Single vs Single vs Double: Which Size Do You Actually Need?
This is usually the real question behind "what are the dimensions of a king single bed" people aren't just curious about the number, they're trying to decide between sizes. Here's how they stack up:
| Bed Size | Approx. Width | Approx. Length |
|---|---|---|
| Single | 92 cm | 188 cm |
| King Single | 107 cm | 203 cm |
| Double | 138 cm | 188 cm |
| Queen | 153 cm | 203 cm |
| King | 183 cm | 203 cm |
Notice the pattern: a king single is 15cm wider and 15cm longer than a standard single bed genuinely more sleeping space in both directions, not just a marketing name. But compared to a double bed, the king single is actually narrower (107cm vs 138cm) while being longer (203cm vs 188cm). That's the trade-off in one sentence: a king single trades width for length.
That makes it the better pick for taller single sleepers who keep hitting the end of their mattress, and the weaker pick if two people are sharing 107cm is workable for one adult but tight for two. A double, queen, or king handles couples far better.
How Big Is a King Single Bed in Feet and Inches?
If you think in feet rather than centimetres, here's the quick conversion:
- Width: approximately 3.5 feet (about 3'6")
- Length: approximately 6.7 feet (about 6'8")
For context, that length comfortably suits sleepers up to around 195cm (6'5") tall with normal clearance at the foot of the bed a big step up from a standard single's 188cm length, which starts feeling short for taller teens and adults.
How Much Room Do You Need for a King Single Bed?
There's no single official minimum room size, because it depends on your layout and what other furniture is going in with it but here's a practical way to think about it:
- Walking space: aim for at least 60–70cm of clear floor on the sides you'll actually walk around, more if it's a main thoroughfare in the room
- Bedside table: budget roughly 40–50cm width if you want one on either side
- Wardrobe and drawer clearance: door swing and drawer pull-out distance both need to be factored in, not just the footprint of the furniture itself
- Doors and windows: make sure the bed placement doesn't block a door swing or sit awkwardly under a window
How to Measure Your Bedroom Before You Buy
- Measure the room's total length and width.
- Mark out the mattress footprint (107cm × 203cm) with tape or on paper first.
- Add the bed frame's actual dimensions, not just the mattress size — frames run a few centimetres larger on every side.
- Allow clearance for walking, doors, and any furniture you're keeping.
- Double-check wardrobe doors, drawers, and windows aren't obstructed once the bed is in place.
A rough rule of thumb: a king single fits comfortably in bedrooms from around 2.8m × 3m upward, though smaller rooms can still work if the bed is positioned against a wall with minimal extra furniture.
Who Is a King Single Bed Actually Good For?
- Teenagers and pre-teens outgrowing their childhood single bed the extra length buys years of use before they need to upgrade again
- Adults in guest rooms enough size to sleep comfortably solo without dedicating a full double or queen's worth of floor space to a room that's mostly empty
- Taller sleepers who find a standard single's 188cm length too short, but don't have room (or need) for a double
- Small apartments or box rooms where a queen or king simply won't fit, but a plain single feels too narrow for an adult
It's genuinely one of the more versatile sizes in the Australian lineup long enough for adults, compact enough for small rooms, and a natural "grows with them" option for kids who are past the toddler-bed stage.
What Size Sheets and Bedding Fit a King Single Bed?
This trips more people up than the mattress size itself. A single mattress and a king single mattress are not interchangeable when it comes to sheets a standard single fitted sheet will be too small on both width and length, and it won't stay on properly.
When shopping for bed sheets or a full bedding set, look specifically for "king single" sized fitted sheets, flat sheets, and quilt covers not "single." A few things to check:
- Fitted sheet pocket depth: check this against your actual mattress thickness (including any mattress topper), not just the length and width a shallow pocket will pop off a thicker mattress
- Flat sheets and quilt covers: these have a bit more forgiveness in fit, but sizing them to "king single" specifically still gives the cleanest result
- Double-check before you buy: because "king single" bedding is a smaller market than single, double, or queen, range and availability can be more limited it's worth confirming stock before assuming a set is available in this size
Pros and Cons of a King Single Bed
Advantages
- More sleeping length than a single, better for taller sleepers
- Compact enough to work in smaller bedrooms
- A practical "in-between" for teens and guest rooms
- Doesn't dominate the room the way a double or queen can
Disadvantages
- Narrower than a double, so it's not really built for two people
- Bedding and sheets can be less widely stocked than more common sizes
- Takes up noticeably more floor space than a plain single, so it's not the right call for very tight rooms
Frequently Asked Questions
What are the dimensions of a king single bed?
A king single bed measures 107cm wide and 203cm long (1.07m × 2.03m), or approximately 3.5ft × 6.7ft.
What size is a king single mattress in Australia?
The standard Australian king single mattress size is 107cm wide by 203cm long the same across mattress and general bed-size terminology.
Is a king single bigger than a single?
Yes. A king single is 15cm wider and 15cm longer than a standard Australian single bed (92cm × 188cm).
Is a king single the same size as a twin XL?
Not quite. A US twin XL mattress measures roughly 99cm × 203cm close in length to a king single, but noticeably narrower in width.
Can two people sleep on a king single bed?
It's possible for a short time or in a pinch, but at 107cm wide it's genuinely tight for two adults long-term. A double or queen is a better fit for couples.
What size room is suitable for a king single bed?
here's no strict minimum, but bedrooms from roughly 2.8m × 3m upward generally give enough space for the bed plus reasonable walking clearance and other furniture.
What size sheets fit a king single bed?
Always buy sheets and bedding labelled specifically "king single" standard single sheets will be too small in both width and length.
Is a king single good for adults? Y
Yes, particularly for guest rooms, smaller bedrooms, or taller sleepers who need more length than a single bed provides without the space demands of a double
