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Loft is how tall a pillow stands once your head is resting on it. Makers often print a height for the pillow at rest, straight out of the bag, but your neck lives with the height that survives the weight of your head. Two pillows sold at the same height can end up far apart by morning, because soft down gives way under a head while a dense foam block barely moves.
The clinical sources we read agree on the aim: a neck kept level with the rest of your spine. How much pillow that takes depends on three things, which are the position you sleep in, the width of your shoulders and the bed underneath you.
The basics
What loft means and why it changes overnight
Loft has two parts. There is the height of the pillow as it arrives, and there is how much of that height is left with your head on it. Down and polyester fiber give up a large share of their height under load, while a solid memory foam or latex core keeps most of its shape.
Loose fill also moves during the night. Turn over a few times and the fill drifts away from the spot under your neck, so a pillow that felt right at bedtime can sit lower by the small hours. Adjustable pillows let you take fill out or put it back, the most direct way to match loft to your own frame. Our ranking of adjustable pillows sorts them by buyer score.
Side sleepers
Side sleepers need the most height
Lying on your side opens a gap between your ear and the mattress close to the width of your shoulder. The pillow has to fill that gap. Leave it half empty and your head tips toward the bed, bending your neck sideways for hours.
Clinicians quoted by Harvard Health say side sleepers need a firmer pillow, while back and stomach sleepers may want thinner, softer ones. A second Harvard Health article suggests a pillow that sits higher under your neck than under your head when you lie on your side. Mayo Clinic adds a pillow between the knees, with the legs drawn up, so your hips and spine line up below the neck as well.
Broad shoulders call for more loft than narrow ones. If you are tall with a wide frame, start at the top of the side-sleeper range and work down. Our list of pillows for side sleepers ranks the candidates by score.
Back sleepers
Back sleepers sit in the middle
On your back, the pillow only has to fill the curve behind your neck and hold your head level. Too much height pushes your chin toward your chest. With too little, your head falls back and your chin points at the headboard.
Mayo Clinic's advice for back sleepers is a pillow that keeps the neck in line with the chest and back, with another pillow under the knees. Harvard Health describes a rounded support under the neck and a flatter pillow under the head, which is the shape contour pillows are built around. In practice that means a medium loft that does not sink to nothing under the back of your skull.
Stomach sleepers
Stomach sleepers need the least
Face down, your head turns to one side, and any height under it bends your neck backward. Stomach sleepers usually do best with a thin, soft pillow, and some prefer none at all under the head.
Harvard Health calls stomach sleeping tough on the spine, and the NHS advice for preventing neck pain includes not sleeping on your front. Mayo Clinic's suggestion, if you can't change position, is a pillow under your hips and lower stomach. Our stomach sleeper list collects the low-loft options buyers rate highest.
Plenty of people change position through the night. Size the pillow for the position you spend longest in, or choose a fill you can push thinner on one side and leave fuller on the other.
Your mattress
A softer mattress means a lower pillow
Your mattress changes the math more than most people expect. On a soft mattress or a pillow-top, your shoulder sinks into the bed, the gap between ear and mattress shrinks, and a side sleeper needs less loft. A firm mattress keeps the shoulder high, and the same sleeper needs more.
A chiropractor writing for the Cleveland Clinic puts it as a rule of thumb: a firmer mattress usually calls for a thicker pillow, a softer one for a thinner pillow. He also says the pillow should keep your neck parallel to the mattress. So a new mattress is a reason to rethink your pillow, even one bought a few months ago.
Body weight works the same way. A heavier sleeper sinks further into both the mattress and the pillow, and a fill that compresses a lot may need extra height at the start to end up level.
Starting ranges
Typical loft ranges, as a place to start
The heights in the table are our rule of thumb for loft under your head. They are a starting range, not a medical standard, and no study we read sets an ideal number. A 2021 review in the journal Healthcare went through the research on pillow height back to 1997 and found no firm conclusions on the best height for back or side sleeping.
A second 2021 review, in Clinical Biomechanics, pooled nine high-quality trials. Pillow design did not change sleep quality in people with chronic neck pain, and shape and height seemed to matter more for alignment than the fill inside. Read the ranges as a first guess, then let your own neck settle the last inch.
| Sleep position | Our starting range (loft under your head) | Go higher if | Go lower if |
|---|---|---|---|
| Stomach | 2 to 3 in | You often roll partway onto your side | Your neck arches back when your head turns |
| Back | 3 to 5 in | You have broad shoulders or a firm mattress | Your chin tips toward your chest |
| Side | 4 to 6 in | Your shoulders are broad or your mattress is firm | Your mattress is soft or has a pillow-top |
| Combination | Adjustable fill, set for your main position | Most of your night is spent on your side | Most of your night is spent on your front |
Self-check
Check your own alignment in two minutes
The fit is easy to judge without any equipment. Lie down in your usual position, on your own bed, with the pillow in question. Then ask someone to look at you from behind if you sleep on your side, or from the side if you sleep on your back. Your neck should run in a straight line from between your shoulders to the back of your head.
- On your side: the bridge of your nose lines up with the middle of your chest. A head tilted toward the mattress means the pillow is too low, and one tilted toward the ceiling means it is too high.
- On your back: your chin sits level, neither pressed toward your chest nor pointing at the headboard.
- On your front: your neck stays close to flat as your head turns. If it arches back, try less pillow or none.
- After ten minutes, look again. Loose fills settle, and a pillow that looked right at first can sag.
Limits
What a pillow can and can't do
Do the check on your own mattress. A store bed, a hotel bed or a sofa gives a different answer, for the same reason a new mattress changes your loft.
A pillow is about comfort and position. Clinicians quoted by Harvard Health say its benefits go little beyond that, and the NHS advises seeing a doctor if neck pain lasts more than a few weeks. Ongoing pain is a reason to see a clinician, not to keep buying pillows.
Questions
Questions buyers ask
How can you tell if your pillow is too high?
On your side, your head tilts toward the ceiling and your upper ear sits well above the line of your spine. Lying on your back, your chin is pushed toward your chest. Ask someone to look while you lie in your usual position, or take some fill out and compare.
Do you need a lower pillow after switching to a softer mattress?
Usually, if you sleep on your side. A softer mattress lets your shoulder sink, which narrows the gap the pillow has to fill. The Cleveland Clinic's rule of thumb is a thinner pillow on a softer bed and a thicker one on a firmer bed.
What loft works if you change positions during the night?
Pick the loft for the position you spend the most time in, or choose an adjustable pillow and set it between the two. Shredded foam and loose fiber can be pushed to one side, so part of the pillow sits higher than the rest.
Can the right pillow height fix your neck pain?
No pillow is a treatment. Clinicians quoted by Harvard Health say a pillow's benefits go little beyond comfort and positioning. A 2021 review found that pillow design did not change sleep quality in people with chronic neck pain. If pain lasts more than a few weeks, the NHS advises seeing a doctor.
