Health Hub
Calories, macros, body composition and training zones — all estimates.
Every tool here is a population estimate from a published formula, not a medical assessment. They ignore individual variation, medication and any existing condition. Talk to a doctor before acting on anything that matters.
About the Health Hub
The Health Hub applies published clinical formulas — Mifflin-St Jeor for daily calories, the US Navy circumference method for body fat, Tanaka for maximum heart rate, Naegele’s rule for due dates. Each tool states which formula it uses and how far it can be trusted, because the honest answer for all of them is "roughly". These are population averages: two people with identical height, weight and age can have genuinely different needs, and no equation can see muscle mass, medication or a medical condition.
Questions
How accurate are these calculators?
They are estimates from published formulas, typically within about 10% for most people and further out at the extremes. Track real outcomes over a few weeks and adjust from what actually happens rather than trusting the number.
Can I use these instead of seeing a doctor?
No. They are arithmetic, not diagnosis. Anything involving a medical condition, medication, pregnancy or a significant change to how you eat or train should go through a professional.
Why does BMI say I am overweight when I am fit?
Because BMI only knows your height and weight — it cannot tell muscle from fat. Muscular people routinely score "overweight". The Body Fat tool estimates composition instead, which is more informative.