King Mattresses

King Bed Frames

King Bed Bases

King Bed Heads

King Bedroom Packages

King Bedroom Suites

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Super King Mattress

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Mattress Protectors for King Beds

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Enjoy a little more room to stretch out with a king mattress from Factory Buys. Our range includes innerspring, gel foam and latex foam mattresses, with different firmness levels, comfort layers and thicknesses to suit your preferences. Whether you're upgrading from a queen or replacing your existing king mattress, there are plenty of options to compare.

Factory Buys has been Australian owned and operated since 2016, with orders dispatched within 1 to 2 business days and products backed by a 12-month warranty. Explore our king mattresses alongside our wider mattress range.

Choosing the right base for your king mattress

A standard Australian king mattress measures approximately 183cm wide by 203cm long, so it's important to make sure your bed frame or base provides the right support. If you're keeping your existing frame, check that it's designed to accommodate a king mattress and that the slats or support platform are in good condition. Larger beds may require additional centre support, depending on the frame design and mattress construction.

Different mattress types can also have specific base requirements. Foam and hybrid mattresses, for example, may require particular slat spacing to provide even support across the sleeping surface.

Before ordering, review the mattress manufacturer's recommendations and compare them with your current setup. If you're replacing the frame as well, browse our king bed frames or explore king bed bases for a complete setup.

Compare different types of king mattresses

King mattresses come in several constructions, each offering a different combination of support and comfort. Understanding how they work can help you narrow down your options.

  • Pocket spring mattresses use individually wrapped springs that respond independently to movement. This can help reduce motion transfer across the mattress, making them worth considering if you share your bed. 

  • Memory foam mattresses offer a more contouring feel, with foam layers that respond to pressure and body shape. Some designs also feature gel-infused foam, which is intended to help manage heat within the comfort layers.

  • Hybrid mattresses combine a spring support system with foam or other comfort materials, while latex options generally provide a more responsive feel.

What king mattress firmness should you choose?

Mattress firmness is a personal preference, and the right feel depends on how you sleep, your body weight and the level of cushioning you find comfortable.

Medium-firm king mattresses are a popular option, offering a balance between cushioning and a more stable sleeping surface. Softer mattresses generally provide more give around the body, while firmer designs create a less cushioned feel.

Your usual sleeping position can also help guide your decision. Side sleepers may prefer additional cushioning around the shoulders and hips, while back and stomach sleepers may look for a more stable surface.

If you're sharing your king mattress, consider both sleepers' preferences before making a choice. It's also worth comparing features such as reinforced edges and comfort layers, which can affect how the mattress feels across the sleeping surface.

Does king mattress thickness matter?

King mattresses come in different thicknesses, with options across the Factory Buys range measuring approximately 15cm to 37cm deep. A thicker mattress may include additional comfort layers, but thickness alone doesn't determine how firm or supportive it will feel. 

Mattress depth can also affect the overall height of your bed. If you're using an existing frame or base, check how the mattress will sit alongside your bedside tables and other bedroom furniture.

It's worth considering your bedding too. Deeper mattresses may require fitted sheets with a deeper wall, along with a king mattress protector that accommodates the full mattress depth.

Why shop at Factory Buys?

Replacing a king mattress is a significant bedroom purchase, so having different constructions and comfort options to compare can make the decision easier. Factory Buys brings together king mattresses across a range of firmness levels, materials and price points, with detailed product specifications to help you find the right fit for your existing bed or a completely new setup.

We've been selling mattresses direct to Australian customers since 2016, and our team is available seven days a week if you need help narrowing down your options. Afterpay, Zip and Klarna are also available at checkout, giving you different ways to manage the cost of your new mattress.

 

King Mattress FAQ

What size is a king mattress in Australia?

A standard Australian king mattress measures approximately 183cm wide by 203cm long. That's around 30cm wider than a queen mattress, while both sizes have the same length. The complete bed frame will generally be larger than the mattress, so check its external dimensions when measuring your bedroom.

Does a king mattress need centre support?

Many king bed frames require additional centre support to help distribute weight evenly across the mattress. The exact requirements depend on the frame, base and mattress construction. Check the manufacturer's recommendations for centre support and slat spacing before pairing a new king mattress with an existing bed frame.

Which king mattress is best for couples?

The best king mattress for couples depends on both sleepers' comfort preferences. Pocket spring mattresses can help reduce motion transfer because the springs move independently, while memory foam designs provide a more contouring feel. It's also worth considering mattress firmness, edge support and how much movement can be felt across the bed.

How thick should a king mattress be?

King mattresses are available in different thicknesses, with many designs measuring around 25cm to 35cm deep. The right thickness depends on the mattress construction, your preferred feel and the overall height of your bed. A thicker mattress isn't necessarily more supportive, so compare the materials and comfort layers as well as the depth.

Is a king mattress too big for a standard bedroom?

A king mattress can fit comfortably in many main bedrooms, but the available space and layout are important. Measure the external dimensions of your bed frame and allow enough clearance to move around the room, open wardrobes and access bedside furniture. If space is limited, a queen mattress may be worth considering.