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Health & Fitness

Free Health Calculators

BMI, calorie needs, water intake, ideal weight, heart rate zones and more — all your health metrics calculated instantly, free and private.

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⚖️ BMI 🔥 Calories 💧 Water 🎯 Ideal Weight ❤️ Heart Rate 📊 Body Fat 😴 Sleep 🥗 Macros
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BMI Calculator
Body Mass Index — find your BMI and healthy weight range
♂ Male
♀ Female
Enter your details to calculate BMI
Calorie Calculator (TDEE)
Total Daily Energy Expenditure — how many calories you need per day
♂ Male
♀ Female
Enter details to calculate daily calories
Water Intake Calculator
Calculate your daily water requirement based on weight, activity and climate
Enter your details to calculate water intake
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Ideal Weight Calculator
Find your ideal weight using 4 different formulas (Hamwi, Devine, Robinson, Miller)
♂ Male
♀ Female
Note: These are estimates. Body composition, muscle mass and bone density all affect your ideal weight.
Enter height and gender to calculate
Heart Rate Zone Calculator
Find your max heart rate and 5 training zones based on your age
Tip: Measure resting HR first thing in the morning before getting out of bed.
Enter age to see your heart rate zones
Body Fat % Calculator
Estimate body fat percentage using the US Navy tape measure method
♂ Male
♀ Female
Enter measurements to calculate
Sleep Calculator
Find the best bedtime and wake-up times based on 90-minute sleep cycles
Choose a wake or sleep time to calculate
Macro Nutrient Calculator
Calculate your daily protein, carbs and fat targets based on your goal
Enter calories and diet type to calculate macros
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