Quick calculators for everyday health questions.
Estimate body metrics, nutrition targets, and hydration needs with clear educational tools. These calculators are informational and do not replace medical care.
Body metrics
BMI Calculator
Estimate body mass index from height and weight, with a plain-language category.
Nutrition
BMR Calculator
Estimate resting daily energy needs using the Mifflin-St Jeor equation, with clear context for interpreting your result.
Nutrition
Daily Calorie Needs Calculator
Estimate maintenance calories and gentle weight-change ranges by activity level.
Hydration
Water Intake Calculator
Estimate daily fluid needs based on body weight, activity, and warm-weather exposure.
Nutrition
Protein Intake Calculator
Estimate a daily protein range based on body weight, activity, and goal, with practical context for using the result safely.
Nutrition
Macro Calculator
Turn a daily calorie estimate into carbohydrate, protein, and fat targets using an adjustable planning pattern.
Nutrition
Carbohydrate Intake Calculator
Estimate a broad daily carbohydrate range from your calorie target, with context for individual needs.
Body metrics
Body Fat Percentage Calculator
Estimate adult body fat percentage from circumference measurements using the U.S. Navy method.
Body metrics
Waist-to-Height Ratio Calculator
Compare waist circumference with height as a simple adult health-screening estimate.
Fitness
Heart Rate Zone Calculator
Estimate age-based exercise heart-rate zones for walking, running, and cardio workouts, with practical context for safer training plans.
Sleep
Sleep Calculator
Work backward from a wake-up time to estimate when to get into bed for an adult sleep target.
Fitness
Walking Calories Calculator
Estimate calories used during a walk from body weight, duration, and walking pace.
Fitness
Steps to Calories Calculator
Estimate walking distance and calories from your step count, body weight, and height, with practical context for stride length and daily activity.
Pregnancy
Pregnancy Due Date Calculator
Estimate a pregnancy due date from the first day of the last menstrual period and usual cycle length.
Pregnancy
Ovulation Calculator
Estimate an ovulation date and fertile window from the first day of the last period and usual cycle length.
Body metrics
Ideal Weight Range Calculator
Estimate an adult BMI reference weight range from height, with context about the limits of one-size-fits-all targets.
Lifestyle
Caffeine Intake Calculator
Estimate total daily caffeine from serving count and label amount, then compare it with general adult guidance.
Lifestyle
Smoking Cost Calculator
Estimate the monthly and yearly cost of cigarettes from daily use, pack size, and local pack price.
Lifestyle
Alcohol Standard Drink Calculator
Estimate alcohol grams and U.S. standard drinks from beverage volume and alcohol by volume (ABV).
Prevention
Diabetes Risk Score Tool
Use an ADA-style adult screening checklist to estimate whether diabetes risk and blood testing may be worth discussing.