Health

Estimate BAC from drinks consumed. Widmark formula, multiple drink types, time to sober up, legal limits by country. Free online BAC calculator

Calculate Body Mass Index (BMI) with height and weight. Get health category (underweight, normal, overweight, obese). Free online BMI calculator

Estimate body fat percentage using US Navy method or BMI. Calculate fat mass and lean mass. Free body composition calculator

Calculate daily calorie needs (TDEE) based on age, weight, height, and activity level. Get macro recommendations. Free TDEE calculator

Calculate due date from LMP or conception. Week-by-week fetal development, baby size, milestones. Free pregnancy calculator with timeline

Calculate optimal bedtime and wake times based on 90-minute sleep cycles. Sleep debt calculator, chronotype quiz, sleep recommendations by age

Calculate how much water you should drink daily based on weight, activity, and climate. Free hydration calculator