Health Calculators
Track BMI, calories, body metrics, and fitness goals.
38 calculators available
Body Composition
BMI Calculator
Calculate your Body Mass Index and see your health classification.
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method.
Body Surface Area Calculator
Calculate body surface area for medical purposes.
Ideal Weight Calculator
Find your ideal weight based on height using multiple formulas.
Bra Size Calculator
Calculate bra size from band and bust measurements in inches.
Height Converter
Convert height between feet/inches and centimeters.
Army Body Fat Calculator
Calculate body fat percentage using the U.S. Army tape test method.
Fitness
Calories Burned Calculator
Estimate calories burned during various exercises.
Heart Rate Zone Calculator
Find your target heart rate zones for optimal training.
One Rep Max Calculator
Estimate your one-rep max for any lift.
Pace Calculator
Calculate running or walking pace, time, or distance.
Steps to Distance Converter
Convert step count to distance walked in miles and kilometers.
VO2 Max Estimator
Estimate VO2 max from resting heart rate and age using the Uth formula.
General Health
Body Type Calculator
Determine body frame size and somatotype from measurements.
Carbohydrate Calculator
Calculate daily carbohydrate needs based on calorie intake and activity level.
Conception Calculator
Estimate your conception date from your due date.
Fat Intake Calculator
Calculate recommended daily fat intake based on calorie needs.
GFR Calculator
Estimate Glomerular Filtration Rate to assess kidney function.
Healthy Weight Calculator
Calculate the healthy weight range for your height using BMI guidelines.
Lean Body Mass Calculator
Calculate lean body mass from weight and body fat percentage.
Period Calculator
Track and predict menstrual cycle dates based on cycle length and history.
Protein Calculator
Calculate daily protein needs based on weight, activity level, and goals.
Target Heart Rate Calculator
Calculate target heart rate zones for exercise based on age and fitness goals.
Weight Watcher Points Calculator
Calculate Weight Watchers points for foods based on nutritional values.
Medical
BAC Calculator
Estimate blood alcohol content based on drinks and body weight.
Blood Pressure Assessment
Assess blood pressure category and health risk based on AHA guidelines.
BMR Calculator
Calculate your Basal Metabolic Rate.
Due Date Calculator
Estimate pregnancy due date based on last menstrual period.
Nutrition
Calorie Calculator
Find your daily caloric needs for weight loss, maintenance, or gain.
Macro Calculator
Calculate your ideal macronutrient split for protein, carbs, and fat.
Meal Calorie Counter
Calculate calories and macros for a meal from common food portions.
Protein Intake Calculator
Find your optimal daily protein intake based on your goals.
TDEE Calculator
Calculate your Total Daily Energy Expenditure.
Water Intake Calculator
Calculate how much water you should drink daily.
Pregnancy
Pregnancy Calculator
Estimate due date, current trimester, and pregnancy milestones from last menstrual period.
Pregnancy Weight Gain Calculator
Calculate recommended weight gain during pregnancy based on pre-pregnancy BMI.
Ovulation Calculator
Estimate ovulation day and fertile window from cycle data.
Wellness
About Health Calculators
Track BMI, calories, body metrics, and fitness goals. CALTRX provides 38 free health calculators with step-by-step explanations, formulas, real-world examples, and expert tips. Every calculator is designed for clarity and accuracy, helping you understand not just the answer but the reasoning behind it.