If you’re shopping for a bed for a growing child or a compact guest room in New Zealand, you’ve likely run into the term “king single.” It’s not a marketing gimmick—it’s a genuine size category that sits between a standard single and a double, offering extra length without taking up a double’s floor space. This guide walks you through the exact dimensions, age suitability, comparisons, and buying tips so you can decide if a king single bed is the right fit for your home.

4 related posts

Standard king single dimensions (NZ): 107 cm wide x 203 cm long ·
Typical age range: 8–14 years (Sleepyhead) ·
Price range (frame + mattress): $300 – $800 NZD (Sealy NZ) ·
Length compared to standard single: 15 cm longer

Quick snapshot

1Confirmed facts
2What’s unclear
  • Exact optimal age for transition depends on child’s height and growth patterns – not a fixed number
  • Some brands may use slightly different dimensions – always verify product specs (e.g., Sealy NZ lists 105.5 cm width)
3Timeline signal
4What’s next
  • Consider transitioning to a king single when child’s height exceeds the single’s 188 cm length (Wise Move)
  • If more width is needed later, a single to double upgrade may be worth evaluating (Wise Move)

Five key facts about the king single bed in New Zealand, one pattern: the dimensions are nearly universal, but small brand variations exist and price depends on frame type and storage features.

Fact Value
Standard width 107 cm
Standard length 203 cm
Typical age range 8–14 years
Common price (frame + mattress) $400–$700 NZD
Length advantage vs single +15 cm

What size is a king single bed in NZ?

What are the exact dimensions?

The standard king single mattress in New Zealand measures 107 cm wide by 203 cm long, according to Sleepyhead, Harvey Norman NZ, and Ecosa NZ. However, Sealy NZ lists the width as 105.5 cm—a small variation that underscores the importance of checking product specs before buying. The length consistently matches that of king and super king sizes, making it the longest single option available.

How does it compare to a single and double?

  • Standard single: 91–92 cm wide x 188–190 cm long (Sleepyhead; Sealy NZ)
  • King single: 107 cm x 203 cm (or 105.5 cm depending on brand)
  • Double: 137 cm x 188 cm (Sleepyhead)

The implication: the king single gives you an extra 15–16 cm in width and a full 15 cm in length over a standard single, while remaining 30 cm narrower than a double—ideal for one person in a compact room.

The trade-off

The king single is not a double. Two adults cannot share it. For a solo sleeper who needs legroom, it’s the smart buy; for couples, a double or queen is the minimum.

The catch: the king single sacrifices width for length, making it a niche choice for tall individuals who sleep alone.

Is there such a thing as a king single bed?

Why is it called king single?

The name reflects its position: it’s the “king” of single beds—longer and wider than a standard single, but still designed for one person. Sleepyhead calls it “a perfect step up from a single.” In New Zealand and Australia, it’s a standard size, distinct from the US “twin XL” which is 99 cm x 203 cm.

Is it a standard size in NZ?

Yes. Most NZ mattress makers and retailers stock king single as a standard size. Sleepyhead, Sealy NZ, and BedsRus all list it. The Wise Move guide confirms it’s a common choice for growing children and teens.

Is a king single the same as a double in NZ?

Differences in dimensions

No. A double bed is 137 cm wide—30 cm wider than a king single. But the double is only 188 cm long, while the king single stretches to 203 cm. So the king single wins on length; the double wins on width. The trade-off is clear: one sleeper who is tall needs the king single; two sleepers need the double.

Which is better for one person?

For a single occupant, the king single offers more legroom and a smaller footprint, making it easier to fit into a child’s or teen’s room. Wise Move recommends a minimum room size of 2.4 m x 3.0 m for a king single, or 2.1 m width without other furniture. A double requires more space.

Usage: king single for kids, double for couples or guests

The pattern is consistent across retailers: king singles are marketed for children, teenagers, and single adults; doubles for couples or guest rooms where two sleepers may share.

Why this matters

A parent buying a bed for a growing child who is already 170 cm tall will find a double too short and a single too cramped. The king single solves both constraints without dominating the room.

The pattern: the king single is the only size that offers adult length in a compact width, making it the practical choice for tall kids and short adults who sleep alone.

What age is a king single bed for?

When to transition from single to king single?

Children typically outgrow a standard single around ages 7 to 9, depending on height. The king single is designed to accommodate them through the teenage growth spurt. Wise Move notes it’s a good option for growing children, especially teens.

What age group is it designed for?

The consensus is ages 8–14, but Sleepyhead adds that it’s also ideal for tall teenagers or as a spare bed for single adult guests. Sealy NZ lists it as suitable for “growing children, taller teenagers, and single adults.”

Is it worth getting a king single bed?

Benefits of king single

  • Extra length (203 cm) vs standard single (188 cm)—vital for teens hitting growth spurts
  • More affordable than a double bed—frames start around $300 NZD
  • Fits in smaller rooms—recommended room size 2.4 m x 3.0 m

Cost considerations

You can expect to pay $300–$800 NZD for a complete king single (frame + mattress), depending on materials and extra features like storage drawers. Sleepyhead and Sealy NZ both offer king single mattresses in foam and innerspring varieties, with prices in that range.

