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Basal Metabolic Rate Calculator 1,680 cal/day at rest LOW NORMAL HIGH V.HIGH Your body burns calories even while you sleep

BMR Calculator

Calculate your Basal Metabolic Rate — calories burned at rest.

This tool is for informational purposes only. Consult a qualified healthcare professional for medical advice.

Understanding Basal Metabolic Rate

Your Basal Metabolic Rate (BMR) represents the number of calories your body needs to perform basic life-sustaining functions while at complete rest. These functions include breathing, circulation, cell production, nutrient processing, and maintaining body temperature. BMR typically accounts for 60-75% of your total daily energy expenditure.

The Mifflin-St Jeor Equation

This calculator uses the Mifflin-St Jeor equation, widely considered the most accurate BMR formula. For men: BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age - 5. For women: BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age - 161.

Factors Affecting BMR

Several factors influence your BMR including age (BMR decreases about 1-2% per decade after age 20), body composition (muscle burns more calories than fat), genetics, hormones (particularly thyroid), and environmental temperature. You can increase your BMR by building muscle through resistance training.

BMR vs TDEE

BMR only accounts for resting metabolism. Your Total Daily Energy Expenditure (TDEE) includes BMR plus calories burned through daily activities, exercise, and digesting food. To calculate TDEE, multiply your BMR by an activity factor ranging from 1.2 (sedentary) to 1.9 (extremely active).

Frequently Asked Questions

BMR stands for Basal Metabolic Rate — the calories your body burns at rest to maintain basic life functions.
BMR is calories at rest only. TDEE includes BMR plus activity, exercise, and digestion, representing total daily calorie burn.
Yes. Building muscle through strength training is the most effective way to increase BMR, as muscle tissue burns more calories than fat.
Age-related muscle loss, hormonal changes, and decreased cellular activity all contribute to lower BMR over time.
No. Eating only at BMR does not account for daily activities. Most people need significantly more than their BMR.
It is accurate within about 10% for most people and is considered the gold standard among prediction equations.
Yes. Extended calorie restriction can lower BMR through metabolic adaptation, which is why crash diets are not recommended.
Generally yes, because men typically have more muscle mass and larger body size, both of which increase BMR.
Caffeine can temporarily increase BMR by 3-11%, but the effect is modest and short-lived.
Thyroid hormones are the primary regulators of BMR. Conditions like hypothyroidism can significantly lower metabolic rate.

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