BMR stands for Basal Metabolic Rate. It is the number of calories your body burns at complete rest just to keep your vital organs functioning — your heart beating, lungs breathing and brain working.

A typical BMR for women ranges from around 1,200 to 1,600 calories per day. For men it typically ranges from 1,500 to 2,000 calories per day. Higher BMR generally means a faster metabolism.

How can I increase my BMR?

The most effective way to increase BMR is to build muscle mass through resistance training. Muscle tissue burns more calories at rest than fat tissue. Eating enough protein also helps preserve muscle mass.

What is BMR? Basal Metabolic Rate Explained

Q: What is the difference between BMR and TDEE?

BMR is the calories burned at rest. TDEE (Total Daily Energy Expenditure) is your BMR multiplied by your activity level, giving your total daily calorie burn including all movement and exercise. TDEE is always higher than BMR.

Q: Should I eat at my BMR?

No. You should never eat at your BMR unless medically supervised. BMR does not account for any daily movement or activity. Eating at BMR level is far too low for most people and can cause muscle loss and nutritional deficiencies.

What Does BMR Stand For?

BMR stands for Basal Metabolic Rate. It is the number of calories your body burns each day at complete rest — doing absolutely nothing except keeping you alive. This includes your heart beating, your lungs breathing, your brain functioning, your kidneys filtering, and all other essential biological processes.

Think of your BMR as the energy your body needs just to exist. Even if you stayed in bed all day without moving, your body would still burn this many calories to sustain itself.

💡 Simple definition: BMR is the minimum number of calories your body needs to survive at complete rest. It is the foundation of all calorie calculations and the starting point for finding your TDEE.

What is the Difference Between BMR and TDEE?

😴 BMR — Basal Metabolic Rate

Calories burned at complete rest. Does not include any movement, exercise or daily activity. This is your body's "idle" calorie burn.

🏃 TDEE — Total Daily Energy Expenditure

BMR multiplied by your activity level. Includes all movement, exercise and daily activity. This is your actual total daily calorie burn.

Your TDEE is always higher than your BMR. For a sedentary person, TDEE might be 20% higher than BMR. For a very active person or athlete, TDEE could be 80–90% higher than BMR.

Calculate Your BMR and TDEE Free

Our calculator gives you both your BMR and TDEE instantly — along with your calorie targets for any goal.

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How is BMR Calculated?

The most widely used and scientifically validated formula for calculating BMR is the Mifflin-St Jeor equation, developed in 1990. It is considered more accurate than the older Harris-Benedict formula for most people.

Mifflin-St Jeor BMR Formula

Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5

Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161

Example (woman, 30 years, 65kg, 165cm):
BMR = (10 × 65) + (6.25 × 165) − (5 × 30) − 161
BMR = 650 + 1031 − 150 − 161 = 1,370 calories/day

If you know your body fat percentage, a more accurate formula called Katch-McArdle can be used. This formula is based on lean body mass rather than total weight, making it more accurate for muscular or very lean individuals.

Katch-McArdle BMR Formula (when body fat % is known)

Lean Body Mass = weight kg × (1 − body fat %)

BMR = 370 + (21.6 × Lean Body Mass)

What is a Normal BMR?

BMR varies significantly based on body size, age, sex and muscle mass. Here are typical BMR ranges for adults:

Group	Typical BMR Range
Average adult woman	1,200 – 1,600 calories/day
Average adult man	1,500 – 2,000 calories/day
Very muscular woman	1,500 – 1,900 calories/day
Very muscular man	1,900 – 2,400 calories/day
Older adult (65+)	1,100 – 1,600 calories/day

Should I Eat at My BMR?

⚠️ No — never eat at your BMR. Your BMR does not account for any daily activity or movement. Eating at BMR level is far too low for the vast majority of people and can lead to muscle loss, nutrient deficiencies, fatigue and metabolic slowdown. Always use your TDEE as your baseline.

What Factors Affect BMR?

Muscle mass

This is the biggest controllable factor. Muscle tissue burns significantly more calories at rest than fat tissue. Building muscle through resistance training is the most effective long-term strategy for increasing your BMR.

Age

BMR naturally declines with age — approximately 1–2% per decade after age 20. This is largely due to the gradual loss of muscle mass that occurs with ageing, a process called sarcopenia. Regular resistance training can significantly slow this decline.

Sex

Men typically have a higher BMR than women of the same age and weight, primarily because men tend to have greater muscle mass and less body fat. Hormonal differences also play a role.

Body size

Larger bodies — both in height and weight — require more energy to maintain. A taller, heavier person will generally have a higher BMR than a shorter, lighter person of the same age and sex.

Hormones and health conditions

Thyroid hormones play a particularly important role in regulating metabolism. An underactive thyroid (hypothyroidism) can significantly reduce BMR, while an overactive thyroid (hyperthyroidism) can increase it.

How to Increase Your BMR

Build muscle: Resistance training increases muscle mass, which raises resting calorie burn permanently
Eat enough protein: Protein has a high thermic effect and helps preserve muscle mass during weight loss
Don't under-eat severely: Very low calorie diets cause metabolic adaptation, lowering BMR over time
Stay active: Regular exercise preserves muscle and keeps metabolism higher as you age
Get enough sleep: Poor sleep disrupts hormones that regulate metabolism and hunger

💪 Key insight: The most reliable way to raise your BMR long term is to build and maintain muscle mass. Every kilogram of muscle you add burns approximately 13 extra calories per day at rest — which adds up significantly over time.