Guides
Plain-English explanations of the topics behind our tools, with worked examples.
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Understanding BMI: What Your Number Means and Its Limits
How BMI is calculated, what the WHO categories mean, why BMI can mislead for some people, and which measurements add a fuller picture.
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How Many Calories Do I Need? BMR, TDEE and Macros
How daily calorie needs are estimated with the Mifflin-St Jeor equation and activity factors, plus how to turn calories into protein, carbs and fat.