In everyday use, often yes. Technically, measurement conditions can differ.
BMR Calculator
Estimate basal metabolic rate with formula choice and optional lean-mass inputs.
More context when body composition is known.
Mifflin-St Jeor remains useful as the default, but lean-mass-based models may offer a better fit when body-fat percentage is known or reasonably estimated. They are still approximations, not direct measurements.
Choose the equation based on how much detail you have.
- Select sex, age, height, weight and the metabolic model you want to use.
- If you want Katch-McArdle or Cunningham, open advanced options and enter body-fat percentage.
- Read BMR as a resting estimate, not a standalone diet prescription.
When it is worth moving beyond default Mifflin
Lean-mass-based equations can be more informative when body composition is far from average, such as in muscular individuals, recomposition phases or cases where body-fat percentage is reasonably known.
This does not eliminate error, but it helps avoid treating every kilogram of body weight as if it carried the same metabolic meaning.
- No body-fat data: start with Mifflin-St Jeor.
- Body-composition available: compare Katch-McArdle and Cunningham.
- Clinical precision still requires indirect calorimetry.