Long Single vs King Single: Which Mattress Size Is Right for You?
The main difference between a long single and a king single mattress is width.
A long single mattress measures 92 × 203 cm, while a king single mattress measures 107 × 203 cm. A king single mattress is 15 cm wider than a long single mattress, while both sizes share the same 203 cm length.
For most adults and teenagers, a king single offers better everyday comfort because of the extra width. A long single is typically the better choice for adjustable beds, split king systems, and narrower bedrooms where floor space is limited.
Long Single vs King Single Mattress Size Comparison
| Feature | Long Single | King Single |
|---|---|---|
| Dimensions (W × L) | 92 × 203 cm | 107 × 203 cm |
| Suitable for Tall Sleepers | Yes | Yes |
| Adjustable Bed Compatible | Excellent | Good |
| Space Efficiency | Excellent | Good |
| Sleeping Room | Moderate | More Spacious |
| Popularity in Australia | Moderate | High |
For most sleepers, the king single feels noticeably roomier thanks to its extra width. However, the long single remains a popular choice for adjustable beds and compact bedrooms.
What Is a Long Single Mattress?
A long single mattress measures 92 cm wide and 203 cm long.
It offers the same width as a standard single mattress but provides an additional 15 cm of length. This makes it a practical solution for people who need extra legroom without increasing the footprint of the bed.
Long single mattresses are commonly used for:
- Adjustable beds
- Split king systems
- Teenagers experiencing growth spurts
- Taller adults
- Narrow bedrooms
Because of their compatibility with adjustable bases, long single mattresses have become increasingly popular in Australia.
If you're unfamiliar with this size, see our complete Long Single Mattress Size Guide Australia for dimensions, room recommendations, and buying advice.
What Is a King Single Mattress?
A king single mattress measures 107 cm × 203 cm.
It shares the same length as a long single but offers 15 cm more width.
This extra space makes a king single one of Australia's most popular mattress sizes for:
- Teenagers
- Young adults
- Guest bedrooms
- Solo sleepers wanting more room to move
Many Australians consider a king single the ideal upgrade from a standard single because it delivers significantly more comfort without requiring the space of a double mattress.
The Biggest Difference: Width
Although both mattress sizes are 203 cm long, the width difference is what most sleepers notice.
Long Single
- Width: 92 cm
- Best for maximising floor space
- Ideal for narrow rooms
King Single
- Width: 107 cm
- Provides more shoulder room
- Easier to change sleeping positions comfortably
An extra 15 cm may not sound significant, but over years of use it can noticeably improve sleep comfort, particularly for adults.
If room size isn't a major limitation, most sleepers find the king single more comfortable for everyday use.
Which Size Is Better for Tall Sleepers?
Both mattress sizes perform equally well for height.
Since both measure 203 cm long, they provide sufficient legroom for many Australian adults.
However, taller sleepers often benefit from the additional width of a king single.
Choose a Long Single If:
- You need extra length only
- Space is limited
- You use an adjustable bed
Choose a King Single If:
- You're tall and broad-shouldered
- You move frequently during sleep
- You want more long-term comfort
For sleepers over 180 cm tall, either option works well, but the king single generally provides a more spacious sleeping experience.
Which Mattress Is Better for Small Bedrooms?
Room size is often the deciding factor.
| Bedroom Type | Recommended Size |
|---|---|
| Very narrow room | Long Single |
| Standard bedroom | King Single |
| Guest room | Either |
| Adjustable bed setup | Long Single |
| Apartment bedroom | Long Single |
If every centimeter matters, the long single helps preserve valuable floor space.
If the room comfortably fits both options, the king single usually offers better overall comfort.
Long Single vs King Single for Adjustable Beds
This is where the long single has a clear advantage.
Many adjustable beds in Australia are designed around the long single mattress size.
A typical split king setup consists of:
2 × Long Single Mattresses = 1 Split King Bed
This configuration allows partners to adjust each side independently while maintaining the overall dimensions of a king-size bed.
If you're considering an adjustable base, a long single mattress is often the preferred choice.
Who Should Choose a Long Single Mattress?
A long single mattress may be the right option if:
- You use an adjustable bed
- You're building a split king setup
- You have a narrow bedroom
- You need extra length but not additional width
- You're upgrading from a standard single
For practical space-saving, it's one of the most efficient mattress sizes available.
Who Should Choose a King Single Mattress?
A king single mattress may be the better choice if:
- You're a teenager or young adult
- You're a solo sleeper wanting more room
- You change positions frequently during sleep
- You want long-term comfort
- Your bedroom has sufficient space
For many Australians, the king single represents the ideal balance between comfort and practicality.
Best Mattress Options for Long Single and King Single Beds
Choosing the right size is only part of the equation. Mattress construction also plays an important role in comfort and support.
Onebed Essential
Available in Long Single and King Single sizes, the Onebed Essential is a practical option for:
- Teenagers
- Guest rooms
- First-home buyers
- Budget-conscious sleepers
Its balanced medium feel provides everyday comfort without unnecessary complexity.
Onebed Original Hybrid Mattress
Also available in both Long Single and King Single sizes, the Onebed Original combines:
- Pocket spring support
- Adaptive comfort foam
- Zoned ergonomic design
This hybrid construction delivers enhanced airflow, responsive support, and pressure relief, making it a popular choice for everyday use and adjustable bed compatibility.
Quick Verdict
| If You Need... | Best Choice |
|---|---|
| Maximum width | King Single |
| Extra length | Either |
| Adjustable bed compatibility | Long Single |
| Split king setup | Long Single |
| More sleeping space | King Single |
| Best all-round comfort | King Single |
For most solo adults and teenagers, a king single offers the better long-term sleeping experience.
For adjustable bed users or those working with limited floor space, a long single remains an excellent choice.
FAQs
Is a king single bigger than a long single?
Yes. A king single is 15 cm wider than a long single while maintaining the same length.
Are long single and king single mattresses the same length?
Yes. Both sizes measure 203 cm long.
Which mattress size is better for adults?
For most adults, a king single provides greater comfort due to its wider sleeping surface.
Is a long single mattress suitable for adjustable beds?
Yes. Long single mattresses are one of the most common sizes used with adjustable bed bases in Australia.
What is the difference between a long single and a king single mattress?
The primary difference is width. A king single is 107 cm wide, while a long single is 92 cm wide.
Can two long single mattresses make a king bed?
Yes. Two long single mattresses placed side by side create a split king configuration.
Which mattress size is more popular in Australia?
King single mattresses are generally more popular for teenagers and solo adults, while long single mattresses are commonly used for adjustable beds.
Should I choose a long single or king single?
Choose a long single if space efficiency or adjustable bed compatibility is your priority. Choose a king single if you want more room to sleep comfortably.
