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Health
BMI, calories and body metrics, always with official formulas.
- Doctors in the United StatesHow many doctors practice in each US state and in which specialties, from the federal NPPES registry
- Global health atlasPublic health indicators by country, with WHO data
- Skincare and sun protectionUV Index, shade, sunscreen and basic skin care with WHO and CDC sources
- Mental health and well-beingSelf-care, sleep, stress, anxiety and burnout in educational pages with WHO and NIMH sources
- BMI calculatorCalculate your BMI (weight ÷ height²) with the official WHO classification and the limitations everyone should know.
- Daily calorie calculatorCalculate your BMR and daily calories to maintain, lose or gain weight, using the Mifflin-St Jeor equation.
- Ideal weight calculatorCalculate your ideal weight as the range across the four classic formulas plus the healthy BMI range. Ideal weight is a reference, not a medical target, and the formulas diverge.
- Body fat percentage calculatorEstimate your body fat percentage with the US Navy method, using only a tape measure. See the formula, the reference categories and the margin of error versus DEXA.
- Daily water intake calculatorCalculate how much water to drink a day using the 35 ml per kilo rule, adjusted for exercise. It is a rule of thumb: real need varies with climate and health.
- Due date calculatorCalculate the due date with Naegele's rule (LMP plus 280 days) and see your weeks of pregnancy. It is an estimate: only about 5% of babies are born on the date.
- Ovulation calculatorEstimate your fertile days and ovulation day from your LMP and cycle length. It is an estimate, not a contraceptive method: cycles vary and ovulation can shift.
- Macro calculatorCalculate your macros in grams from target calories and goal (maintenance, cutting or bulking). These are starting points, not a nutrition prescription.