BMR Calculator Client-Side & Private
Calculate your Basal Metabolic Rate (BMR)—the minimum energy expenditure your organs require to sustain life at rest. Discover your daily caloric maintenance across 6 activity tiers using clinical equations.
years (15 - 80+)
feet
inches
pounds
Metabolic Rate Results
Basal Metabolic Rate
1,689 Calories/day
Daily calorie needs based on activity level
| Activity Level | Calorie |
|---|---|
| Sedentary: little or no exercise | 2,027 |
| Exercise 1-3 times/week | 2,322 |
| Exercise 4-5 times/week | 2,474 |
| Daily exercise or intense exercise 3-4 times/week | 2,618 |
| Intense exercise 6-7 times/week | 2,914 |
| Very intense exercise daily, or physical job | 3,209 |
Exercise Definitions:
• Sedentary: Desk work, sitting most of the day, minimal movement.
• Light Activity: Casual walking, light chores, or 1–3 gym workouts weekly.
• Moderate Activity: Moderate gym workouts, cycling, or jogging 4–5 times a week.
• Active: Daily vigorous exercise or high-intensity training 3–4 times weekly.
• Very Active: Heavy training 6–7 days/week or full-time physical labor (construction, athletics).
• Sedentary: Desk work, sitting most of the day, minimal movement.
• Light Activity: Casual walking, light chores, or 1–3 gym workouts weekly.
• Moderate Activity: Moderate gym workouts, cycling, or jogging 4–5 times a week.
• Active: Daily vigorous exercise or high-intensity training 3–4 times weekly.
• Very Active: Heavy training 6–7 days/week or full-time physical labor (construction, athletics).
Caloric Targets for Common Goals
Mild Weight Loss
2,224 kcal
-0.5 lb / 0.25 kg per week (-250 kcal/day)
Moderate Weight Loss
1,974 kcal
-1.0 lb / 0.5 kg per week (-500 kcal/day)
Fast Weight Loss
1,474 kcal
-2.0 lb / 1.0 kg per week (-1000 kcal/day)
Lean Muscle Gain
2,774 kcal
+300 kcal lean bulk surplus
⚡ Time Required to Burn 500 Calories
Running (6 mph)
~43 min
Cycling (Vigorous)
~56 min
Swimming Laps
~60 min
Weight Training
~85 min
Brisk Walking
~120 min
What is Basal Metabolic Rate (BMR)?
Your Basal Metabolic Rate (BMR) is the baseline quantity of energy—measured in kilocalories (kcal) per day—required to keep your body functioning at complete rest in a neutral environment. Even when you are sleeping or resting motionless, your body expends approximately 60% to 75% of its total daily energy on autonomous life-sustaining processes, such as:
- Cellular respiration, protein synthesis, and electrolyte balance
- Heart pumping and continuous blood circulation
- Lung function and gas exchange
- Brain activity and central nervous system signaling
- Liver, renal, and hormonal metabolism
- Core body temperature regulation (thermoregulation)
BMR vs. RMR vs. TDEE: What's the Difference?
While these three fitness terms are frequently used interchangeably, they represent distinct physiological measurements:
- BMR (Basal Metabolic Rate): Strictly measured under strict clinical laboratory settings immediately after 8 hours of sleep and a 12-hour fast, with zero motor activity.
- RMR (Resting Metabolic Rate): A slightly looser clinical or estimated measure that factors in low-stress daytime resting states. RMR is typically within 5% to 10% of BMR.
- TDEE (Total Daily Energy Expenditure): Your true daily calorie burn, combining your BMR + the Thermic Effect of Food (TEF, ~10%) + Non-Exercise Activity Thermogenesis (NEAT) + Exercise Activity Thermogenesis (EAT).
Understanding the Calculation Formulas
1. Mifflin-St Jeor Equation (Default):
• Male: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5
• Female: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161
Note: Developed in 1990, the Mifflin-St Jeor formula is widely acknowledged by clinical dietitians and the American Dietetic Association as the most accurate estimation tool for individuals with standard body composition.
• Male: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5
• Female: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161
Note: Developed in 1990, the Mifflin-St Jeor formula is widely acknowledged by clinical dietitians and the American Dietetic Association as the most accurate estimation tool for individuals with standard body composition.
2. Revised Harris-Benedict Equation:
• Male: BMR = 13.397W + 4.799H - 5.677A + 88.362
• Female: BMR = 9.247W + 3.098H - 4.330A + 447.593
Note: Originally established in 1919 and revised by Roza and Shizgal in 1984, this equation is classic and widely referenced in historical physiology literature.
• Male: BMR = 13.397W + 4.799H - 5.677A + 88.362
• Female: BMR = 9.247W + 3.098H - 4.330A + 447.593
Note: Originally established in 1919 and revised by Roza and Shizgal in 1984, this equation is classic and widely referenced in historical physiology literature.
3. Katch-McArdle Formula (Lean Mass Based):
• BMR = 370 + (21.6 × Lean Body Mass in kg)
• Where Lean Body Mass = Weight × (1 - Body Fat Percentage / 100)
Note: Unlike Mifflin or Harris-Benedict, Katch-McArdle directly isolates lean muscle mass from adipose fat tissue. It is especially recommended for lean athletes, bodybuilders, and fitness enthusiasts with verified body composition data.
• BMR = 370 + (21.6 × Lean Body Mass in kg)
• Where Lean Body Mass = Weight × (1 - Body Fat Percentage / 100)
Note: Unlike Mifflin or Harris-Benedict, Katch-McArdle directly isolates lean muscle mass from adipose fat tissue. It is especially recommended for lean athletes, bodybuilders, and fitness enthusiasts with verified body composition data.
Frequently Asked Questions
Can I safely consume fewer calories than my BMR?
For sustainable weight loss, it is generally recommended not to drop substantially below your BMR for extended periods without medical supervision. Consuming fewer calories than your body needs for basic organ function can trigger hormonal slowdowns, muscle catabolism, lethargy, and reduced thyroid function. Aim instead for a moderate caloric deficit derived from your TDEE (maintenance) rather than your BMR.
For sustainable weight loss, it is generally recommended not to drop substantially below your BMR for extended periods without medical supervision. Consuming fewer calories than your body needs for basic organ function can trigger hormonal slowdowns, muscle catabolism, lethargy, and reduced thyroid function. Aim instead for a moderate caloric deficit derived from your TDEE (maintenance) rather than your BMR.
How can I increase my BMR?
The single most effective way to boost your baseline resting metabolic rate is by increasing skeletal muscle mass through progressive resistance training (weight lifting) and adequate protein intake. Skeletal muscle is metabolically active tissue that consumes significantly more calories at rest than fat tissue.
The single most effective way to boost your baseline resting metabolic rate is by increasing skeletal muscle mass through progressive resistance training (weight lifting) and adequate protein intake. Skeletal muscle is metabolically active tissue that consumes significantly more calories at rest than fat tissue.
Is my data private?
Yes. 100% of the mathematical calculations on this page are executed in your browser via local JavaScript. None of your body metrics, ages, heights, or weights are logged, tracked, or transmitted to any server.
Yes. 100% of the mathematical calculations on this page are executed in your browser via local JavaScript. None of your body metrics, ages, heights, or weights are logged, tracked, or transmitted to any server.