Calculators
Six tools that show their working. Each one names the equation it uses and says where that equation stops being reliable, because a number without its error bars is worse than no number.
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BMI calculator
Work out your body mass index, see the healthy weight range for your height, and read what BMI cannot tell you.
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Calorie calculator
Maintenance calories, the deficit for weight loss and a macro split — every step of the calculation, not just the final number.
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Protein calculator
Your daily protein intake in grams, set by what you are actually asking your body to do.
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Ideal weight calculator
Four ideal body weight formulas side by side, plus the healthy weight range that is the more defensible target.
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Body fat calculator
Estimate your body fat percentage with the US Navy tape method — three measurements, and an honest account of the error bars.
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Water intake calculator
Your daily water intake from body weight, exercise and climate — and why thirst tracks the requirement better than this number does.