BMR Calculator
Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation. Understand how many calories your body burns at rest.
About this calculator
Your Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic, life-sustaining functions when at rest. This includes processes like breathing, circulation, cell production, and nutrient processing. The BMR calculator uses the Mifflin-St Jeor equation, widely considered one of the most accurate BMR formulas.
Understanding your BMR is a fantastic starting point for any fitness or weight management goal. If you're looking to lose muscle, you'll need to consume fewer calories than your BMR plus your activity level. To gain muscle, you'll generally need to consume more.
It's important to remember that BMR only accounts for calories burned at rest. Your Total Daily Energy Expenditure (TDEE) will be higher, as it includes calories burned through physical activity. Use your BMR as a foundational number, then factor in your daily activities to get a complete picture of your caloric needs.
Formula
For Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5
For Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161
Source: Mifflin MD, St Jeor ST, et al.
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BMR Calculator FAQs
What is the difference between BMR and TDEE?
BMR (Basal Metabolic Rate) is the calories your body burns at complete rest, just to maintain basic life functions. TDEE (Total Daily Energy Expenditure) includes your BMR plus all the calories you burn through physical activity, digestion, and daily tasks.
How accurate is the Mifflin-St Jeor equation?
The Mifflin-St Jeor equation is generally considered one of the most accurate BMR prediction formulas for healthy adults, surpassing older formulas like the Harris-Benedict equation in many studies. However, it is an estimation and not a direct measurement.
Can my BMR change?
Yes, your BMR can change. Factors like age (it tends to decrease with age), sex, body composition (more muscle mass increases BMR), and certain medical conditions can influence it. Regular exercise that builds muscle can help maintain or even slightly increase your BMR.