Fitness Calculators
Free tools to help you track your fitness goals — from BMI and body fat to calorie needs and one-rep max.
BMI Calculator
Calculate your Body Mass Index (BMI) based on your height and weight. BMI is a screening tool used to identify whether you are at a healthy weight for your height.
Calorie Calculator
Estimate your Total Daily Energy Expenditure (TDEE) based on your age, gender, height, weight, and activity level. Use this to find out how many calories you need to maintain, lose, or gain weight.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy circumference method. Provides a breakdown by body fat category (essential fat, athletes, fitness, average, obese).
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) — the number of calories your body needs at complete rest. Calculated using the Mifflin-St Jeor equation.
Ideal Weight Calculator
Find your ideal body weight range based on your height and gender using multiple well-known formulas (Devine, Hamwi, Robinson, and Miller).
Pace Calculator
Calculate your running or walking pace, finish time, or distance. Enter any two values to get the third. Supports miles and kilometers.
Army Body Fat Calculator
Calculate body fat percentage using the U.S. Army body fat assessment method and check if you meet the U.S. Army body fat standards based on age and gender.
Lean Body Mass Calculator
Estimate your Lean Body Mass (LBM) — the weight of everything in your body except fat. Useful for tracking muscle mass and setting fitness goals.
Healthy Weight Calculator
Find your healthy weight range for your height based on the BMI healthy range of 18.5 to 24.9. See how far you are from your target range.
Calories Burned Calculator
Estimate the number of calories burned during various physical activities based on your weight and duration. Uses MET (Metabolic Equivalent of Task) values.
One Rep Max Calculator
Estimate your one-repetition maximum (1RM) for any lift based on the weight and reps you can perform. Uses multiple formulas (Epley, Brzycki, Lander) and shows your training percentages.
Target Heart Rate Calculator
Calculate your target heart rate zones for different training intensities using the Karvonen method. Enter your age and resting heart rate to get personalized zones.
Plate Calculator
Calculate exactly which weight plates to load on each side of the barbell to reach your target weight.
FFMI Calculator
Calculate your Fat-Free Mass Index (FFMI) — a measure of muscularity adjusted for height. Useful for assessing natural muscle-building potential.