Health calculators

BMI, basal metabolic rate and daily calories: what each number is derived from, how much it can be trusted, and where a population-level formula stops describing an individual person.

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A kitchen scale on a wooden counter with uncooked lentils, eggs and a salmon fillet arranged beside it.

Macros Explained: Protein, Carbs, Fat and Online Calculators

A plain guide to turning macro percentages into grams, why protein matters most, and what online calculators can and cannot tell you.

Health calculators 8 min read

A wooden kitchen counter with a glass of water, a notebook, a pen, and a small bowl of nuts and fruit arranged for meal planning.

Daily Calorie Needs: What Online Calculators Get Wrong (and Right)

Learn how daily calorie calculators estimate your needs, why the number drifts over time, and when to see a dietitian rather than trust a formula.

Health calculators 8 min read

A fabric tape measure lies loosely coiled next to a simple digital scale on a pale wooden floor in soft daylight.

What BMI Can and Cannot Tell You: Online Calculators Explained

BMI is the world’s most-used weight number, but it is not a diagnosis. Learn the formula, the band limits, who it misclassifies, and a more useful second check.

Health calculators 8 min read