Health Calculators
These tools use the standard clinical formulas — Mifflin-St Jeor for metabolic rate, the WHO categories for body mass index, Naegele's rule for pregnancy dating — and each page explains not just how the formula works but where it stops being reliable.
That second part matters. BMI cannot distinguish muscle from fat. Calorie equations carry a margin of error of around 10%. A due date is the centre of a distribution, and only about 4% of babies arrive on it. Knowing the limits of a number is part of using it well.
Nothing here is medical advice, and none of these tools can account for your medical history. Treat the results as a starting point for a conversation with a doctor rather than a conclusion.
Health tools
- BMI CalculatorCalculate your body mass index in metric or imperial units, and see where it falls on the standard scale.
- Calorie CalculatorFind your daily calorie needs from your BMR and activity level, with targets for losing, maintaining, or gaining weight.
- Due Date CalculatorEstimate your due date from your last period, conception date, or a known due date - and see exactly how far along you are.