Health & Fitness
BMI, calories, macros, and fitness calculators for a healthier lifestyle.
16 calculators available
Medical
Body Metrics
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.
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.
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.
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.
About Health & Fitness
BMI, calories, macros, and fitness calculators for a healthier lifestyle. CALTRX provides 16 free health & fitness 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.