Health & Fitness Calculators
These health and fitness calculators turn common formulas into quick answers: your body mass index, how many calories you burn at rest and during a normal day, an estimate of body fat from a tape measure, and how much water to aim for. Runners can work out pace and race finish times, and expecting parents can estimate a due date.
Each page explains the formula it uses and where it comes from, along with its limits. These tools give general estimates and are not medical advice. Talk to a doctor or registered dietitian before making major changes to your diet, training or health care.
BMI CalculatorCalculate your body mass index (BMI) in metric or imperial units, see your WHO weight category and the healthy weight range for your height.BMR CalculatorEstimate your basal metabolic rate, the calories your body burns at complete rest, using the Mifflin-St Jeor equation, with Harris-Benedict for comparison.Calorie Calculator (TDEE)Estimate your total daily energy expenditure (TDEE) and how many calories a day to eat to maintain, lose or gain weight, based on your activity level.Body Fat CalculatorEstimate your body fat percentage with the US Navy method from height, neck, waist and hip measurements, plus fat mass, lean mass and fitness category.Ideal Weight CalculatorEstimate an ideal body weight for your height and sex using the Devine, Robinson, Miller and Hamwi formulas, plus the healthy BMI weight range.Water Intake CalculatorEstimate how much water to drink each day from your body weight, daily exercise and climate, in litres, cups and fluid ounces.Pregnancy Due Date CalculatorEstimate your baby's due date from the first day of your last period, the conception date or an IVF transfer date, and see how many weeks pregnant you are.Running Pace CalculatorCalculate your running pace per kilometre and per mile, your speed, and predicted 5K, 10K, half marathon and marathon times from any race result.