Health & fitness

BMI, daily calorie needs and other health and fitness calculators.

9 tools

• BMI calculator

  Calculate your body mass index from weight and height, see your WHO weight category and the healthy weight range for your height.

• Ideal weight calculator

  Find your ideal body weight for your height and sex using the Devine, Robinson, Miller and Hamwi formulas, plus the healthy BMI weight range.

• Body fat calculator

  Estimate your body fat percentage from neck, waist and hip measurements using the U.S. Navy method, plus fat mass and lean body mass.

• Calorie calculator

  How many calories you need a day to maintain, lose or gain weight — estimated with the Mifflin–St Jeor equation and your activity level.

• Water intake calculator

  Work out how much water to drink a day based on your weight, exercise and hot weather — in ounces, liters and cups.

• Running pace calculator

  Find your pace per mile or kilometer and your speed from distance and time, plus predicted finish times for a 5K, 10K, half marathon and marathon.

• Sleep calculator

  Work out what time to go to bed to wake up refreshed, or when to set your alarm, based on 90-minute sleep cycles.

• Pregnancy due date calculator

  Estimate your due date and how many weeks pregnant you are from the first day of your last period, adjusted for cycle length.

• Ovulation calculator

  Estimate your ovulation date and most fertile days from the first day of your last period and your cycle length.