Health & Fitness
BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at rest.
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What is BMR Calculator?
BMR (Basal Metabolic Rate) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, and cell production while completely at rest. It typically accounts for 60-70% of your total daily calorie burn.
How to Use
- Enter your age, gender, weight, and height
- The calculator uses the Mifflin-St Jeor equation for the most accurate estimate
- View your BMR in calories per day
- Use this as the baseline to calculate your TDEE with an activity multiplier
Formula
Mifflin-St Jeor: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age) + s (s = +5 for males, -161 for females)
Frequently Asked Questions
- What is the difference between BMR and RMR?
- BMR (Basal Metabolic Rate) is measured under strict resting conditions. RMR (Resting Metabolic Rate) is measured under less strict conditions and is typically 10-20% higher. RMR is more practical to test.
- Why does BMR decrease with age?
- Aging naturally reduces muscle mass (sarcopenia) and slows metabolic processes. This is why maintaining muscle through resistance training is important as you age.
- Can I increase my BMR?
- Yes, building muscle mass is the most effective way since muscle tissue burns more calories at rest than fat tissue. Regular strength training can meaningfully raise your BMR.