7 tools Health
Body mass index and daily energy needs, using published formulas.
Your files stay on your device. The tool works directly in your browser, using your device to process your files. Nothing is sent to our servers, and we never receive, store, or see your files or figures.
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BMI calculator
Calculate body mass index from height and weight in metric or imperial units, see which WHO category it falls in, and get the healthy weight range for your height.
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Calorie calculator
Estimate the calories you burn each day using the Mifflin-St Jeor equation, with targets for maintaining, losing or gaining weight.
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BMR calculator
Calculate basal metabolic rate using Mifflin-St Jeor, Harris-Benedict or Katch-McArdle, and see total daily burn at every activity level.
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Ideal weight calculator
See what the four classic ideal-weight formulas say for your height, how far apart they are, and the BMI range that is more useful than any of them.
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Body fat calculator
Estimate body fat percentage from a tape measure using the US Navy method, with fat and lean mass broken out and a BMI-based cross-check.
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Macro calculator
Turn a daily calorie target into grams of protein, carbohydrate and fat, with presets for balanced, low-carb, endurance and ketogenic splits.
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Due date calculator
Estimate a due date from a last period, a conception date or a known due date, with current gestational age, trimesters and key milestones.
Published formulas, stated plainly
Health calculators are only as good as the research behind them, so each tool here names the equation it uses and where it came from. The BMI calculator uses the World Health Organization's adult cut-offs. The calorie calculator uses Mifflin-St Jeor, which the Academy of Nutrition and Dietetics found to be the most reliable predictive equation for resting energy expenditure.
Your measurements stay yours
Height, weight, age and activity level are entered and calculated in your browser. Nothing is sent to a server, nothing is stored, and there is no account to create. Health data is among the most sensitive information a person has, and the safest way to handle it is not to receive it at all.
What these tools cannot do
Every equation here describes population averages. None of them can see your body composition, your medical history, your medication or your circumstances. A BMI in the overweight range means something quite different for a powerlifter than for a sedentary office worker, and neither is diagnosed by a number.
Use these as a starting point for a conversation, not as a substitute for one. Anything that would change how you eat, train or medicate belongs with a doctor or a registered dietitian.
