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How to Choose Mattress Firmness

Choose mattress firmness using your sleep position, body weight, pressure sensitivity and preference for sink versus surface support.

Updated August 30, 2026 · Mattress Metric Editorial
Affiliate disclosure: Mattress Metric may earn a commission if you purchase through qualifying links. Our editorial conclusions are based on published specifications and independent evidence, not a merchant payout.

Start with your body and sleeping position, not with a brand’s most popular firmness. The goal is enough cushioning to avoid pressure without allowing your spine and midsection to sag.

Side sleepers

Look for enough give around the shoulder and hip. Lighter side sleepers may prefer softer surfaces than heavier side sleepers.

Back sleepers

Aim for a balance of lumbar cushioning and support beneath the hips. Medium-firm is a common starting point, not a rule.

Stomach sleepers

Usually need stronger resistance under the midsection to limit excessive pelvic sink.

Combination sleepers

Often benefit from a middle-ground firmness and enough responsiveness to change positions without feeling stuck.

Bottom line

Use this guide as a decision framework, then verify current specifications, pricing and return terms before buying. Mattress fit is personal, and no single model is best for every sleeper.

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