BMR Calculator
BMR and energy figures are population-based estimates, not medical requirements.
SeafarerFit provides educational information, health calculators, screening tools and medical-examination preparation resources. It does not provide diagnosis, treatment, medical certification or official determination of fitness for sea service.
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What BMR means
Your basal metabolic rate (BMR) is the energy your body uses at complete rest to keep you alive — breathing, circulation, temperature control and cell repair. Most of your daily energy goes on BMR; the rest is used by movement, work and digesting food.
Methodology
SeafarerFit uses the Mifflin-St Jeor equation, which research has found to be among the more accurate prediction equations for healthy adults:
- Men: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age (years) + 5
- Women: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age (years) − 161
The daily energy requirement multiplies BMR by an activity factor from 1.2 (sedentary) to 1.9 (extremely active). Equations are averages: individual needs can differ by 10% or more. These figures are estimates, not medical requirements.
Next: turn your estimate into a practical target with the daily calorie estimator.
Sources
- Mifflin MD, St Jeor ST et al. — A new predictive equation for resting energy expenditure in healthy individuals (Am J Clin Nutr, 1990) (opens in a new tab) (February 1, 1990)
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