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BMR Calculator for Women

Your Basal Metabolic Rate is the number of calories your body burns at complete rest. Women typically have lower BMR than men due to differences in body composition, but understanding your personal BMR is the foundation for any nutrition plan.

How BMR Differs for Women

Women have lower BMR than men primarily because they carry less muscle mass and more body fat. Muscle is more metabolically active than fat, burning roughly 6 calories per pound per day compared to fat's 2 calories per pound. The Mifflin-St Jeor equation accounts for this with sex-specific formulas, subtracting 161 for women vs adding 5 for men.

Factors That Lower Women's BMR

Several factors can reduce BMR in women: chronic low-calorie dieting (metabolic adaptation), loss of muscle mass from insufficient protein or resistance training, hormonal changes during menopause, and thyroid dysfunction. The best strategy to maintain or increase BMR is regular resistance training combined with adequate protein intake.

Frequently Asked Questions

What is the average BMR for a woman?
The average BMR for adult women is approximately 1,200-1,400 calories per day, though it varies significantly based on age, weight, height, and body composition. Active women with more muscle mass will have higher BMRs.
Does dieting lower BMR?
Yes. Prolonged calorie restriction can lower BMR by 10-20% through metabolic adaptation. The body becomes more efficient at using energy when calories are consistently low. Periodic diet breaks and maintaining muscle through resistance training help minimize this effect.

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