Choosing the Right Bed Size: A Comprehensive Guide for a Restful Night’s Sleep in Australia

Australian adjustable beds range from Long Single (92cm × 203cm) for one sleeper up to Split Cali King (two 107cm × 203cm sections) for couples wanting maximum space. Measure your room first, then match the size to who's sleeping in it — split sizes (Split Queen, Split King, Split Cali King) let couples each choose their own position independently.

Australian bed sizes aren't the same as the US or UK sizes you'll see quoted online, and an adjustable base adds one more variable: whether you want a single mattress the whole household shares, or a split base with two mattresses and two remotes. This guide covers the confirmed Australian dimensions, how to measure before you order, and which size actually suits your sleeping arrangement. For the wider decision — motor type, mattress layers, warranty and the rest — see our practical buying guide to adjustable beds.

How do you measure your room and bed frame before choosing?

Start with the room, not the bed. Measure the floor space you actually have, then subtract clearance: leave comfortable walking space down each side you'll get in from, and check your installer's clearance guidance for the base to sit flat when it's raised or in a lounge position, and don't push the head of the bed hard against a wall if you'll want power points or a bedside table within reach. Check doorway and hallway widths too, since a Queen, King or Split Cali King base can be awkward to turn through a narrow corridor on delivery day.

If you're planning to move an existing mattress onto a new adjustable base rather than ordering a new one, check compatibility before you commit. A traditional inner-spring mattress is built to lie flat — a single bend can permanently ruin the internal spring structure, so it isn't a candidate for a base that lifts and folds. Sophie's own four-layer Australian-made mattress is built for that movement from day one, which is why every size in the range ships with one included rather than leaving you to source a compatible mattress separately. It's also worth comparing an adjustable base against a standard frame more broadly if you haven't already — our guide on adjustable beds vs traditional bed frames covers that decision in full.

What are the confirmed Australian adjustable bed sizes?

All lengths are 203cm except the Double, which is 187cm.

Size	Dimensions	Typical use
Long Single	92cm x 203cm	One sleeper, smaller room
King Single	107cm x 203cm	One sleeper wanting more width
Double	137cm x 187cm	Two sleepers sharing, smaller room
Queen	154cm x 203cm	Two sleepers sharing, one mattress
Split Queen	2 x (77cm x 203cm)	Two sleepers, independent positions
King	184cm x 203cm	Two sleepers sharing, one mattress
Split King	2 x (92cm x 203cm)	Two sleepers, independent positions
Split Cali King	2 x (107cm x 203cm)	Two sleepers, maximum width

Every size includes the same four-layer Australian-made mattress and free Australia-wide delivery and installation — the size changes the footprint, not what comes with it (source: confirmed size and inclusion figures, Sleep Sophie product specifications).

What size suits one sleeper?

Long Single size (92cm x 203cm)

The Long Single (92cm x 203cm) is the smallest footprint in the range and suits a single bedroom, guest room, or anyone who wants an adjustable bed without giving up floor space. "Long" refers to the full 203cm length — the same length as every size except the Double — so a taller sleeper isn't compromising on legroom to save width.

King Single size (107cm x 203cm)

The King Single (107cm x 203cm) adds 15cm of width over the Long Single at the same 203cm length. It's a common choice for anyone who wants extra room to move without the footprint of a Double or Queen, and it still fits comfortably in most single bedrooms.

What size suits two people who want to share a mattress?

Double size (137cm x 187cm)

The Double (137cm x 187cm), also known as a three-quarter (3/4) bed, is the shortest bed in the range at 187cm rather than 203cm, and the narrowest option built for two people sharing one mattress. It suits a smaller bedroom where a Queen won't fit, but two adults sharing a single mattress and a single remote will be positioning the whole bed together, not independently.

Queen size (154cm x 203cm)

The Queen (154cm x 203cm) is one of the more widely chosen sizes for couples in Australia. As a single-mattress, single-remote base it gives two sleepers a genuinely spacious shared surface at the full 203cm length — and it's also available as a Split Queen, covered below, for couples who'd rather set their own positions.

What size suits couples who each want their own remote and mattress?

A Split Queen, Split King or Split Cali King replaces the single mattress with two independent mattress halves, each on its own motorised section with its own remote. One partner can sit up and read while the other lies flat, and neither has to feel the other's side of the bed move. This is the same independent-positioning setup behind the difference between full-electric and semi-electric bases — if you're also weighing up motor types, our comparison of full-electric vs semi-electric adjustable beds is the natural next read.

King size (184cm x 203cm)

The Split King (2 x 92cm x 203cm) sits at the same overall footprint as a standard King, and the King (184cm x 203cm) is available as either the Split King or a single-mattress Full King, depending on whether independent positioning matters to you.

Split Cali King size (2 x 107cm x 203cm, 214cm across)

The Split Cali King (2 x 107cm x 203cm, 214cm across) is the largest option in the range, wider than it is long, and it's only available as a split base with two mattresses and two remotes. It suits couples with a larger main bedroom who want maximum shared width alongside fully independent positioning.

Does a bigger adjustable bed cost or weigh more to consider?

The weight rating stays the same across the standard range: every size, from Long Single to Split Cali King, carries a 320kg rating (check the specific product page for the exact figure on your chosen model). For split sizes, ask us how the rating applies across the two bases for your combined household.

On cost, larger and split sizes naturally use more materials and components than a Long Single, so price does scale with size. Sleep Sophie offers interest-free payment options through Humm, Brighte and Payright, including no-deposit options for approved purchasers with a choice of repayment terms — see our guide to financing an adjustable bed in Australia for how that works before you compare sizes against budget.

Choosing the right size comes down to two questions: how much floor space have you actually got, and does everyone sleeping in the bed want to move independently or together? Once you know the answers, the Australian size table above should point to one or two realistic options rather than the full range.

The most reliable way to check a size against your own room is to see it in person. Sleep Sophie's free in-home demonstration brings the actual bed to your actual bedroom, Australia-wide, so you can confirm the fit and the feel before ordering — no obligation either way.