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The Basal Metabolic Rate (BMR) Calculator estimates your basal metabolic rate—the amount of energy expended while at rest in a neutrally temperate environment, and in a post-absorptive state (meaning that the digestive system is inactive, which requires about 12 hours of fasting).
This tool evaluates basal metabolic rate using the standard Mifflin-St Jeor Equation, recognized as a reliable predictive model:
Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in yrs) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in yrs) - 161
Alternative legacy formulas like the revised Harris-Benedict Equation are calculated as follows:
Men: BMR = (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age in yrs) + 88.362
Women: BMR = (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age in yrs) + 447.593
Basal Metabolic Rate (BMR) measures strictly baseline energy expenditure under restrictive clinical conditions (post-absorptive state, total rest, thermal neutrality). Resting Metabolic Rate (RMR) estimates metabolic rate under less strict conditions, usually yielding a slightly higher value.
Sustained intake below your base BMR is generally discouraged without medical supervision. Your body requires these baseline calories to preserve critical organ function and hormone regulation.
Yes. Lean muscle tissue is metabolically active compared to fat mass. Increasing muscle through resistance training elevates your baseline daily calorie consumption even while resting.
Your Basal Metabolic Rate accounts for approximately 60% to 75% of your total daily energy expenditure (TDEE). The remaining portion comes from the thermic effect of food (digestion) and physical activity (both structured exercise and non-exercise activity thermogenesis).
By applying standard activity multipliers to your computed BMR baseline, you get an accurate guideline for managing body weight over time.