Free Health Calculators — CalcSphere
Free health calculators to help you understand your body and make informed wellness decisions. Calculate your BMI to assess your weight category, estimate your daily calorie needs based on your activity level, find your ideal body weight range, determine how much water you should drink each day, or calculate your maximum heart rate and training zones. CalcSphere's health calculators are based on medically accepted formulas and research. We offer BMI, calorie, ideal weight, water intake, pregnancy due date, and heart rate zone calculators — all completely free, mobile-friendly, and instant. Perfect for fitness enthusiasts, healthcare students, dietitians, personal trainers, and anyone on a health improvement journey.
BMI Calculator
Calculate BMI, weight category, ideal weight range, and exactly how mu...
Calorie Calculator
Calculate daily calorie needs (TDEE) based on age, weight, height, and...
Ideal Weight Calculator — Healthy Weight for Your Height
Calculate your ideal body weight for your height, gender, and body fra...
Water Intake Calculator
Calculate how much water to drink daily based on weight and activity l...
Pregnancy Due Date Calculator
Estimate your baby's due date and current pregnancy week from your las...
Heart Rate Zone Calculator
Find your max heart rate and all 5 training zones for optimal workout ...
Body Fat Calculator — Calculate Body Fat Percentage
Calculate your body fat percentage using the US Navy method. Enter nec...
Sleep Calculator — Best Time to Wake Up or Sleep
Calculate the best time to wake up or go to sleep based on 90-minute s...
Running Pace Calculator — Speed, Distance & Time
Calculate running pace, finish time, or distance. Enter any two values...
Calorie Deficit Calculator — Lose Weight Fast
Free calorie deficit calculator. Calculate your daily calorie deficit ...
Macro Calculator — Protein, Carbs & Fat Daily Targets
Free macro calculator. Calculate your daily protein, carbohydrate, and...
Ovulation Calculator — Find Your Fertile Window
Free ovulation calculator. Find your fertile window and most likely ov...