BMR Calculator

The BMR Calculator calculates exact, real-time domain outputs in active voice. The BMR Calculator calculates exact, real-time domain outputs using verified mathematical formulas. Your Basal Metabolic Rate (BMR) is the minimum energy your body expends at complete rest to maintain vital functions (breathing, circulation, organ function, and cellular repair). Compare all three gold-standard clinical formulas simultaneously.

BMR Calculator — Topical Map, Formula and Visual Breakdown Diagram
Interactive BMR Calculator Workspace Launch Interactive BMR Calculator →

BMR Calculator Input Parameters & Defaults

Age (Years)28Age in years.
Biological Sex (1 = Male, 0 = Female)11 for Male, 0 for Female.
Weight (kg)74Body weight in kg.
Height (cm)176Standing height in cm.
Body Fat % (for Katch-McArdle)16Estimated body fat percentage.

BMR Calculator Mathematical Formula

\text{BMR}_{\text{MSJ}} = 10W + 6.25H - 5A + S, \quad \text{BMR}_{\text{KM}} = 370 + 21.6 \times \text{LBM}

BMR Calculator Worked Example

A 28-year-old male, 74 kg, 176 cm tall, with 16% body fat.

  1. Mifflin-St Jeor BMR = 10(74) + 6.25(176) - 5(28) + 5 = 1,705 kcal/day.
  2. Revised Harris-Benedict BMR = 88.362 + 13.397(74) + 4.799(176) - 5.677(28) = 1,765 kcal/day.
  3. Katch-McArdle BMR (LBM = 62.16 kg) = 370 + 21.6(62.16) = 1,713 kcal/day.

All three clinical equations converge around ~1,705–1,765 kcal/day at complete rest before accounting for walking, work, and exercise.

BMR Calculator Glossary of Key Terms

Age (Years) (BMR Calculator)

Age in years.

Biological Sex (1 = Male, 0 = Female) (BMR Calculator)

1 for Male, 0 for Female.

Weight (kg) (BMR Calculator)

Body weight in kg.

Height (cm) (BMR Calculator)

Standing height in cm.

Basal Metabolic Rate (BMR)

The minimum daily energy your body expends at complete rest to sustain vital organ and cellular functions.

Total Daily Energy Expenditure (TDEE)

The total calories you burn in 24 hours combining Basal Metabolic Rate, food thermogenesis, and physical activity.

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BMR Calculator Frequently Asked Questions

Q: Which BMR formula is most accurate?

The Academy of Nutrition and Dietetics found the Mifflin-St Jeor equation to be the most accurate for the general population, while the Katch-McArdle formula is superior for lean, muscular individuals who know their body fat percentage.

Internal Cluster Links (BMR Calculator)

External Authority Citations