MyFitnessPal BMR Calculator
Calculate your Basal Metabolic Rate using the MyFitnessPal preferred Mifflin-St Jeor formula.
Select your biological sex.
Please enter a valid weight.
Your current weight in kilograms.
Please enter a valid height.
Your height in centimeters.
Age must be between 1 and 120.
Your current age.
Used to calculate Total Daily Energy Expenditure (TDEE).
This is the energy burned if you did nothing but rest for 24 hours.
TDEE (Daily Needs)
Weight Loss (-500 cal)
Muscle Gain (+500 cal)
Calorie Burn Breakdown
Comparison of BMR vs Daily Activity Needs vs High Intensity Needs.
| Activity Level | Multiplier | Estimated Daily Calories |
|---|
What is a MyFitnessPal BMR Calculator?
The myfitnesspal bmr calculator is a digital tool designed to estimate your Basal Metabolic Rate, which represents the number of calories your body needs to maintain basic physiological functions while at complete rest. These functions include breathing, circulating blood, nutrient processing, and cell production. Understanding your BMR is the fundamental first step in any fitness journey, whether you are using the MyFitnessPal app or tracking manually.
Many people confuse BMR with TDEE. While the myfitnesspal bmr calculator tells you what your organs need to survive, your Total Daily Energy Expenditure (TDEE) accounts for your physical activity. By using the Mifflin-St Jeor equation—the scientific gold standard used by modern health apps—this calculator provides a highly accurate starting point for your nutrition goals.
Common Misconceptions
- “BMR is my total calorie limit”: False. Eating below your BMR for extended periods can be dangerous as your body lacks energy for basic organ function.
- “BMR never changes”: False. As you lose weight or gain muscle, your myfitnesspal bmr calculator results will shift.
- “Exercise increases BMR instantly”: While muscle mass increases BMR over time, the act of exercise itself contributes to TDEE, not the baseline metabolic rate.
MyFitnessPal BMR Calculator Formula and Mathematical Explanation
This calculator utilizes the Mifflin-St Jeor Equation, which research has shown to be more accurate than the older Harris-Benedict formula. The calculation involves four primary variables: weight, height, age, and biological sex.
The Equations:
- Men: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) + 5
- Women: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) – 161
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Weight | Total Body Mass | Kilograms (kg) | 45 – 200 kg |
| Height | Vertical Stature | Centimeters (cm) | 140 – 210 cm |
| Age | Chronological Age | Years | 18 – 85 years |
| Gender | Biological Sex | Binary (M/F) | N/A |
Practical Examples (Real-World Use Cases)
Example 1: Male Office Worker
Consider a 35-year-old male, 180 cm tall, weighing 90 kg. Using the myfitnesspal bmr calculator:
BMR = (10 × 90) + (6.25 × 180) – (5 × 35) + 5 = 1855 calories.
If he is sedentary (1.2 multiplier), his TDEE is 2,226 calories. To lose weight, he might target 1,726 calories daily.
Example 2: Female Athlete
A 28-year-old female, 165 cm tall, weighing 60 kg. Using the myfitnesspal bmr calculator:
BMR = (10 × 60) + (6.25 × 165) – (5 × 28) – 161 = 1,330 calories.
Being “Very Active” (1.725 multiplier), her daily needs are 2,294 calories to maintain her current physique.
How to Use This MyFitnessPal BMR Calculator
Following these steps will ensure you get the most out of your myfitnesspal bmr calculator results:
- Enter Gender: Biological sex affects hormonal profiles and muscle-to-fat ratios.
- Input Weight: Use a recent measurement. If you know your body fat percentage, note that higher muscle mass increases your real BMR.
- Input Height and Age: Be precise to ensure the math reflects your current stature.
- Select Activity Level: Be honest! Most people overestimate their activity. If you work at a desk and walk 20 minutes a day, “Sedentary” or “Lightly Active” is usually best.
- Analyze Results: Use the BMR as your “floor” and the TDEE as your “ceiling.”
Key Factors That Affect MyFitnessPal BMR Results
- Lean Muscle Mass: Muscle is metabolically active. The more muscle you have, the higher your myfitnesspal bmr calculator output will be.
- Age: Metabolic rate naturally declines with age as lean muscle tissue decreases and hormonal changes occur.
- Genetics: Some individuals naturally possess a faster or slower metabolism due to inherited traits.
- Hormones: Thyroid issues (hypothyroidism or hyperthyroidism) can significantly shift your BMR regardless of height or weight.
- Environmental Temperature: Extreme cold or heat forces the body to work harder to maintain internal temperature, slightly raising BMR.
- Caloric Restriction: Long-term “crash dieting” can cause the body to lower its BMR to conserve energy, a process known as adaptive thermogenesis.
Frequently Asked Questions (FAQ)
It is generally discouraged to consistently eat below your myfitnesspal bmr calculator result without medical supervision, as it can lead to nutrient deficiencies and metabolic slowdown.
Recalculate every time you lose or gain 5-10 pounds. Your energy needs change as your body mass changes.
Yes, MyFitnessPal primarily uses the Mifflin-St Jeor equation to provide its users with calorie goals.
Men typically have a higher percentage of lean muscle mass and lower body fat than women of the same weight, leading to a higher BMR.
No, the myfitnesspal bmr calculator formula is designed for adults. Children have different metabolic requirements due to growth.
Stimulants can provide a temporary thermogenic boost, but they do not fundamentally change your resting BMR in the long term.
BMR is measured under strict laboratory conditions (after 12 hours of fasting). Resting Metabolic Rate (RMR) is slightly less restrictive and usually 5-10% higher than BMR.
The most effective way to permanently increase your myfitnesspal bmr calculator baseline is through resistance training to build lean muscle mass.
Related Tools and Internal Resources
- TDEE Calculator: Find your total daily energy expenditure including all activity.
- Macro Calculator: Breakdown your calories into protein, carbs, and fats.
- BMI Calculator: Determine if your weight is in a healthy range for your height.
- Weight Loss Planner: Create a timeline for your fitness goals.
- Calorie Deficit Guide: Learn the science of losing weight safely.
- Body Fat Calculator: Estimate your body composition for more precise calorie planning.