🔥Basal Metabolic Rate Calculator

What is basal metabolic rate?

Basal metabolic rate is the amount of energy consumed to maintain life even at rest, such as maintaining body temperature, breathing, and heart rate. Basal metabolic rate is expressed in kilocalories per day (kcal/day) and varies by gender, age, and body composition.

• Difference from daily calorie expenditure：Daily calorie expenditure is your basal metabolic rate plus the calories burned from physical activity and digestion. People with higher activity levels will have a total calorie expenditure greater than their basal metabolic rate.

Revised Harris-Benedict equation calculation formula

The revised Harris-Benedict equation is a basal metabolic rate estimation formula revised in 1984. It is calculated by multiplying weight (kg), height (cm), and age by gender-specific coefficients.

• Equation for males：Male basal metabolic rate is calculated as: 88.362 + 13.397 × weight + 4.799 × height − 5.677 × age
• Equation for females：Female basal metabolic rate is calculated as: 447.593 + 9.247 × weight + 3.098 × height − 4.330 × age

Why do results differ between sites?

Basal metabolic rate calculation results differ between sites because each site uses a different estimation formula. For example, a 30-year-old male who is 170 cm tall and weighs 65 kg would have approximately 1,605 kcal using the revised Harris-Benedict equation, but approximately 1,568 kcal using the Mifflin-St Jeor equation.

• Deviation between estimated and actual values：Since estimation formulas are based on average relationships derived from measurement data of many people, individuals with higher or lower muscle mass may experience differences between the estimated basal metabolic rate and their actual value.