Health Calculators
Free online health calculators for BMI, calorie needs, body fat percentage, ideal body weight, daily water intake, heart rate training zones, and more. Use these tools to understand your body metrics, set realistic fitness targets, or check key health indicators without a doctor visit. All calculators run instantly in your browser with no account needed.
BMI Calculator
Calculate your Body Mass Index (BMI) and find out what your result means for your health.
BMR & Calorie Calculator
Calculate your Basal Metabolic Rate and daily calorie needs.
Body Fat Percentage Calculator
Estimate your body fat percentage using the U.S. Navy tape measure method.
Ideal Body Weight Calculator
Calculate ideal body weight using Devine, Robinson, Miller, and Hamwi formulas.
Calorie Deficit Calculator
Calculate the calorie deficit needed to reach your weight loss goal.
Water Intake Calculator
Calculate your recommended daily water intake based on weight and activity.
Heart Rate Zone Calculator
Calculate your 5 target heart rate zones for optimal training.
Due Date Calculator
Calculate your estimated due date based on last menstrual period.
Ovulation Calculator
Estimate your ovulation window and most fertile days.
Sleep Calculator
Calculate the best bedtime or wake time based on 90-minute sleep cycles.