BMR Calculator
Estimate your Basal Metabolic Rate (BMR) using your age, sex, height and weight. You can also view a rough daily calorie estimate based on a sedentary activity level.
Your Estimated Results
The daily estimate uses a multiplier of 1.2. It is a rough starting estimate, not a personalized calorie target. Actual energy needs vary with activity, health and other factors.
What Is BMR?
BMR stands for Basal Metabolic Rate. It estimates the energy your body uses to maintain essential functions while at rest, including breathing, circulation and maintaining body temperature. BMR is usually expressed as calories per day.
How Is BMR Calculated?
This calculator uses the Mifflin-St Jeor equation, which estimates resting energy needs from weight, height, age and sex.
For males:
BMR = (10 × weight in kg) + (6.25 × height in cm)
− (5 × age) + 5
For females:
BMR = (10 × weight in kg) + (6.25 × height in cm)
− (5 × age) − 161
Example BMR Calculation
For an adult male aged 30, weighing 70 kg and measuring 175 cm:
BMR = (10 × 70) + (6.25 × 175) − (5 × 30) + 5
The estimated BMR is approximately 1,649 calories per day. This is an equation-based estimate, not a direct measurement.
BMR vs. TDEE
BMR estimates energy used at rest. Total Daily Energy Expenditure (TDEE) estimates the total energy used throughout the day, including physical activity and other daily activities. A sedentary multiplier can provide a rough estimate of daily needs, but it will not fit every person's circumstances.
What Can Affect Calorie Requirements?
Energy requirements vary with physical activity, body composition, age, health, medications and other individual factors. A formula cannot fully account for all these differences, so calculated values should be treated as estimates.
Frequently Asked Questions
What does BMR stand for?
BMR stands for Basal Metabolic Rate. It estimates the energy needed to maintain basic physiological functions while at rest.
Is BMR the same as daily calorie needs?
No. BMR estimates resting energy use. Daily calorie needs also include physical activity and other energy expenditure.
How accurate is a BMR calculator?
It provides an estimate using a population-based equation. Individual energy needs can differ from the calculated result.
Does this calculator estimate calories for exercise?
No. The BMR result estimates energy used at rest. The additional sedentary estimate uses a fixed multiplier and does not specifically calculate exercise calories.
Can teenagers use this calculator?
This tool is designed for adults aged 18 and older. Children and teenagers have different nutritional and growth needs and should use age-appropriate guidance from a qualified healthcare professional.
Related Health & Fitness Calculators
Explore our other calculators for general health, fitness and nutrition estimates.