Health Calculators

Calculate your Body Mass Index (BMI) from height and weight and see your WHO weight category — underweight, normal, overweight or obese. View your ideal weight range and the difference instantly.

Calculate your basal metabolic rate (BMR) and daily calorie needs (TDEE) from age, sex, height and weight using the Mifflin-St Jeor or Harris-Benedict formula. See how many calories you burn at rest.

Estimate your blood alcohol concentration (BAC %) from sex, body weight and your drinks using the Widmark formula. See roughly when you will sober up — for information only, never drink and drive.

Calculate your body fat percentage with the U.S. Navy method, BMI formula or waist-to-hip ratio. View your category classification along with fat mass and lean mass results to track your fitness over time.

Find your daily calorie needs (TDEE), the deficit for weight loss and the calories you burn by activity. A food calorie table of 600+ items helps you plan meals and reach your fitness goals with confidence.

Find your recommended daily water intake from body weight, activity level and special conditions such as pregnancy or hot weather. Results are shown in litres and glasses with simple when-to-drink guidance.

Calculate insulin resistance with the HOMA-IR formula from your fasting glucose and fasting insulin. Get an instant risk-category interpretation to discuss with your doctor — for information, not diagnosis.

Find your ideal body weight by height and sex using the Hamwi, Devine, Robinson and Miller formulas. Compare all four results against the healthy BMI range and see how far you are from your target.

Find your ovulation day and fertile window from your last period date and cycle length. A day-by-day fertile calendar highlights your most fertile days to help with conception planning, all in your browser.

Calculate baby and child height, weight and BMI percentiles using WHO growth standards for ages 0 to 19. Separate charts for boys and girls help you track healthy growth and spot any concerns early.

Predict your next periods, ovulation day and fertile window from your last period date and average cycle length. View a clear three-month calendar to plan ahead — a simple, private menstrual cycle tracker.

Find your estimated due date, how many weeks pregnant you are and your current trimester from your last menstrual period. Follow week-by-week baby development and key milestones throughout your pregnancy.

Find the ideal time to wake up or go to bed based on 90-minute sleep cycles. Choose your age group and sleep-onset delay for personalised bedtime and wake-up times that leave you refreshed, not groggy.

Find all 10 baby mental leaps, fussy and sunny periods from your baby's birth date, with premature corrected-age support. A clear timeline helps you understand developmental jumps and difficult weeks.