Man, 30 years, 175 cm, 70 kg (Mifflin-St Jeor)
- Input
- M, 30 anos, 175 cm, 70 kg
- Expected output
- TMB ≈ 1650 kcal/dia
9.99×70 + 6.25×175 − 4.92×30 + 5 = 699.3 + 1093.75 − 147.6 + 5 = 1650.45, rounded to 1650.
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BMR and basal metabolism
Basal metabolic rate is the energy the body spends at complete rest just to keep basic functions running: breathing, heartbeat, cell repair. There is no single formula to estimate it, and which one you pick changes the final number before any activity is even added.
9.99×70 + 6.25×175 − 4.92×30 + 5 = 699.3 + 1093.75 − 147.6 + 5 = 1650.45, rounded to 1650.
The same formula with −161 instead of +5 for the female sex: 9.99×60 + 6.25×165 − 4.92×30 − 161 = 1321.55, rounded to 1322.
Cunningham was originally derived from athletes and tends to run higher; the 159 kcal gap between the two formulas shows how much the choice of equation matters, without even changing the person's body.
In everyday use, often yes. Technically, measurement conditions can differ.
BMR is the energy spent at complete rest, with no activity added. TDEE is BMR multiplied by an activity factor, covering the whole day's expenditure including exercise, work and everyday movement. BMR is the starting point of the calculation, TDEE is the final result.
Because it only needs weight, height, age and sex, without requiring an intermediate body fat estimate. The other two options, Katch-McArdle and Cunningham, use lean mass instead of total weight, which can be more representative for someone who already has a reliable body composition measurement, but it depends on the quality of that measurement.
Only if you want to use Katch-McArdle or Cunningham, the two lean-mass-based formulas. For Mifflin-St Jeor, the calculator's default, weight, height, age and sex are enough, with no body composition estimate involved.
No, by definition. BMR represents only the cost of complete rest, with no movement added; it is the activity factor, applied afterward in the TDEE calculation, that accounts for how much you move throughout the day.
Medical disclaimer: this is an educational estimate for adults aged 20+. BMR equations can be inaccurate for individuals; do not use this as a diet prescription without professional guidance.
BMR estimates energy at rest. When body-fat percentage is provided, the tool also estimates lean mass and compares models that may better reflect people whose body composition differs from the average built into simpler equations.
Mifflin-St Jeor uses weight, height, age and sex coefficient. It is the default reference when body-composition data is not available.
Sex, age, height, weight and body-fat percentage stay in your browser and are not sent to analytics.