BMR Calculator

Understanding Basal Metabolic Rate (BMR)

Basal Metabolic Rate is an estimate of the calories your body needs each day to support basic functions like breathing, circulation, and temperature regulation while at rest. It is often used as a starting point for planning nutrition and training goals.

Equation used in this calculator

This tool uses the Mifflin-St Jeor equation, a widely cited formula for estimating resting energy expenditure in adults:

• Men: 10 × weight (kg) + 6.25 × height (cm) - 5 × age (years) + 5
• Women: 10 × weight (kg) + 6.25 × height (cm) - 5 × age (years) - 161

BMR vs. daily calorie needs

BMR is only one part of total daily energy expenditure. Your daily calorie needs also include physical activity, non-exercise movement throughout the day, and the energy used to digest food.

Important limitations

• BMR is an estimate and can vary based on body composition, hormones, and health conditions.
• Equations are less accurate for very muscular people, older adults, and during pregnancy.
• For medical or nutrition planning, consult a qualified healthcare professional.

Sources

• Mifflin MD, et al. A new predictive equation for resting energy expenditure in healthy individuals (1990)
• NCBI Bookshelf: Non-Exercise Activity Thermogenesis in Human Energy Homeostasis