Calculate your Basal Metabolic Rate (BMR) to understand how many calories your body burns at rest. Essential for weight management and fitness planning.
Your Basal Metabolic Rate (BMR) represents the minimum amount of energy (measured in calories) your body requires to function while at rest. Even when you are sleeping or sitting perfectly still, your body is busy pumping blood, breathing, and repairing cells. Our BMR Calculator uses the scientifically validated Mifflin-St Jeor equation to give you a precise estimate of these baseline needs.
Knowing your BMR is the first step toward any fitness or weight management goal. If you want to lose weight, you need to consume fewer calories than your Total Daily Energy Expenditure (TDEE). If you want to gain muscle, you need a surplus. By combining this tool with our Age Calculator to ensure your inputs are precise, you can create a highly customized nutrition plan.
While BMR tells you how much energy you burn, the BMI Calculator tells you if your weight is in a healthy range for your height. Both are useful metrics, but BMR is more specific to your metabolic health and daily caloric requirements.
The Mifflin-St Jeor equation used here is widely considered the most accurate for the general population. However, factors like muscle mass, genetics, and hormonal health can influence your actual metabolic rate. For athletes with high muscle mass, BMR may be slightly underestimated.
Yes, BMR typically decreases as you age. This is often due to a natural reduction in lean muscle mass and changes in hormonal activity. Staying active and strength training can help maintain a higher BMR as you get older.
The most effective way to increase your BMR is by building lean muscle mass. Muscle tissue is more metabolically active than fat tissue, meaning it burns more calories even when you are at rest.