What Does Mattress Firmness "7" Actually Mean?
It means whatever that specific brand says it means. There is no accredited body that standardizes mattress firmness numbers across brands — a "7" is the brand's own self-reported position within its own product lineup, not a measurement calibrated against any competitor. A Saatva "7" and a different brand's "7" are not guaranteed to feel the same in a showroom.
The one thing to know: A brand's '1-10' firmness number or 'Soft/Medium/Firm' label is entirely self-assigned — there is no industry body auditing it, no standard scale it's measured against, and no requirement that a '6' from one brand feel anything like a '6' from another. Two 'medium-firm' mattresses from different brands can differ enormously in actual feel. Treat every brand's number as a claim within that brand's own lineup, not a cross-brand measurement.
What a firmness number can tell you
Within a single brand's own lineup, the number is useful and consistent — that brand's "4" will reliably feel softer than its own "8". The number breaks down as a cross-brand comparison tool, which is exactly how most "best mattress" content treats it.
What actually stands behind the number
The closest objective measure is ILD (Indentation Load Deflection) — a defined foam-industry test measuring the force needed to compress a standard foam sample 25%. A minority of brands publish it per layer; most publish only the subjective label. See our Firmness Translation Index for which brands actually disclose ILD, and What Is ILD? for the full definition.
Frequently Asked Questions
It means whatever the specific brand that assigned it says it means — there is no industry standard 1-10 firmness scale. A '7' is the brand's own self-reported position on its own lineup (usually Soft through Firm), not a measurement calibrated against any other brand. Two different brands' '7' mattresses can feel meaningfully different in a showroom.
Sometimes, but it's rarely published. The closest objective measure is ILD (Indentation Load Deflection), the force needed to compress a standard foam sample 25%. A handful of brands publish ILD for their foam layers; most publish only the subjective 1-10 label or Soft/Medium/Firm word instead.
A subjective label is easier to market and impossible to be contradicted on, while ILD is a specific, checkable number. We don't attribute motive, but the practical effect is that shoppers compare marketing labels across brands as if they were an objective spec, when they aren't.
Treat it as directional information about that brand's own product range only — useful for choosing between two mattresses from the SAME brand, much less reliable for comparing across brands. Where available, cross-reference published ILD, construction type, and comfort-layer thickness instead.