Metabolic Rate Calculator

What Is Your Metabolic Rate?

Your metabolic rate is the speed at which your body converts food into energy. Resting metabolic rate (RMR) represents the calories burned at rest for basic functions and accounts for 60–70% of total daily energy expenditure. This calculator estimates your RMR using the Mifflin-St Jeor equation, which factors in weight, height, age, and sex. The result shows the minimum calories your body needs each day before any physical activity is added.

Factors That Influence Metabolic Rate

Lean muscle mass is the largest controllable factor – muscle burns roughly three times more calories per pound than fat at rest. Age slows metabolism by about 1–2% per decade, primarily through muscle loss. Men typically have higher metabolic rates than women due to greater average muscle mass. Thyroid function plays a significant hormonal role, and both hypothyroidism and hyperthyroidism can meaningfully alter metabolic rate. Chronic calorie restriction can temporarily lower metabolism by 10–15% through adaptive thermogenesis.

Boosting Your Metabolism

Resistance training is the most effective long-term strategy because adding muscle raises RMR permanently. Eating adequate protein increases the thermic effect of food – your body uses 20–30% of protein calories for digestion compared to 5–10% for carbs and 0–3% for fat. Staying well-hydrated, sleeping 7–9 hours per night, and avoiding prolonged extreme diets all support a healthy metabolic rate. Claims about specific "metabolism-boosting foods" are generally exaggerated – the effects of green tea, spicy food, or apple cider vinegar on metabolism are small and temporary.

Frequently asked questions