Your total daily energy expenditure — roughly what you burn in a day, all in. The starting point for any nutrition plan.
This uses the Mifflin-St Jeor equation for basal metabolic rate, then multiplies by an activity factor. It's the formula most dietitians reach for, and it's the one this page uses because it's well validated — not because it's Chiron's own. Chiron doesn't use a fixed equation for your daily target; it reasons from what you actually log.
Every TDEE number, from any calculator, is a population average applied to one person. Real expenditure varies meaningfully between two people with identical stats. Treat it as a starting hypothesis, not a measurement.
The honest answer: use it for two weeks, then correct it. If your weight trend doesn't move the way the maths predicted, the maths was wrong about you — and the correction matters far more than the starting estimate.
That correction is the part almost nobody does, because it means keeping meals, training and weight in one place long enough to see the trend.
Chiron watches what actually happens to your weight and adjusts the target — instead of leaving you with a number from a form you filled in once.
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Chiron is a wellness coach, not a medical provider. These calculators use population-level formulas and give you an estimate, not a diagnosis or a prescription. Talk to a doctor before making significant changes if you have a medical condition, are pregnant, or are managing an eating disorder.