Choosing a pillow loft for your neck and shoulders

SomniSmart editorial team · Updated October 27, 2026

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Loft is the height of a pillow under your head once you are lying on it. Too low and your head tips down; too high and your neck bends up. Getting loft right matters more than the fill or the brand name. Here is how to work out yours.

What the research shows

There are no universal, evidence-based rules for pillow height, a point researchers themselves make. What studies do show is that height changes the load on your head and neck:

In a lab study of 10 healthy adults lying on pillows 11, 13, 15 and 17 cm high, average pressure on the head was about 30% higher on the highest pillow than on the lowest, and computer modelling showed higher pillows increased neck extension and curvature^[1]. Pressure and alignment were height-specific, which supports choosing loft to fit your body.
In a field study of 106 people, more than half reported regular waking symptoms, uncomfortable pillows and/or poor sleep on their own pillow; poor sleep quality was linked to waking neck stiffness and shoulder-blade pain. The authors concluded that many people appeared to have made poor pillow choices^[2].

Both studies are small, so the guidance below is practical rule-of-thumb built on simple geometry: fill the gap between your head and the mattress so your neck stays in line with the rest of your spine.

Loft by sleeping position

These are the starting ranges the SomniSmart pillow quiz uses before it adjusts for your body and mattress:

Side sleepers: about 4.5–6 inches. Side sleeping leaves the biggest gap, roughly the width of your shoulder, so it needs the most loft.
Back sleepers: about 3.5–5 inches. Enough to support the curve of the neck without pushing your chin toward your chest.
Stomach sleepers: about 2–3.5 inches. As flat as possible to limit neck extension; some stomach sleepers do best with almost no pillow.
Combination sleepers: about 4–5.5 inches, ideally in an adjustable pillow so you can tune it.

Measure your shoulder gap

For side sleepers, the most useful number is the distance from the base of your neck to the outer edge of your shoulder. Stand straight, place a ruler at the side of your neck and measure across to the tip of the shoulder. That is roughly the gap your pillow needs to fill when you lie on a surface that does not give at all. Then adjust:

Mattress firmness: a soft mattress lets the shoulder sink about an inch, so you need less loft; a firm mattress keeps the shoulder higher, so you need a little more. The quiz subtracts about 1 inch for soft, half an inch for medium and nothing for firm.
Shoulder width: broad shoulders raise the loft you need on your side; narrow shoulders lower it.
Body weight: heavier sleepers compress the fill more, so start about half an inch higher; lighter sleepers start about half an inch lower.

Remember that loft is measured under your head. A fluffy pillow that looks 7 inches tall may compress to 4. Brands rarely publish compressed loft, which is why adjustable pillows, with removable fill or inserts, are a safer bet if you are between sizes.

Shoulder pain and side sleeping

If your shoulder hurts, the pillow and the mattress have to work together. A pillow that is too low drops your head and pushes your weight onto the shoulder; a mattress that is too firm leaves the shoulder jammed up toward your ear. A study of people with pain in one shoulder found most of them slept on the painful side^[3]. Try the other side, hug a second pillow so the top arm rests forward, and see our guide for side sleepers with hip or shoulder pain.

Fill and shape

Shredded foam or latex, adjustable: lets you add or remove fill to hit your loft.
Solid latex or memory foam: holds a consistent height all night. Contour (cervical) shapes have a higher front roll to support the neck curve.
Down and feather: soft and mouldable but compress a lot. In the study above, feather pillow users reported consistently lower pillow comfort and sleep quality^[2].
Sleeping hot: latex and ventilated or gel-infused foams tend to sleep cooler than solid memory foam.

Sized cervical pillows

Some cervical pillows come in sizes matched to your neck-to-shoulder measurement rather than one generic height. Spine Align (Chirobed), our own brand, makes the Therapeutica cervical pillow in sizes measured from the base of the neck to the tip of the shoulder, designed for back and side sleeping (not stomach sleeping). The pillow quiz suggests a size from your measurement.

How to test a pillow at home

Lie in your usual position and ask someone to take a photo from behind or from the side. On your side, your nose, chin and breastbone should line up roughly with the middle of your body, with no tilt of the head toward the mattress or toward the ceiling. On your back, your face should be roughly level and your chin should not be pushed toward your chest. Then give the pillow at least a week: neck muscles take a few nights to adapt, so judge it on how you feel in the morning, not in the first five minutes. If you sleep in several positions, test each one, and consider an adjustable pillow so you can remove or add fill until the photo looks straight.

Signs your loft is wrong

You wake with neck stiffness or pain between the shoulder blades.
You fold or bunch the pillow, or slide an arm under it, to raise your head.
Your shoulder or arm is numb or aching on the side you lie on.
Your pillow is more than a couple of years old and no longer springs back.

Not medical advice. This guide is general education. It does not diagnose, treat or cure any condition. Pain that is new, severe, getting worse, wakes you at night, or comes with numbness, weakness, fever or weight loss needs a clinician.

Find your pillow loft with the pillow quiz