Health
BMI, calories, ideal weight and body fat, daily water goal, pregnancy weeks and due date, fertile window, ovulation and pet pregnancy calculators.
Calculate your BMI from weight and height in metric or imperial units and see your WHO category, from underweight to obesity class III. Free and instant.
Body Fat CalculatorEstimate your body fat percentage with the US Navy tape method from height, neck, waist and hip, and see your fat mass, lean mass and fitness category.
Calorie Calculator (BMR and TDEE)Estimate your BMR and daily calories (TDEE) with Mifflin-St Jeor, Harris-Benedict or Katch-McArdle, plus targets to lose or gain weight and a macro split.
Daily Water Intake CalculatorFind your daily water goal from weight, exercise and climate, then get an hourly drinking schedule that fits your wake-up and bedtime. Free, instant and private.
Dog and Cat PregnancyEstimate the due date of a pregnant dog or cat from the mating date and follow the gestation milestones, from implantation to birth. Educational, not veterinary advice.
Fertile Window CalculatorEstimate your fertile days with the calendar method, using your shortest and longest cycle, and see the fertile window and the next period on a monthly calendar.
Ideal Weight CalculatorEstimate your ideal body weight from height and sex with the Devine, Robinson and Miller formulas and see the healthy weight range for a BMI of 18.5 to 24.9.
Ovulation CalculatorPredict your ovulation day from your cycle length and see the fertile window with the conception chance for each day. Includes a calendar for the next cycles.
Pregnancy CalculatorFind your gestational age in weeks and days and your due date from the last menstrual period, ultrasound, conception date or IVF transfer, with a trimester timeline.
The health section brings together nine tools. The BMI calculator places your Body Mass Index in the World Health Organization ranges for adults; the calorie calculator estimates your basal and daily energy needs with goals and macronutrients; the ideal weight calculator compares classic formulas with the healthy BMI range; the body fat calculator applies the US Navy method to your body measurements; the daily water goal spreads your intake across your waking hours; the pregnancy calculator gives the gestational weeks and the estimated due date; the fertile window and ovulation calculators map your cycle on a calendar; and the pet pregnancy calculator estimates when a dog or a cat is due to give birth.
All results are informative and do not replace the advice of a doctor or, for animals, of a veterinarian. BMI is only a screening indicator, and due dates, fertile days and ovulation are statistical estimates that vary from person to person and from animal to animal. None of these tools diagnoses a condition or works as a contraceptive method. Talk to a health professional about any concern. The calculators are free and need no sign-up.