Health Calculators

Health and wellness calculators for BMI, calories, fitness tracking, and body composition. Evidence-based formulas for your well-being journey.

28 calculators available

28 calculators found

Body Metrics

15

Army Body Fat Calculator

Estimate body fat percentage using the U.S. Department of Defense tape-measure method.

BAC Calculator

Estimate blood alcohol concentration using the Widmark formula.

BMI Calculator

Calculate Body Mass Index from height and weight to assess weight status categories.

Body Fat Calculator

Calculate body fat percentage, lean body mass, and fat mass using the U.S. Navy circumference method.

Body Surface Area Calculator

Calculate body surface area using the Du Bois, Mosteller, or Haycock formula.

Body Type Calculator

Determine your body frame size from wrist circumference and height.

Conception Calculator

Estimate pregnancy timeline based on weeks pregnant.

GFR Calculator

Estimate glomerular filtration rate using the CKD-EPI 2021 race-free equation to assess kidney function and CKD staging.

Ideal Weight Calculator

Estimate your ideal body weight using four established anthropometric formulas: Devine, Robinson, Miller, and Hamwi.

Lean Body Mass Calculator

Calculate lean body mass, fat mass, and body fat percentage using the Boer equation for body composition analysis.

Ovulation Calculator

Estimate your ovulation day, fertile window, and next period based on menstrual cycle length and luteal phase physiology.

Period Calculator

Estimate menstrual cycle phases including next period day, ovulation timing, follicular phase, and luteal phase length from cycle and period duration.

Pregnancy Weight Gain Calculator

Estimate recommended gestational weight gain based on pre-pregnancy BMI using IOM 2009 guidelines.

Sleep Calculator

Calculate optimal bedtimes based on wake-up time and sleep cycles.

WHR Calculator

Calculate waist-to-hip ratio and assess cardiovascular health risk category based on WHO guidelines.

Nutrition & Diet

7

Calorie Calculator

Calculate daily calorie needs using the Mifflin-St Jeor equation for BMR, TDEE, and weight management goals.

Carbohydrate Calculator

Calculate daily carbohydrate intake in grams and calories based on your total caloric needs and desired macronutrient ratio.

Fat Intake Calculator

Calculate daily dietary fat needs in grams and calories, including saturated and trans fat limits based on health guidelines.

Macro Calculator

Calculate daily macronutrient targets in grams for protein, carbohydrates, and fat from your calorie goal and desired macro split.

Protein Calculator

Calculate daily protein requirements adjusted for body weight, physical activity level, and fitness goal using evidence-based intake multipliers.

TDEE Calculator

Calculate Total Daily Energy Expenditure using the Harris-Benedict Revised equation with physical activity level multipliers.

BMR Calculator

Calculate Basal Metabolic Rate using the Katch-McArdle formula based on estimated lean body mass.

Fitness & Exercise

6

Pace Calculator

Calculate running or walking pace, finish time, and speed from distance and time.

Target Heart Rate Calculator

Calculate target heart rate zones for exercise using the Karvonen method.

Calories Burned Calculator

Estimate calories burned during exercise using metabolic equivalent (MET) values for various activities.

One Rep Max Calculator

Estimate your one-repetition maximum using the Epley and Brzycki equations, plus training zone percentages for progressive overload programming.

Steps to Calories Calculator

Estimate calories burned from step count using body weight and stride length for walking exercise.

Steps to Miles Calculator

Convert step count to distance in miles and kilometers using your stride length for accurate walking and running tracking.

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Using Health Calculators Responsibly

Health calculators provide useful estimates based on well-established formulas, but they are not a substitute for professional medical advice. Always consult with a healthcare provider before making significant changes to your diet or exercise routine. Our calculators use peer-reviewed formulas and clearly document their methodology so you understand the science behind each result.

Understanding the Limitations of Health Calculators

Health metrics like BMI and body fat percentage are population-level screening tools and may not reflect individual circumstances such as muscle mass, bone density, or ethnicity-specific variations. Use these results as a starting point for conversation with your doctor, not as a definitive diagnosis. Each calculator documents which formula it uses so you can compare results across different methodologies.