What Size is a Double Bed Mattress? Everything You Need to Know Before Buying

Introduction

• An Australian Double mattress measures 138 x 188 cm, sitting between King Single and Queen.
• Double works well for solo sleepers, teens, and guest rooms, but is tight for two adults long-term.
• Australian Double dimensions differ slightly from US ""full"" and UK ""double"" sizes, so overseas bedding may not fit well.
• If you are over 180 cm tall, sharing the bed nightly, or sleep hot, sizing up to a Queen is usually worth it.
• Most Australian brands stick to standard sizes, but always confirm exact dimensions before buying mattresses or sheets.

In Australia, mattress sizing can be particularly confusing if you’ve been browsing overseas retailers or comparing online deals. Terms like “double” or “full” can mean different things depending on the country, so it’s important to know exactly what you’re getting. If you want to know the double bed mattress size in Australia and want to compare it to the sizes in the US or UK, this blog is the right place to start.

A double bed is one of Australia’s most popular choices for singles who want extra space, teens upgrading from a single, and even couples. But before you buy, it’s worth understanding double mattress dimensions, how to choose the best Australian mattress, and which size fits your lifestyle. Because the wrong size can lead to wasted money and poor sleep.

By the end of this guide, you’ll know whether a double mattress is the right size for your body, your room, and your lifestyle — or if you should size up to a queen.

What Is a Double Bed Mattress?

In Australia, a double bed mattress (also called a “full-size mattress” in some other countries)is is one of the most popular mattress sizes in Australia for solo sleepers and guest rooms. 

The standard double mattress size is 138 cm wide × 188 cm long (54 inches × 74 inches). A double bed mattress is wider than a single or king single, making it more comfortable for one person to stretch out, or for two people to share in a pinch.

These measurements are industry-standard across most Australian mattress brands, including DuuDuu.

Australian Mattress Size Comparison Table

Refer to this elaborate Australian mattress size chart before you invest in a mattress:

Double vs. Other Sizes

A double mattress sits right in the middle of the size spectrum, offering more width than a single or king single but taking up less space than a queen or king. 

A double mattress may not be ideal if you:
1. Share the bed every night
2. Are over 180 cm tall
3. Toss and turn or sleep hot
4. Want long-term comfort rather than a temporary solution

Double vs queen bed size:

When stacked against a queen, the double is 15 cm narrower and 15 cm shorter, making the queen a better choice for couples who value personal space. For those who want maximum sleeping area, the king and super king provide luxury proportions, but require larger bedrooms. 

In short, a double is ideal for singles wanting more room than a single bed allows, guest rooms, or occasional couple use, but may feel snug for two people long term.

Benefits of Knowing the Correct Size

Imagine wrestling with fitted sheets that don’t fit, knocking your shins on the bed frame, or squeezing into a space that feels more like a swag than a bed. Knowing your Australian mattress sizes is very important. Here’s why:

1. Save money & hassle 

You can avoid returns, exchanges, and the headache of buying the wrong fit just by knowing the Australian mattress sizes.

2. Perfect room fit

If you don’t know the mattress sizes, how would you determine if you should go for a standard double mattress size or a queen or a king! Whether it’s a compact city flat or a roomy suburban bedroom, knowing the right mattress and bed size can help you make the most out of your space.

3. Better sleep quality

Choosing the right size mattress reduces sleep interruptions, improves spinal alignment, and helps you wake up less stiff.

4. Match to lifestyle

It is important to know your Australian mattress dimensions to match it to your lifestyle. Pick a size that works for solo sleeping, sharing with a partner, or hosting guests - whatever you need.

Avoid “swag” syndrome. Steer clear of beds that feel cramped and leave you tossing and turning. 

Conclusion

Once you’ve chosen the right size, the next decision is support. Even the correct mattress size won’t help if it doesn’t keep your spine aligned or relieve pressure points — especially for back and neck comfort.

Shop for the best Australian mattress from DuuDuu.

DuuDuu’s medium-firm hybrid mattress is designed for Australians who want spinal support without sacrificing comfort — ideal for back sleepers, combination sleepers, and anyone upgrading from a worn-out mattress.

If a double mattress suits your space but you don’t want to compromise on support, DuuDuu’s Australian-made hybrid mattress offers pressure relief, cooling comfort, and long-term durability.

Use Coupon Code: WELCOME50 for $50 off your first mattress purchase. 

www.duuduu.com.au

FAQ 

1. Is a double mattress big enough for two adults?

A double mattress can fit two adults occasionally, but for nightly use most couples find it too narrow. It’s better suited to solo sleepers, teens, or guest rooms.

2. What bedding fits a double mattress?

Standard Australian double sheets and doona covers will fit. Bedding from Sheridan and Adairs will suit DuuDuu double-size mattress. Always check depth measurements for fitted sheets to match your mattress thickness.

3. How is an Australian double different from the US/UK double?

An Australian double is slightly shorter than the US “full-size” and UK “double.” Dimensions differ by a few centimetres, so bedding from overseas may not fit perfectly.

4. Do all brands follow the same measurements?

Most Australian brands stick to the standard sizes, but there might be small variations. Always check the exact dimensions before buying a mattress or bedding.

5. What is the Australian king-size mattress measurement?

An Australian king-size mattress typically measures 183 cm × 203 cm. It’s the same length as a queen but 30 cm wider, giving couples extra personal space.