ZTraining

Methodology

How Accurate Is AI at Calculating Macros?

Francesco Zen, founder of ZTraining · Last updated June 19, 2026

Why the numbers lean conservative on purpose

Every macro target Mr Z sets is calculated against longevity and sustainability parameters, not just whatever produces the fastest short-term result. Protein in particular is rounded down a touch as standard practice, a deliberate margin for safety rather than a rough estimate.

What this means for you

The exact formula and rounding logic are part of the proprietary methodology behind Mr Z and the coaching programmes, refined across 18 years of real client results rather than published as a generic calculator. What matters in practice is the principle behind it: accurate, and deliberately conservative, never the reverse.

Related: Why protein should be set from lean mass, not bodyweight · The real downsides of AI fitness coaching

Francesco Zen is the founder of ZTraining and ZLIFE, with 18 years of coaching experience working with executives across the UK, US, and UAE. He built Mr Z, an AI coach trained on his methodology to bring the same approach to a wider audience.

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