General Health Calculators

Everyday Health, Quantified

Not every useful health number fits neatly into a single category. Sleep timing sits between circadian biology and daily planning. Blood pressure readings show up at the pharmacy and at home. Cardiometabolic risk scores pull from a mix of lab values and lifestyle data. Blood alcohol content is closer to toxicology than training. This category collects the practical, evidence-informed tools that don’t belong to any one specialty but show up in ordinary decisions — when to set an alarm, whether a reading needs follow-up, how long to wait before driving.

Blood pressure classifications follow the 2017 ACC/AHA guideline thresholds (normal under 120/80 mmHg, elevated at 120–129/under 80, stage 1 hypertension at 130–139/80–89, stage 2 at 140/90 and above). A single reading is rarely the whole story; the guideline emphasizes multiple measurements across visits under consistent conditions before making clinical decisions. Cardiovascular risk scores like Framingham combine age, sex, cholesterol, blood pressure, smoking, and diabetes status into a 10-year probability estimate and are widely used in primary care as a conversation starter about prevention. For sleep, the 90-minute cycle model — popularized from Dement and Kleitman’s polysomnography work — gives a useful bedtime or wake-time target, though individual cycles actually range from about 70 to 120 minutes. Blood alcohol content is most commonly estimated with the 1932 Widmark equation, which assumes an average body-water distribution and a fixed metabolism rate of roughly 0.015% BAC per hour.

These tools are calibrated on population averages and can miss the mark for individuals. Medications, hormonal cycles, thyroid status, body composition, genetics (notably ALDH2 variants that change alcohol metabolism), and underlying cardiovascular or metabolic conditions can all shift your real numbers away from the estimated ones. Treat the results as an informational nudge toward a conversation with a clinician, not a verdict. The BAC calculator in particular is for educational use — it does not tell you whether you are safe to drive, because legal thresholds vary by jurisdiction and impairment starts below legal limits. These calculators are for informational purposes only and are not a substitute for professional medical advice.

How These Calculators Relate

For daily sleep planning, start with the Sleep Calculator to line up bedtimes and wake times with 90-minute cycles. When you take a home blood pressure reading, use the Blood Pressure Calculator to classify it against the 2017 ACC/AHA stages, and reach for the Heart Disease Risk Calculator or Diabetes Risk Calculator when you have lab values in hand for a longer-range risk estimate. The Cholesterol Ratio Calculator complements a standard lipid panel, and the BAC Calculator is an educational tool for thinking about alcohol — not a substitute for a breathalyzer or for calling a ride home.