BMR Calculator
Calculate your Basal Metabolic Rate (BMR) - the exact calories burned at complete rest.
Input Parameters
Live Result
Details
Quick Answer & Understanding Your Result
Your Basal Metabolic Rate (BMR) represents the minimum calories your body burns at complete rest to maintain vital functions like breathing, heart pumping, cell repair, and brain activity.
Clinical BMR Formulas
- Mifflin-St Jeor Equation (Most Accurate):
- Men: 10 × weight (kg) + 6.25 × height (cm) - 5 × age + 5
- Women: 10 × weight (kg) + 6.25 × height (cm) - 5 × age - 161
- Katch-McArdle Formula (Body Fat Specific): BMR = 370 + 21.6 × Lean Body Mass (kg)
- Revised Harris-Benedict: Legacy clinical standard with slight overestimation in modern populations.
Key Factors Governing Your BMR
- Lean Muscle Mass: Muscle tissue burns approximately 3 × more calories at rest than adipose fat tissue.
- Age & Biological Sex: BMR naturally declines by 1 - 2% per decade after age 30 due to gradual muscle loss.
- Thyroid & Hormonal Activity: Thyroid hormones (T_3, T_4) directly regulate resting metabolic velocity.
Enter your age, gender, height, and weight above to compute your precise resting caloric baseline.
Formula & Calculation Logic
Mathematical FormulaWhere W is weight in kg, H is height in cm, A is age in years, and LBM is lean body mass in kg.
Step-by-Step Guide
Select Biological Sex
Choose Male or Female (metabolic equations differ by gender).
Enter Age, Height, and Weight
Input your exact current physical measurements.
Optional: Enter Body Fat %
Provide body fat percentage to calculate via Katch-McArdle.
Review BMR and Resting Burn
View your daily resting energy expenditure in calories (kcal/day).
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| 30-Year-Old Male (175cm, 70kg) | (10×70) + (6.25×175) - (5×30) + 5 = 1,648.75 kcal. | ||
| 25-Year-Old Female (160cm, 52kg) | (10×52) + (6.25×160) - (5×25) - 161 = 1,234 kcal. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
American Journal of Clinical Nutrition - Mifflin-St Jeor Study
Academy of Nutrition and Dietetics - Evidence Analysis Library
Standard: WHO Adult BMI Diagnostic Standard
Formula: Men: BMR = (10 × W) + (6.25 × H) - (5 × A) + 5
Last Reviewed: August 21, 2026
Primary Source: American Journal of Clinical Nutrition - Mifflin-St Jeor Study
Reference Document: Academy of Nutrition and Dietetics - Evidence Analysis Library
Computation Privacy: 100% client-side 0ms computation, zero data retention
Calculated health, metabolic, and biometric metrics are for general fitness and educational reference only. They do not substitute for professional medical advice, clinical diagnosis, or personalized treatment plans.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.