King Mattresses

A standard king mattress size is 203 cm wide by 203 cm long, providing extra space for couples or individuals who prefer enough room to stretch out. If you need to save on space, consider a queen-size bed mattress, slightly narrower but the same length. 

Before purchasing, it's essential to measure your bed frame to ensure the king mattress size fits perfectly.

We don't recommend using our mattresses on an adjustable bed base, as if the mattress is bent or folded for extended periods of time you may end up causing damage to the core and supportive layers, which would not be covered under our Koala Warranty.

Our mattresses have been engineered to work best on a flat platform or slatted surface that allows adequate ventilation underneath. If you need to buy a new base, check out our range of bed bases. They're super sturdy, no tools required and easy to assemble!

We recommend spot-cleaning your king-size bed mattress with a mild detergent and a damp cloth for any stains or spills. Additionally, use a mattress protector to guard against allergens and moisture, extending the life of your mattress and maintaining its hygiene.

A king size mattress gives you room to stretch out like you are in a hotel, even when you share the bed every night. This collection of king size mattresses suits Aussie bedrooms of all shapes, from compact main rooms to large suites where the bed is the star of the space. You get a mix of contouring foam comfort, pressure relief for side and back sleepers, and steady edge support so every part of the king mattress size feels usable. Match your king bed mattress with Koala bedding and bedroom furniture for a sleep zone that looks calm and feels seriously comfy.

Shop King Size Mattresses For Bigger, Better Sleep

King Mattress Size Comfort For Every Sleeper

King size mattresses in this range focus on that balance between soft comfort and proper support. A King Size Mattress from Koala combines Kloudcell-style foam, zoned support and motion isolation so restless sleepers are less likely to wake their partner. Many people type in searches like best king size mattress for side sleepers with back pain, and this layout speaks directly to that need, with shoulder and hip cushioning that still holds your spine in a better line. Looking for a king size mattress that feels roomy, keeps the bed stable and helps you wake up less sore?

King Size Mattresses Made For Real Aussie Bedrooms

A modern king size mattress from Koala fits real homes, not just showroom layouts. The king bed mattress arrives in easy-to-handle boxes and is simple to move through lifts and tight hallways, then pops out to full size on your existing bed frame or base. Breathable foam, airflow channels and cool-to-touch fabrics help hot sleepers through sticky summer nights, and a medium-firm feel suits a mix of sleeping positions. This way, your king size mattresses work for couples with different sleep habits, tall sleepers who need more leg room and anyone who wants that hotel-style feel at home.

Shop similar collections: Mattresses | Queen Mattresses | Super King Mattresses | King Bed Bases | Bedding

King Bed Mattresses Backed By Koala Care

Koala king bed mattresses come with fast delivery, a 120-night trial and long warranties, so you can test the feel in your own room with plenty of time to decide. Koala uses thoughtfully chosen foams, low-VOC glues and timber from responsible sources across its range, so your king size mattress plays a part in a more planet-friendly bedroom. One short brand truth sits behind the whole collection: Koala wants Aussies to sleep better on products that feel good to live with and good to buy. From the first unboxing to years of use, these king size mattresses are built for easy setup, comfy nights and a bedroom that still works if you move, rearrange or refresh your style.