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⚠️ Time to look closely
Your mattress may be past its prime
Is your mattress the problem?
Sleep foundations put a good mattress's life at roughly 6-10 years. Slide to your mattress's age — honest answer.
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Sagging you can see, waking stiff, sleeping better in a hotel than at home, or 8+ years old — any one is a signal. You spend a third of your life here; it's the last place to cut corners.
What keeps you up?
🚧 In development. These are mattress types to search, not vetted specific models yet. Before buying, check the exact firmness and size, and — importantly — the seller's trial and return terms: an Amazon listing may not include the mattress brand's advertised sleep trial.
Pick what fits you to see the mattress type that suits it, in three budgets — a starting point for your own research.
The free guide
The 2-minute mattress-fit checklist
Firmness by sleep position, the cooling question for hot sleepers, motion transfer for couples, and the trial-period traps to avoid — one page, so you buy once and buy right.
"~26 years in bed / a third of your life" → based on the widely-used 8 hours/night sleep guideline across an average lifespan.
"Replace a mattress roughly every 6-10 years" → general guidance from sleep-health foundations and mattress-industry standards; the right number depends on the mattress and the sleeper.
"Sleep quality affects health" → sleep is broadly linked in the research to cardiovascular, metabolic, immune and cognitive health. This page does not claim a specific mattress adds years to your life — it prices the cost of a good night and helps you match a mattress to how you sleep.
Honest note: the cost-per-night figure is simple arithmetic (price ÷ nights). The sleep-and-health links are real but general — this is buying guidance and math, not medical advice.
Part of Honest Math
Four calculators, one rule: show the math
The Sleep Math is one of four independent tools. Same method, same honesty rules — no fear-selling, sources for every claim, and "you don't need to buy anything" is always an allowed answer.
What we are: a small independent project, published under a brand name rather than a person. We're anonymous by choice — but not unaccountable, which is what this page is for.
Desk-researched, not hands-on tested. This matters, so we'll say it plainly: we have not physically tested the products we point to. Our picks come from manufacturer specifications, independent certifications (NSF/ANSI, AHAM, IAPMO), published lab-style reviews and customer feedback at scale. Where we say a product is certified for something, we link you to the listing so you can verify it yourself. If you want hands-on testing, read a site that does that — and then come back for the math.
How the numbers work: every calculator shows its assumptions and lets you change the ones that matter. Where published estimates disagree (they often do), we show the range rather than the flattering end, and we say which input is the least certain.
How we're funded: some links are affiliate links — if you buy, we may earn a small commission at no extra cost to you. Options shown without a link earn us nothing; we include them when they're genuinely the right answer. We never rank by commission, and the highest-paying option is regularly not our first pick.
What we won't do: claim a product removes something it isn't certified for, invent urgency, use a fake live counter, gate useful information behind an email, or tell you to buy when the honest answer is "test first" or "you don't need this".
Mistakes: we get things wrong. When we do, we change the page rather than quietly delete it — recent corrections include replacing a single water figure with an honest range, removing a life-expectancy estimate that misapplied population research, and dropping a product we couldn't stand behind. If you spot an error, we'd rather know.
Not professional advice. These are planning estimates and general information, not medical, plumbing or safety advice.
Product details last checked: 2 August 2026. Prices and availability change — always confirm on the retailer's page before buying.