Start with the position you sleep in most, then adjust for your body weight and whether you need more cushioning or more resistance to sinking. As a broad guide, side sleepers often start between medium-soft and medium-firm, back sleepers between medium-firm and firm, and stomach sleepers at firm. These are starting ranges—not guarantees—because firmness labels and mattress construction vary.
Firmness and support are related, but not the same
Firmness describes how soft or hard the mattress feels at its surface. Support is how well the mattress holds your body and limits excessive sinking; it depends substantially on the support core, while the comfort layers shape the surface feel. A mattress can feel soft while still providing support, or feel firm without being comfortable for your body.
Manufacturers do not use one universal firmness measurement. A number on a 1–10 scale is a rough comparison aid, not a promise that two brands’ mattresses will feel alike. Memory foam’s thickness and degree of conformity also affect the feel: thicker, more conforming comfort layers tend to feel softer, while thinner or less malleable layers tend to feel firmer. Sleep Foundation’s firmness guide explains these distinctions.
Use sleep position and body weight to find a starting range
The ranges below come from Sleep Foundation’s mattress firmness guide, updated July 25, 2025. Its 1–10 ratings and weight bands are recommendations, not medical thresholds or population statistics. Use them to narrow your options, not as precise cross-brand specifications.
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| Sleep position | Under 130 lb | 130–230 lb | Over 230 lb | What to look for |
|---|---|---|---|---|
| Side | Soft (3) to medium (5) | Medium-soft (4) to medium (5) | Medium-firm (6) to firm (7) | Cushioning at the hips and shoulders without excessive sink. |
| Back | Soft (3) to medium (5) | Medium (5) to firm (7) | Firm (7–8) to extra firm (9) | Enough resistance to limit midsection sag, with some contouring. |
| Stomach | Medium-soft (4) to medium-firm (6) | Medium (5) to firm (7) | Firm (7–8) to extra firm (9) | Firmer support that helps limit sinking through the middle. |
| Combination | Soft (3) to medium (5) | Medium-soft (4) to medium-firm (6) | Firm (7–8) | Start with the position you occupy most often; consider ease of movement, too. |
If you mostly sleep on your side
Your hips and shoulders press into the mattress, so too firm a surface may feel uncomfortable at those points. Too soft a surface can let you sink excessively. Look for enough cushioning to contour around those areas while keeping your body from settling too deeply. Sleep Foundation’s separate shopping guide gives a simpler general starting range of medium-soft to medium-firm for side sleepers; its weight-sensitive recommendations above refine that starting point. See its guide to side sleeping for more on position and alignment.
If you mostly sleep on your back
Consider a surface that contours without letting your midsection sag. A convenient general starting range is medium-firm to firm, with the weight-sensitive chart helping you narrow it. Sleep Foundation quotes Sarah Silverman, Psy.D., a licensed psychologist and holistic sleep wellness consultant, as saying that back sleepers may benefit from a firmer mattress because extra support can feel more comfortable in that position.
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If you mostly sleep on your stomach
A firmer feel can help limit sinking through the middle, while some contouring may still be comfortable. The general starting point is firm; the weight-sensitive chart offers a broader range for lighter sleepers and firmer recommendations for heavier sleepers. Sleep Foundation likewise notes that stomach sleepers may benefit from a firmer mattress.
If you change positions during the night
Use the position you spend the most time in—or the one you wake in—as your first guide. Then consider whether the mattress lets you reposition comfortably. Memory foam’s close contouring may cushion pressure points, but some sleepers find it harder to move on a closely conforming surface. That is a personal preference, not a universal flaw.
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Account for how memory foam feels under your body
Memory foam conforms closely to the body, which may suit sleepers seeking cushioning around pressure points such as the shoulders and hips. How much it contours depends on the comfort layers as well as the support core beneath them. Your weight changes how deeply you sink, so a mattress described as medium may feel softer to one person and firmer to another.
Decide whether your priority is more pressure relief or more resistance to sinking. If you share a bed, account for both sleepers’ positions and feel preferences rather than assuming one label will suit you both. Sleep Foundation’s mattress shopping guide discusses features to weigh when comparing options.
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Compare the actual mattress, not just its firmness label
- Identify your main position. Note the position you use most often, including the one in which you wake.
- Use your weight as a modifier. Find the corresponding range in the table, while treating it as a recommendation rather than a guarantee.
- Choose your feel priority. Decide whether you want more cushioning at pressure points or more resistance to sinking.
- Read the construction and feel description. Compare the comfort layers, expected contouring and sinkage, support description, and ease of changing positions. Do not assume “medium” means the same thing from one brand to another.
- Check the return or trial terms. Comfort is subjective, and a chart cannot establish whether a particular mattress suits you. Review the seller’s current policy before buying; terms vary by company. Sleep Foundation’s online mattress buying guide covers factors to consider when shopping remotely.
This guidance can help narrow a shopping choice, but it is not a diagnosis or a guarantee that any firmness will relieve pain.
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