The four MAPS factors
Many pillow guides start with a fixed height for every side, back, or stomach sleeper. That is a useful first clue, but it leaves out the bed and the person lying on it. MAPS names four separate inputs so you can see why the same pillow may fit differently in two bedrooms.
Mattress
How far your shoulder or upper body sinks where you actually sleep.A soft label or firmness number is only a clue. What matters is how your body settles into that specific mattress.
Anatomy
The shape and spacing of your head, neck, and shoulders.Shoulder width can matter on your side, but height or body weight alone cannot tell us the gap your pillow must fill.
Position
The way you usually sleep: side, back, stomach, or a mix.Position changes which body surfaces meet the bed and how the other three factors should be interpreted.
Support
What the pillow delivers when your head is resting on it.Its working height, shape, and ability to hold support matter more than its unloaded height on a product page.
Body weight is not a fifth factor. It can affect how far a person sinks into a mattress and how much a pillow compresses, but a weight category by itself does not specify the required pillow height.
The pillow fit formula
MAPS is a decision framework, not four percentages added together. Position selects the kind of support to examine. Anatomy and the mattress define a target range. The pillow's support under load is then compared with that target.
In shorthand: fit = how closely the pillow's working support matches the support needed on your bed. The outcome is a range and a practical check, not a universal number of inches. A visual alignment check can catch a mismatch that an estimate misses.
Example: choosing a pillow for side sleeping
On your side, the pillow has to support the head above the mattress beside your shoulder. A broader shoulder may create a larger gap. When that shoulder sinks into the mattress, the gap may become smaller. The pillow must still hold enough height after your head compresses it. This is where Anatomy and Mattress are especially informative; Position tells us why those measurements matter.
Same sleeper. Different mattress. Different pillow height to try.
Watch what changes when the shoulder settles farther into the bed.
More space remains between the head and mattress.
The shoulder lowers, so the space to fill may shrink.
This is an explanatory approximation, not a measurement prescription. Shoulder posture, head shape, where you place the pillow, and the mattress under the pillow can all change the result. A direct check on your own bed is better than estimating from shoulder width alone.
| Same sleeper | What may change | What to check |
|---|---|---|
| On a firmer mattress | The shoulder may sink less, leaving more space beside the head. | Does the pillow hold enough height under the head without tilting it upward? |
| On a more yielding mattress | The shoulder may sink farther, reducing that space. | Does the same pillow now lift the head too far? |
Mattress labels are imperfect proxies: compare your actual position and sink rather than assuming that every “soft” or “firm” mattress behaves alike. See our full side-sleeper guide for the practical fit checks.
How MAPS changes on your back or stomach
On your back, the lateral shoulder gap is no longer the right formula. Look at how the back of your head and upper body settle into the bed, how the neck is supported, and whether the pillow pushes the chin noticeably toward the chest or leaves the head tipped back. Mattress behavior still matters, but in a different way from shoulder immersion on your side. Read our back-sleeper guide.
On your stomach, head height and neck rotation deserve particular caution. Start with low support if you use a pillow under your head; an extra-thick pillow can add to the turn and extension already present in this position. No pillow formula removes the rotation created by sleeping face-down. See our stomach-sleeper guide.
If you switch positions, check each position you use often. A pillow that seems excellent on your side but clearly pushes your chin down on your back should not receive a reassuring “average” fit label without that trade-off being shown.
Try MAPS on your own bed
- Choose your usual position. If you move often, repeat the check in the two positions you use most.
- Notice your anatomy and mattress together. On your side, look at the space beside your shoulder after it settles into the bed. On your back, notice the relation between your head, neck, and upper body.
- Lie on the pillow for a few minutes. Judge its working height after compression, not the height of an untouched pillow.
- Check for an obvious tilt. On your side, ask someone to view your head in relation to your upper back, or take a consistent photo. On your back, notice chin tuck or chin lift. Comfort matters too; a photograph cannot diagnose neck health.
- Adjust and repeat. If the fill is adjustable, record what you changed. If you change mattresses, repeat the check because the same pillow may now fit differently.
Our current 60-second quiz is a quick starting point. It does not yet measure shoulder sink or a particular pillow's loaded height, so its result should not be described as a full MAPS score.
What MAPS does not measure
MAPS focuses on physical fit. It does not, by itself, tell you whether a pillow sleeps hot, survives repeated washing, lasts for years, offers good value, or suits your preferred feel. Those belong in a separate product evaluation. A pillow can fit your height needs and still be a poor choice for other reasons.
We have not published numerical MAPS scores or completed product tests. A future score would require a repeatable way to measure the person–mattress gap and the pillow's loaded support, a rule for missing information, and validation across different bodies and beds. We will publish those rules before assigning product scores. Until then, “unknown” means we have not measured it; it does not mean the pillow is bad.
Who created MAPS?
Hugo Feruglio, co-founder of Find Best Pillow, developed MAPS as the site's editorial framework for explaining pillow fit. Years of neck discomfort led him to pay closer attention to how sleep position, body shape, mattresses, and pillows interact. His experience explains the project's focus; it is not a medical credential.
MAPS is our original way of organizing these questions. The underlying biomechanical observations come from existing research and are credited below. This page is the canonical explanation of the framework and will show meaningful revisions with dates. You may refer readers to it as “the MAPS pillow fit framework by Hugo Feruglio, FindBestPillow.”
Evidence and limits
Research supports examining pillow height, body dimensions, contact pressure, and mattress properties together. It does not establish a universal four-factor weight or a single ideal height for everyone. Some studies below are small or use laboratory models. We use them as background for questions to test, not as proof that MAPS prevents pain.
- Ren et al. — pillow height, head–neck pressure, and alignmentSmall experimental study and model; supports the relevance of height, not a universal optimum.
- Individualized pillow height for side sleepersSmall study linking body dimensions and lateral cervical measures; not a population-wide formula.
- Mattress stiffness and spinal curvatureShows why the mattress belongs in a pillow-fit discussion, especially for the position studied.
- Review of pillow-height determinantsSummarizes alignment, body dimensions, pressure, and muscle activity; notes the evidence gaps.
- Mattress support in side sleepingExplores shoulder-zone support and spinal alignment on different surfaces.
For product measurements we have planned but not yet completed, read our testing protocol. For concerns about persistent or worsening pain, seek advice from an appropriate clinician.