BMR Calculator
The Baseline of Your Metabolism
BMR & Calorie Calculator
Find your daily calorie needs based on your activity level
This tool provides a general estimate based on standard formulas and is not a substitute for professional medical advice.
What is BMR Calculator?
Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions — such as breathing, blood circulation, cell production, and temperature regulation — while at complete rest.
BMR accounts for 60–75% of your total daily energy expenditure. Understanding your BMR is the foundation of effective weight management, whether you want to lose, gain, or maintain weight.
Why does this matter?
Without knowing your BMR, any diet plan is guesswork. If you eat fewer calories than your BMR long-term, your body enters starvation mode and starts burning muscle. If you eat significantly more, you gain fat. BMR is your metabolic baseline.
How to Use This Tool
- Enter your height (cm), weight (kg), and age (years) accurately.
- Select your biological gender — hormonal differences create significant BMR variations.
- Click "Calculate BMR" to get your daily calorie burn at rest.
- Use this number as input for the Daily Calorie Calculator to find your total energy needs.
Tips for Accurate Results
- BMR decreases with age — roughly 2% per decade after age 20.
- Muscle tissue burns more calories than fat tissue. Resistance training can raise your BMR.
- Severe calorie restriction (crash diets) lowers your BMR as the body adapts.
- Thyroid conditions significantly affect BMR. If your result seems very off, consult a doctor.
Frequently Asked Questions
What formula does this calculator use?
We use the Mifflin–St Jeor equation (1990), which is considered the most accurate for most adults: Males: (10 × weight) + (6.25 × height) − (5 × age) + 5. Females: (10 × weight) + (6.25 × height) − (5 × age) − 161.
What is the difference between BMR and TDEE?
BMR is your calorie burn at complete rest. TDEE (Total Daily Energy Expenditure) is BMR multiplied by an activity factor. TDEE reflects your actual daily calorie needs including exercise and movement.
Can I eat below my BMR to lose weight?
Eating significantly below your BMR is not recommended. It leads to muscle loss, nutritional deficiencies, and a slowdown of metabolism. A safe deficit is 300–500 kcal below your TDEE, not below your BMR.
Why do men have a higher BMR than women?
On average, men have more lean muscle mass and less body fat than women of the same weight. Muscle tissue is metabolically more active, leading to a higher resting calorie burn.
Does my BMR change if I lose weight?
Yes. As you lose weight, your BMR decreases because your body mass decreases. Recalculate your BMR every 5–10 kg of weight change to keep your calorie targets accurate.
- Medical Disclaimer: This tool is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making health decisions.
How to Use This Tool
- Below 1,200 kcal/day — Very Low — May indicate low muscle mass or health issues
- 1,200 – 1,500 kcal/day — Low-Normal (common for smaller women)
- 1,500 – 1,800 kcal/day — Normal Range (average adult)
- 1,800 – 2,200 kcal/day — Above Average (tall/muscular individuals)
- Above 2,200 kcal/day — High BMR (athletes with significant muscle mass)
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