BMR Calculator
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). Supports Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas.
Body parameters
Calculated Energy Outputs
Recommended Target Calorie Ranges
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How to Use BMR Calculator
BMR Calculator Formula / How It Works
This calculator runs selected BMR formulas using weight, height, and age parameters. If body fat % is present in Katch mode, it derives LBM and uses it as the sole metabolic multiplier. TDEE is computed by applying activity multipliers (1.2 to 1.9).
For example, a 25-year-old male weighing 70kg at 175cm height has a BMR of approximately 1,630 kcal/day under Mifflin-St Jeor.
Frequently Asked Questions
BMR is the amount of energy (in calories) your body needs to survive at complete rest, maintaining life-sustaining functions such as breathing, circulation, cell production, and temperature regulation.
BMR represents your resting calorie expenditure. TDEE (Total Daily Energy Expenditure) is your total daily calorie burn after factoring in your activity level multiplier (sedentary, lightly active, moderate, etc.).
Katch-McArdle is the most accurate formula when you know your body fat percentage. It bases calorie expenditure on Lean Body Mass (LBM) rather than total body weight, making it highly accurate for athletic or muscular individuals.
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