Body Metrics
BMI, body fat, ideal weight.
BAC Calculator
Estimate your blood alcohol concentration with the Widmark formula. Enter weight, sex, drinks and hours. An estimate only, never a reason to drive.
Blood Pressure Category
Enter your systolic and diastolic numbers to find your blood pressure category using the AHA/ACC 2017 chart, from Normal to Hypertensive Crisis.
BMI Calculator
Free BMI calculator. Enter your weight and height in metric or imperial units to get your Body Mass Index and WHO weight category instantly.
Body Fat Calculator
Estimate your body fat percentage with the US Navy tape method. Enter height, neck and waist (plus hip for women) to see your body fat and category.
Body Surface Area Calculator
Free body surface area calculator. Enter height and weight to get your BSA in m2 using the Mosteller, DuBois, Haycock or Gehan-George formula.
Due Date Calculator
Estimate your pregnancy due date from your last menstrual period using Naegele's rule. See how far along you are, your trimester and conception date.
eGFR Calculator
Free eGFR calculator using the race-free CKD-EPI 2021 creatinine equation. Enter creatinine, age and sex to get your eGFR and CKD stage instantly.
Ideal Weight Calculator
Find your ideal body weight from height and sex using the Devine, Robinson, Miller and Hamwi formulas, plus a healthy weight range from BMI.
Lean Body Mass Calculator
Estimate your lean body mass from weight, height and sex with the Boer formula, or enter a measured body fat percent for a direct figure.
Ovulation Calculator
Estimate your ovulation date and fertile window from your last period. Adjust for your cycle length to see your most fertile days and your next period.
Waist to Hip Ratio Calculator
Free waist to hip ratio calculator. Enter your waist and hip measurements to get your WHR and the WHO health risk category for men and women.