LongevityMate Tools

Free health calculators that explain the answer

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5 reviewed tools in Preventive health

Count completed alcohol-free calendar days between two dates, plus the inclusive streak day and exact weeks-and-days breakdown.

Convert one recorded temperature between degrees Celsius and degrees Fahrenheit using the exact scale relationship, without interpreting the reading.

Turn an average daily screen-time duration into neutral 7-day, 30-day and 365-day totals, without scores, targets or judgement.

Calculate cigarette spending over 1, 7, 30 and 365 days from your own pack price and pack size. Private, currency-neutral arithmetic.

Calculate cigarette pack-years from average cigarettes per day and years smoked. See the formula, limits and what the result cannot tell you.

Each calculator must publish its formula, assumptions, eligible population, exclusions, sources, version and review date.

Calculator inputs and results are not placed in URLs or analytics. A tool can be disabled or rolled back without replacing its stable URL.