Find your Total Daily Energy Expenditure and Basal Metabolic Rate using the scientifically validated Mifflin-St Jeor formula.
| Goal | Deficit/Surplus | Calories/Day | Expected |
|---|
Mifflin-St Jeor: Male = 10×kg + 6.25×cm − 5×age + 5 | Female = 10×kg + 6.25×cm − 5×age − 161
Your Total Daily Energy Expenditure is the total number of calories your body burns in a day — including your resting metabolism, digestion, and all physical activity. Knowing your TDEE lets you set a calorie target with confidence instead of guessing. Read the full TDEE explainer →
A deficit of ~500 kcal/day below TDEE predicts roughly 1 lb/week of fat loss (since 1 lb ≈ 3,500 kcal). The real-world result varies based on water retention, muscle, and logging accuracy.
Track it automatically. HealthOS calculates your daily TDEE from your connected devices and shows your real caloric balance every day — no manual entry.