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Measure and understand the numbers

Every number in this subject comes with an error bar that the number itself hides. These pages put it back.

Understanding a number

BMI, honestly — what it measures, what it does not, and who it misleads.
Waist circumference — why the waist rather than the scale, and how to measure it.
Body-fat measurements — the methods by accuracy, from DXA to the bathroom scale.
Your scale and how to use it — conditions, frequency, trend versus reading.
Reading a food label — kJ and kcal, per 100 g versus per portion, what "carbohydrate" means in the EU.
How accurate is food tracking — database, portion, cooking, memory: the error stack, and what is good enough.

Computing one

The calculators run entirely in your browser and use the same formulas as the app: daily energy, pace and time to goal, protein, BMI and units.

Educational information, not medical advice. It does not replace a consultation with a doctor or a registered dietitian. Not for people under 18, during pregnancy or breastfeeding, or with a history of an eating disorder — talk to a professional first.