CaloryStat BMR

BMR Calculator

Find your Basal Metabolic Rate — the calories your body burns at complete rest.

Your BMR (Mifflin-St Jeor)
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What BMR Measures

Basal Metabolic Rate is the energy your body needs to stay alive at complete rest — breathing, circulation, cell repair. It excludes digestion and movement entirely.

BMR is the foundation every other calorie calculator on this site builds on, including TDEE, deficit, and surplus targets.

Choosing a Formula

Mifflin-St Jeor (1990) is the most validated equation for healthy adults and is the default here.1 Harris-Benedict (revised 1984) is an older alternative that tends to run slightly higher.2

Katch-McArdle uses lean body mass instead of total weight, which makes it more accurate for lean or muscular individuals — but it requires knowing your body fat percentage first.3

Mifflin (men): BMR = 10W + 6.25H − 5A + 5 Mifflin (women): BMR = 10W + 6.25H − 5A − 161 Harris-Benedict (men): BMR = 88.362 + 13.397W + 4.799H − 5.677A Harris-Benedict (women): BMR = 447.593 + 9.247W + 3.098H − 4.330A Katch-McArdle: BMR = 370 + 21.6 × Lean Mass (kg)

Frequently Asked Questions

What's the difference between BMR and TDEE?

BMR is calories at complete rest. TDEE adds activity on top of BMR.

Which formula should I use?

Mifflin-St Jeor for most people. Switch to Katch-McArdle if you know your body fat percentage.

Sources

  1. Mifflin MD, St Jeor ST, et al. "A new predictive equation for resting energy expenditure in healthy individuals." Am J Clin Nutr, 1990;51(2):241-247.
  2. Roza AM, Shizgal HM. "The Harris Benedict equation reevaluated: resting energy requirements and the body cell mass." Am J Clin Nutr, 1984;40(1):168-182.
  3. Katch VL, McArdle WD. Nutrition, Weight Control, and Exercise, 4th ed., 1996.