Nutrition & DietMifflin-St Jeor & Harris-Benedict

BMR Calculator

Computes Basal Metabolic Rate (BMR) across Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle equations, representing energy expended at total rest.

Nutrition & Diet• Mifflin-St Jeor & Harris-Benedict

BMR Calculator

Calculate your Basal Metabolic Rate (BMR) - the calories burned at complete rest.

Gender

Age10 – 120 yrs

yrs

Height50 – 250 cm

Weight20 – 350 kg

Basal Metabolic Rate (BMR):

1,699 Calories/day

Basal Metabolic Rate (BMR)Average BMR (1400-1800)

1,699kcal/day

Average BMR (1400-1800)

Low Resting Burn (<1400)

1000-1399

Average BMR (1400-1800)

1400-1800

Elevated BMR (>1800)

1801-2500

Daily calorie needs based on activity level:

Sedentary: little or no exercise2,039 kcal

Exercise 1-3 times/week2,336 kcal

Exercise 4-5 times/week2,489 kcal

Daily exercise or intense exercise 3-4 times/week2,633 kcal

Intense exercise 6-7 times/week2,930 kcal

Very intense exercise daily, or physical job3,228 kcal

Evidence-based estimations. Consult a physician for personalized guidance.

Clinical Formula & Calculation Standard

Official clinical definitions and validated mathematical models

Basal Metabolic Rate Clinical Formulations

Mifflin-St Jeor: 10W + 6.25H - 5A + s (s = +5 for male, -161 for female) Revised Harris-Benedict (1984): Men 13.397W + 4.799H - 5.677A + 88.362 | Women 9.247W + 3.098H - 4.330A + 447.593 Katch-McArdle: BMR = 370 + 21.6 × LBM (kg)

Basal Metabolic Rate reflects the baseline caloric expenditure needed to sustain autonomic physiological life (brain, liver, heart, kidneys) in a thermoneutral environment after 12 hours of fasting.

Clinical Insights & Practical Usage

BMR accounts for approximately 60%–75% of total daily energy expenditure in sedentary adults.
Adaptive thermogenesis: prolonged severe hypocaloric diets can downregulate BMR by 10%–25% beyond predicted weight-loss values.
Core body temperature elevates BMR by approximately 7% for every 1°F rise in body temperature.

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