Pillow height · Updated September 2026
Best Pillow Height for Back Sleepers
On your back the gap to fill is small — just the hollow behind your neck — so the useful starting range is about 3 to 5 inches. The failure mode here is almost always too much pillow rather than too little: a tall pillow tips your head forward and holds your chin toward your chest all night.
What a back sleeper's pillow has to do
Lying on your back, your head naturally rests close to the mattress and your neck curves away from it. The pillow's job is to fill that curve so the neck muscles are not holding the head up, while letting the back of your head settle rather than pushing it forward.
That is why shaped and contoured pillows are popular with back sleepers: a raised ridge under the neck with a lower hollow for the head matches the shape of the gap more closely than a flat rectangle.
Set your starting height
| Your setup | Starting loft to test |
|---|---|
| Plush mattress — head already sinks in | Around 3 inches |
| Medium mattress | Around 3.5 to 4.5 inches |
| Firm mattress | Around 4.5 to 5 inches |
| Back sleeper who also turns onto their side | Adjustable, set to the side-sleeping height |
The chin test
Lie on your back and look straight up without moving your head. If your gaze lands on the ceiling directly above you, the height is close. If you are looking at the wall opposite your feet, the pillow is too tall.
The home test is simple and needs another person or a phone propped on a shelf: lie down in your usual position on your usual mattress, get settled for a minute, and take a photo from behind. Your nose should line up with the centre of your chest, and the line of your neck should continue the line of your spine rather than kinking up or down.
A knee pillow does more than you expect
Back sleepers who flatten out against the mattress often find a small pillow under the knees more comfortable than any change to the head pillow, because it lets the lower back settle. It costs little and it is worth trying before spending more on the head end.
A badly matched pillow can leave you stiff in the morning, and fixing the fit is worth doing. But neck pain that lasts beyond a couple of weeks, pain that wakes you, or pain with numbness, tingling or weakness in an arm is not a bedding problem — that is worth raising with a clinician.