LongevityMate Tools

Free health calculators that explain the answer

Get a clear result in under a minute, then understand what it means, what can affect it and what to do next. Free. No sign-up.

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79 reviewed tools

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.

Multiply EPA and DHA amounts from a label by the servings entered, then see separate and combined totals without dose or target advice.

Estimate how many days a supplement container will last from the amount in it and the amount used per day. Inputs and results stay in your browser.

Count exact calendar days until or past a full date printed on a supplement label, without judging safety, potency or suitability.

Convert vitamin D2 or D3 label amounts between international units (IU) and micrograms (mcg) using the exact 1 mcg = 40 IU relationship.

See how each calculator works, which measurements it uses, who it is suitable for and the sources behind the answer.

Your calculator inputs and results stay on your device. They are not added to page links or analytics.