Mattress Thickness: How Thick Should It Be? (2026)

Scroll through mattress listings and one number keeps changing: thickness. Some beds are a slim 18 cm, others a towering 33 cm, and it is tempting to assume the taller one is better. It is not that simple. Thickness affects comfort, support, how easily you climb in and out, and even which sheets will fit. Understanding what those centimetres are actually made of matters far more than the number on the label. Here is how to read mattress thickness and pick the right height for you.

Typical thickness ranges

Mattresses sold in Singapore generally run from about 15 cm to 35 cm (6 to 14 in), occasionally more for luxury models. It helps to think in broad bands rather than exact figures, because what suits you depends on your body and how the layers are arranged.

These bands overlap and brands measure differently, so treat them as a guide rather than strict rules. A well-built 22 cm mattress can outperform a poorly built 30 cm one every time. Note too that the same model is often sold in a couple of thickness options, so you can sometimes pick the height that suits your frame and body without changing the feel you liked in the showroom.

Thickness is not the same as quality

This is the most important point in the whole guide. A thicker mattress is not automatically a better one. Extra height only helps if it is filled with quality materials. A tall mattress padded out with cheap filler foam can sag faster and support you worse than a thinner, well-engineered bed.

What you are really paying for is the combination of a good support core and enough comfort material on top. Two mattresses of the same height can feel completely different depending on how that height is divided. So when you see a thickness figure, ask what it is made of, not just how big it is.

Support core versus comfort layers

Every mattress splits its height into two jobs. The support core, the springs or firm base foam at the bottom, keeps your spine aligned and stops you sinking too far. The comfort layers on top, softer foam or padding, cushion your shoulders and hips and relieve pressure.

A bed needs both. Too little support core and you sag; too little comfort layer and it feels hard. As mattresses get thicker, the extra centimetres usually go into deeper comfort layers, which is why plush and pillow-top beds feel softer and more cushioned. If the construction inside interests you, our guide to foam versus hybrid versus spring mattresses explains how different builds stack their layers, and how those layers translate into the feel underfoot.

Body weight and sleeping position

Your body decides a lot about the right thickness. Heavier sleepers press deeper into a mattress, so they usually benefit from a thicker bed with more substantial comfort and support layers that will not bottom out. Lighter sleepers sit higher on the surface and can be comfortable on thinner mattresses that feel too firm to a heavier person.

Position matters too. Side sleepers put their weight on shoulders and hips and generally want more cushioning, so thicker plush layers help them. Back and stomach sleepers often prefer a firmer, thinner feel that keeps them from sinking. There is no single correct number; match the thickness to how much give your body and position need.

Bed height and getting in and out

Thickness does not just change comfort, it changes how high your bed sits. Add a thick mattress to a tall frame and the sleeping surface can end up higher than you expect. That can look grand, but a very high bed is awkward to climb into and out of, especially for children, older adults or anyone with mobility concerns.

A thin mattress on a low platform sits close to the floor, easy to get in and out of but potentially too firm. A thick mattress on a storage frame can perch quite high. Think about the total: frame height plus mattress thickness equals how far you climb every night. If you are choosing a base, our guide on how to choose a bed frame covers matching frame height to your mattress.

Storage and platform frames

The type of frame you own interacts with thickness in ways worth planning. Storage beds, which lift up or have drawers, tend to sit taller to fit the storage underneath. Put a thick mattress on top and the bed can become very high. A slimmer mattress can balance that out.

Platform frames sit lower and pair happily with thicker mattresses, since the low base offsets the extra mattress height. If you are weighing a storage base, adding up the base height and mattress thickness helps you picture the final sleeping height before you commit. Measure, add the numbers, and imagine sitting on the edge with your feet on the floor.

Sheets, toppers and adjusting the feel

Thickness affects your bedding too. Standard fitted sheets are cut to fit mattresses up to about 25 to 30 cm (10 to 12 in) deep. Go thicker than that, or add a topper, and you will likely need deep-pocket fitted sheets so they stay tucked and do not ping off in the night. Check the sheet’s stated pocket depth against your mattress before buying, as this is an easy detail to overlook.

If your mattress is not quite the feel you want, a mattress topper is a flexible fix. A topper adds roughly 5 to 8 cm (2 to 3 in) and can soften a firm bed or revive an ageing one without buying new. Just remember it raises the total height, which may tip you into deep-pocket sheet territory. It is a cheaper way to tune thickness and feel than replacing the whole mattress.

The bottom line

Mattress thickness runs from about 15 cm for basic beds to 35 cm or more for plush, pillow-top luxury models, but the number alone tells you little. What matters is how that height is split between a supportive core and comfort layers, and whether the materials are any good. Heavier and side sleepers usually want thicker comfort layers; lighter and back sleepers can go slimmer. Factor in your frame, since frame plus mattress sets how high you climb each night, and remember that anything above roughly 30 cm may call for deep-pocket sheets. A topper offers an easy way to fine-tune the feel. Match thickness to your body, your bed and your bedding rather than chasing the tallest option, and plan the rest of the room with the wider furniture guides.