Health & Fitness Calculators
Track your body and reach your goals with calculators for BMI, calories, macros, heart rate, and more. Whether you are losing weight, building muscle, or planning a pregnancy, get clear numbers backed by trusted formulas.
BAC Calculator
Estimate your blood alcohol concentration from drinks, body weight, sex, and time elapsed.
BMI Calculator
Calculate your Body Mass Index and check healthy weight range.
BMR Calculator
Calculate Basal Metabolic Rate and Total Daily Energy Expenditure.
Body Fat Calculator
Calculate body fat percentage using the US Navy method based on measurements.
Body Surface Area Calculator
Calculate body surface area (BSA) using the Mosteller and Du Bois formulas for medical dosing.
Calorie Burn Estimator
Estimate calories burned during any activity based on weight and duration.
Calorie Calculator
Calculate your daily calorie needs to lose, maintain, or gain weight based on your goals and activity.
Carbohydrate Calculator
Calculate your recommended daily carbohydrate intake based on calories and fitness goals.
Ideal Weight Calculator
Calculate ideal body weight range using multiple established medical formulas.
Lean Body Mass Calculator
Calculate your lean body mass and fat mass from height, weight, and body fat percentage.
Macro Calculator
Calculate your optimal daily protein, carbohydrate, and fat macros for any fitness goal.
One Rep Max Calculator
Estimate your one rep max (1RM) for any lift from the weight and reps you can perform.
Ovulation Calculator
Find your most fertile days and predicted ovulation date based on your menstrual cycle.
Period Tracker
Predict your next period, ovulation, and fertile window.
Pregnancy Calculator
Calculate your due date, current week, and trimester from last menstrual period.
Pregnancy Weight Gain Calculator
Track healthy pregnancy weight gain by week based on pre-pregnancy BMI.
Protein Calculator
Calculate your ideal daily protein intake based on body weight, activity level, and fitness goals.
Running Pace Calculator
Calculate running pace, speed, and finish time for any distance.
Sleep Cycle Calculator
Find the best wake-up times based on 90-minute sleep cycles.
Target Heart Rate Calculator
Calculate your target heart rate zones for fat burn, cardio, and peak performance.
TDEE Calculator
Calculate your Total Daily Energy Expenditure — the calories you burn each day from all activity.
Water Intake Calculator
Calculate your recommended daily water intake based on weight and activity.