Health & Fitness Calculators
Calculate your BMI, daily calorie needs and pregnancy due date with our free health tools.
All Health Calculators
About Health Calculators
Body Mass Index (BMI) is calculated as weight (kg) divided by height (m) squared. A healthy BMI range is 18.5 to 24.9. Our calculator supports both metric (cm/kg) and imperial (inches/lbs) units. BMI is a useful screening tool but does not account for muscle mass or body composition.
Daily calorie needs vary by age, gender, weight, and activity level. The Mifflin-St Jeor equation provides the most accurate estimate of Basal Metabolic Rate (BMR). A 500-calorie daily deficit typically results in approximately 0.5kg of weight loss per week — a safe and sustainable rate.
Pregnancy due dates are calculated as 280 days (40 weeks) from the first day of the last menstrual period — the standard Naegele's rule. Only about 5% of babies arrive on their exact due date. The 20-week anatomy scan is a key milestone during the second trimester.
Official sources: Health Direct BMI
Built by Konstantin Iakovlev. Data sourced from official Australian government publications.