The calculator uses the Schofield equation — the same formula the NHMRC and Australian dietitians use for estimating energy needs — and pairs it with Australian Nutrient Reference Values for protein, iron, calcium and other micronutrients. That said, your numbers are a starting point, not a prescription. Real bodies have variables a formula cannot see: sleep quality, gut health, thyroid function, cortisol patterns, and how your metabolism has adapted over the years. After coaching women since 2017, what I keep seeing is that the calculation is the easy part — interpreting it for your actual life is where progress happens.

Three reasons. First, women generally have lower baseline metabolic rates, so calorie needs are different — and under-eating tends to backfire harder. Second, iron requirements stay high until menopause (18 mg vs 8 mg for men) because of menstrual loss. Third, calcium needs jump to 1,300 mg after 50 to protect bone density during the hormonal shift. The macros you’ll see also account for protein needing to go up — not down — in your 40s and 50s to protect muscle mass and support hormonal balance. This is one of the most common things women misread while dieting.

No — and I’d actually steer you away from it. Tracking every gram tends to backfire for busy women juggling work, family and real life. What works is using your numbers as a guide, not a rulebook: hit your protein target most days, build meals that loosely match the macro shape, and pay attention to how your body responds. Small habits done consistently beat perfect tracking done briefly. Good nutrition should fit real life, not fight it. If you want a structured framework rather than guesswork, that’s exactly what coaching is for.