Free Fitness & Health Calculators
Calculate your TDEE, BMR, macros, body fat, BMI, and more. Accurate formulas, instant results, no sign-up required.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) to understand how many calories you burn each day based on your age, weight, height, and activity level.
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) to find out how many calories your body burns at rest using the Mifflin-St Jeor equation.
Macro Calculator
Calculate your optimal daily intake of protein, carbs, and fat based on your goals - whether you want to lose weight, build muscle, or maintain.
Calorie Deficit Calculator
Calculate the right calorie deficit for safe and sustainable weight loss. Find out exactly how many calories to eat to reach your goal weight.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method. Just enter your measurements to get an accurate estimate of your body composition.
Protein Calculator
Calculate your optimal daily protein intake based on your weight, activity level, and fitness goals.
Ideal Weight Calculator
Calculate your ideal body weight based on your height, age, and gender using multiple scientific formulas.
1RM Calculator
Calculate your one-rep max (1RM) for any lift based on the weight and reps you can perform. Uses the Epley and Brzycki formulas.
Water Calculator
Calculate your recommended daily water intake based on your weight, activity level, and climate.
BMI Calculator
Calculate your Body Mass Index (BMI) to see if you are underweight, normal weight, overweight, or obese based on your height and weight.
Lean Body Mass
Calculate your lean body mass (LBM) — the weight of everything in your body except fat, including muscle, bones, organs, and water.
Heart Rate Zones
Calculate your heart rate training zones based on your age and resting heart rate. Optimize your cardio for fat burning, endurance, or performance.
Body Recomp
Calculate your calories and macros for body recomposition — losing fat and building muscle at the same time.
Creatine Calculator
Calculate your optimal creatine monohydrate dosage based on your body weight, including loading and maintenance phases.
Sleep Calculator
Calculate the best time to go to sleep or wake up based on 90-minute sleep cycles. Wake up refreshed instead of groggy.
Bench Press Max
Calculate your bench press one-rep max and get a complete percentage-based training chart for your bench press programming.
Squat Max
Calculate your squat one-rep max and get training percentages for your squat programming.
Deadlift Max
Calculate your deadlift one-rep max and get training percentages for your deadlift programming.
Running Pace
Calculate your running pace, finish time, or distance. Perfect for planning your 5K, 10K, half marathon, or marathon training.
VO2 Max
Estimate your VO2 max based on your running performance or the Cooper test. Understand your cardiovascular fitness level.
IF Calculator
Calculate your intermittent fasting schedule and eating window. Get calorie and macro targets for your fasting protocol.
Keto Calculator
Calculate your ideal macronutrient ratios for the ketogenic diet. Get personalized fat, protein, and carb targets to stay in ketosis.
Pregnancy Weight
Calculate the recommended weight gain during pregnancy based on your pre-pregnancy BMI and current week of pregnancy.
Army Body Fat
Calculate your body fat percentage using the U.S. Army ABCP standards. Check if you meet the Army body composition requirements.
Lean Bulk
Calculate your calories and macros for a lean bulk — maximize muscle gain while minimizing fat gain with a controlled surplus.
Why Use CalcMyFit?
Accurate Formulas
All calculators use scientifically validated formulas like Mifflin-St Jeor, Katch-McArdle, and the U.S. Navy method.
Completely Free
No sign-up, no paywall, no hidden fees. Every calculator is free to use, forever.
Personalized Results
Get results tailored to your body stats and fitness goals, with actionable recommendations.
Understanding Your Fitness Numbers
Knowing your body's key metrics is the foundation of any successful fitness journey. Your TDEE (Total Daily Energy Expenditure) tells you how many calories you burn each day, while your BMR (Basal Metabolic Rate) shows the calories your body needs at complete rest.
Understanding your macronutrient needs— the right balance of protein, carbohydrates, and fats — helps you fuel your body optimally whether you're trying to lose fat, build muscle, or maintain your current physique.
Tracking your body fat percentage and BMI gives you a clearer picture of your body composition than weight alone. Combined with tools like the one rep max calculator and protein intake calculator, you have everything you need to make informed decisions about your training and nutrition.