Health Calculators
Our health calculators help you understand your body and make informed health decisions. Calculate BMI, daily calorie needs, medication dosages, pregnancy dates, and more.
31 calculators available
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BMI Calculator
Calculate your Body Mass Index (BMI) and find out your weight category.
Calorie Calculator
Calculate your daily calorie needs based on your goals.
BMR Calculator
Calculate your Basal Metabolic Rate — calories burned at rest.
Body Fat Calculator
Estimate your body fat percentage using body measurements.
Pregnancy Due Date Calculator
Calculate your estimated due date from last menstrual period.
Daily Water Intake Calculator
Calculate how much water you should drink each day.
Ideal Weight Calculator
Calculate your ideal body weight based on the Devine formula using your height and gender.
Ovulation Calculator
Estimate your next ovulation day and fertile window based on your cycle length and last period.
Macro Calculator
Calculate your daily protein, fat, and carbohydrate targets based on your calorie goal and body weight.
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One Rep Max Calculator
Estimate your one-repetition maximum (1RM) for any lift using the Brzycki formula.
Target Heart Rate Calculator
Calculate your target heart rate for exercise using the Karvonen method with your resting heart rate and age.
Sleep Calculator
Find your ideal bedtime by working backward from your wake-up time based on complete 90-minute sleep cycles.
Lean Body Mass Calculator
Estimate your lean body mass (muscle, bone, and organs) using the Boer formula with your weight, height, and gender.
TDEE Calculator
Calculate your Total Daily Energy Expenditure using the Mifflin-St Jeor equation adjusted for your activity level.
Calories Burned Calculator
Estimate calories burned during any exercise using the MET (Metabolic Equivalent of Task) method.
Protein Intake Calculator
Calculate your optimal daily protein intake based on body weight and activity level.
Blood Alcohol Content Calculator
Estimate your blood alcohol content using the Widmark formula based on drinks, weight, gender, and time.
Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio to assess abdominal obesity and associated cardiovascular risk.
Due Date Calculator
Estimate your pregnancy due date and current gestational age using Naegele's Rule from your last menstrual period.
Menstrual Cycle Calculator
Track your menstrual cycle to predict your next period and ovulation day based on cycle length.
VO2 Max Calculator
Estimate your VO2 max (maximal oxygen uptake) from a 12-minute run using the Cooper test formula.
Dog Age Calculator
Convert your dog's age in dog years to the equivalent human age using the AKC formula.
Cat Age Calculator
Convert your cat's age to the equivalent human age using the AAHA feline life-stage formula.
Water Intake Calculator
Calculate your recommended daily water intake based on body weight and exercise duration.
BMI Prime Calculator
Calculate your BMI Prime — a normalized index showing how your BMI compares to the upper healthy limit of 25.
Body Fat Percentage Calculator (Navy Method)
Estimate your body fat percentage using the US Navy circumference method — no calipers or scales needed.
Child Height Predictor
Predict a child's adult height using the mid-parental height method based on parent heights.
Medication Dosage Calculator
Calculate a weight-based medication dose in milligrams from body weight and prescribed dose per kilogram.
Creatinine Clearance Calculator
Estimate kidney function (creatinine clearance) using the Cockcroft-Gault equation for medication dosing.
Sleep Debt Calculator
Calculate your accumulated sleep debt over a period of days based on recommended versus actual sleep hours.
Conception Date Calculator
Estimate when conception likely occurred by working backward 266 days from an estimated due date.
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