Health Calculators
Track BMI, calories, body metrics, and fitness goals.
38 calculators available
Body & Fitness
BMI Calculator
Calculate your Body Mass Index and see your health classification.
Calorie Calculator
Find your daily caloric needs for weight loss, maintenance, or gain.
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method.
BMR Calculator
Calculate your Basal Metabolic Rate.
TDEE Calculator
Calculate your Total Daily Energy Expenditure.
Ideal Weight Calculator
Find your ideal weight based on height using multiple formulas.
Macro Calculator
Calculate your ideal macronutrient split for protein, carbs, and fat.
Pace Calculator
Calculate running or walking pace, time, or distance.
Army Body Fat Calculator
Calculate body fat percentage using the U.S. Army tape test method.
Lean Body Mass Calculator
Calculate lean body mass from weight and body fat percentage.
Healthy Weight Calculator
Calculate the healthy weight range for your height using BMI guidelines.
Calories Burned Calculator
Estimate calories burned during various exercises.
One Rep Max Calculator
Estimate your one-rep max for any lift.
Target Heart Rate Calculator
Calculate target heart rate zones for exercise based on age and fitness goals.
Heart Rate Zone Calculator
Find your target heart rate zones for optimal training.
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.
Pregnancy
Pregnancy Calculator
Estimate due date, current trimester, and pregnancy milestones from last menstrual period.
Due Date Calculator
Estimate pregnancy due date based on 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.
Conception Calculator
Estimate your conception date from your due date.
Nutrition
Protein Calculator
Calculate daily protein needs based on weight, activity level, and goals.
Water Intake Calculator
Calculate how much water you should drink daily.
Carbohydrate Calculator
Calculate daily carbohydrate needs based on calorie intake and activity level.
Fat Intake Calculator
Calculate recommended daily fat intake based on calorie needs.
Protein Intake Calculator
Find your optimal daily protein intake based on your goals.
Meal Calorie Counter
Calculate calories and macros for a meal from common food portions.
Medical
Blood Pressure Assessment
Assess blood pressure category and health risk based on AHA guidelines.
BAC Calculator
Estimate blood alcohol content based on drinks and body weight.
GFR Calculator
Estimate Glomerular Filtration Rate to assess kidney function.
Body Surface Area Calculator
Calculate body surface area for medical purposes.
General Health
Sleep Calculator
Calculate optimal bedtime or wake time based on sleep cycles.
Body Type Calculator
Determine body frame size and somatotype from measurements.
Bra Size Calculator
Calculate bra size from band and bust measurements in inches.
Height Converter
Convert height between feet/inches and centimeters.
Weight Watcher Points Calculator
Calculate Weight Watchers points for foods based on nutritional values.
Period Calculator
Track and predict menstrual cycle dates based on cycle length and history.
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.