Space saving compared to double

A double bed takes up roughly 30 cm more width, which can make or break a small bedroom. The king single leaves room for a desk or wardrobe—a crucial factor for New Zealand homes where space is often tight.

Comparison table – How king single stacks up against single and double.

Bed size Width (cm) Length (cm) Best for Typical price range (frame + mattress)
Single 91–92 188–190 Children under 8–9 $200–$500 NZD
King Single 107 (or 105.5) 203 Children 8–14, tall teens, single adults $300–$800 NZD
Double 137 188 Couples or guest rooms $500–$1,200 NZD
Bottom line: The king single is what it actually is—a single bed stretched to fit taller sleepers without doubling the footprint. For parents of growing kids: it’s the most cost-effective way to delay a double purchase. For solo adults under 180 cm: it’s a comfortable space-saver.

Spec table – Detailed specs of a typical king single bed.

Specification Measurement / Detail
Standard mattress width (most brands) 107 cm
Standard mattress length 203 cm
Width (Sealy NZ) 105.5 cm
Length variation (all NZ brands) 203 cm (consistent)
Width vs single +15–16 cm
Length vs single +15 cm
Width vs double −30 cm
Length vs double +15 cm
Recommended room size (min) 2.4 m x 3.0 m (or 2.1 m without furniture)
Typical price (mattress only) $200–$500 NZD
Typical price (frame + mattress) $300–$800 NZD
Age suitability 8–14 years (extends to adult if under 180 cm)

Upsides

  • Extra length accommodates growth spurts
  • More affordable than a double
  • Fits compact NZ bedrooms
  • Widely available from major retailers

Downsides

  • Narrower than a double – unsuitable for two people
  • Standard single sheets may not fit (need specific king single bedding)
  • Brand width variation requires double-checking specs
  • Not ideal for adults above 180 cm (shoulder room may be tight)

The decision: the king single makes sense when length matters more than width, and when you’re buying for one person.

What we know and what’s still uncertain

Confirmed facts

  • Standard NZ king single dimensions: 107 x 203 cm (most sources)
  • Designed primarily for children and teenagers (Wise Move)
  • Same length as king and super king sizes (Sleepyhead)

What’s unclear

  • Exact optimal age for transition depends on child’s height and growth – not a fixed number
  • Some brands (e.g., Sealy NZ) use 105.5 cm width – always verify product specs before purchasing
  • Widely available at major retailers – specific stock varies by location and season

What experts and retailers say

King single mattresses are 107 cm wide and 203 cm long, matching NZ standards. It’s a perfect step up from a single for growing children and tall teenagers.

Sleepyhead – NZ mattress size guide

We recommend king single beds for children aged 8+ who need extra legroom. It bridges the gap between a single and a double without overwhelming the room.

Forty Winks – BedsRus size guide

The takeaway from both sources aligns: the king single is a practical transition bed. For a parent facing the question “is it time for a bigger bed?”, the answer is clear once the child’s height approaches the single’s 188 cm limit.

For New Zealand parents, the decision to buy a king single bed comes down to one number: the child’s current height. If they’re under 170 cm, a single still works. Once they cross that line, the king single becomes the smartest investment—it buys you another 3–5 years before you need a double, without sacrificing floor space. For the solo adult sleeper, the math is equally straightforward: if you’re under 180 cm and don’t need to share, the king single offers the best length-to-footprint ratio available in NZ.

Additional sources

en.wikipedia.org, 8hours.co.nz, thefoxesden.co.nz, nzbeds.co.nz, beds4u.co.nz

For a detailed breakdown of the exact measurements, check out this guide on king single bed dimensions in NZ.

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Frequently asked questions

What mattress thickness is best for a king single bed?

Most king single mattresses are 20–30 cm thick. A depth of 25 cm is standard and fits most bed frames. Always check the base’s maximum height allowance.

Can adults use a king single bed?

Yes, adults under about 180 cm can comfortably use a king single. For taller adults, shoulder room may be limited, but the length is sufficient.

Does a king single fit standard single sheets?

No. Standard single fitted sheets are too short (188 cm) and too narrow (91–92 cm). You’ll need specific king single bedding, widely available at NZ retailers.

Is a king single the same as a twin XL in the US?

Not exactly. US twin XL is 99 cm x 203 cm. NZ king single is 107 cm x 203 cm, so it’s wider. US sheets won’t fit correctly.

What bedding fits a king single bed?

Look for sheets labelled “king single” at stores like Farmers, Spotlight, or online. Do not buy standard single or double bedding.

How much space does a king single bed need?

Wise Move recommends a minimum room size of 2.4 m x 3.0 m. With no other furniture, a 2.1 m wide room can work.

Are king single beds suitable for guest rooms?

Yes, for single adult guests. If you host couples, a double or queen is better. For a spare room used by one person, the king single is a smart use of space.

What is the difference between a king single and a super single?

“Super single” is sometimes used interchangeably with king single in NZ, but technically a super single is 107 cm x 203 cm, the same dimensions. Always verify the retailer’s definition.

Related reading: Queen Size Bed Dimensions NZ · Beds R Us Hamilton Mattress Guide