Health Calculator

BMI, daily calories (BMR/TDEE) and pregnancy due date estimates.

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About Health Calculator

BMI is a population screening figure and carries no information about body composition, so it misreads muscular and older bodies in opposite directions. All three outputs are estimates for planning, not a substitute for a clinician.

Estimate your Body Mass Index, daily calorie needs using the proven Mifflin–St Jeor formula, and a pregnancy due date from your last menstrual period. It brings three common health estimates together so you can plan diet, fitness and milestones quickly.

These figures are informational estimates rather than medical advice — take decisions about your health with a clinician. Calorie targets especially are a starting point to adjust against real results, since activity level is self-reported and easy to overstate.

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Frequently asked questions

How is BMI calculated?

BMI is your weight in kilograms divided by your height in metres squared. The tool also shows the standard category your result falls into (underweight, normal, overweight, obese). The BMI formula is the same worldwide and is used by health organizations as a simple screening tool for potential weight-related health risks. Enter your height and weight in either metric or imperial units and the calculator instantly shows your BMI and its category. Keep in mind BMI doesn't account for muscle mass, bone density, or age, so it's a general guideline rather than a precise measure of health.

What are BMR and TDEE?

BMR is the calories your body burns at rest; TDEE multiplies that by an activity factor to estimate your total daily calorie needs using the Mifflin–St Jeor equation. BMR (Basal Metabolic Rate) represents the minimum calories needed for basic functions like breathing and circulation, while TDEE (Total Daily Energy Expenditure) accounts for exercise and daily activities on top of BMR. The Mifflin–St Jeor formula is a well-researched, accurate method for estimating TDEE based on age, gender, height, weight, and activity level. Knowing your TDEE helps you set realistic calorie targets for weight loss (eat less than TDEE) or weight gain (eat more than TDEE).

Is this medical advice?

No. The results are general estimates for information only. Always consult a qualified healthcare professional for medical decisions. BMI, BMR, TDEE, and estimated due dates are statistical averages that don't account for individual metabolic differences, medical conditions, or pregnancy complications. These calculations are tools for general guidance and self-awareness, not replacements for professional medical evaluation. If you have concerns about your health, weight, or pregnancy, discuss your specific situation with a doctor or healthcare provider who can account for your unique circumstances.

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