🔥 BMR Calculator
Basal Metabolic Rate + TDEE
TDEE includes daily activity.
BMR Calculator: Calculate Your Basal Metabolic Rate & Daily Calorie Needs
Understanding how many calories your body needs each day is the first step toward achieving any fitness goal. Whether you want to lose weight, maintain your current body composition, or build muscle, knowing your Basal Metabolic Rate (BMR) provides a reliable starting point.
Our BMR Calculator estimates the number of calories your body burns while completely at rest using the scientifically validated Mifflin-St Jeor Equation, the most widely recommended formula for healthy adults. It then calculates your Total Daily Energy Expenditure (TDEE) based on your activity level, giving you personalized calorie targets for weight loss, maintenance, or muscle gain.
What Is BMR?
Basal Metabolic Rate (BMR) is the minimum number of calories your body needs to perform essential life-sustaining functions while at complete rest.
These functions include:
- Breathing
- Blood circulation
- Heart function
- Brain activity
- Cell repair and growth
- Hormone production
- Maintaining body temperature
BMR does not include calories burned through walking, working, exercising, or any other physical activity.
For most adults, BMR accounts for approximately 60–75% of total daily calorie expenditure, making it one of the biggest factors affecting your daily energy needs.
How Our BMR Calculator Works
Our calculator estimates your BMR using the Mifflin-St Jeor Equation, which is considered one of the most accurate methods for estimating resting calorie requirements in healthy adults.
To generate your result, simply enter:
- Age
- Gender
- Height
- Weight
- Activity level
The calculator first estimates your Basal Metabolic Rate (BMR) and then multiplies it by an activity factor to calculate your Total Daily Energy Expenditure (TDEE).
This gives you a realistic estimate of how many calories you burn each day based on your lifestyle.
BMR Formula (Mifflin-St Jeor Equation)
For Men
BMR = (10 × Weight in kg) + (6.25 × Height in cm) − (5 × Age) + 5
For Women
BMR = (10 × Weight in kg) + (6.25 × Height in cm) − (5 × Age) − 161
This formula has become the preferred choice among nutrition professionals because it generally provides more accurate estimates than many older equations.
What Is TDEE?
Your Total Daily Energy Expenditure (TDEE) represents the total number of calories your body burns throughout an entire day.
Unlike BMR, TDEE includes:
- Everyday movement
- Walking
- Exercise
- Household activities
- Work-related movement
- Digestion of food
Your calculator result multiplies your BMR by an activity multiplier to estimate your maintenance calories.
Typical activity multipliers include:
| Activity Level | Multiplier |
| Sedentary | 1.20 |
| Lightly Active | 1.375 |
| Moderately Active | 1.55 |
| Very Active | 1.725 |
| Extra Active | 1.90 |
Your TDEE is the number most people should use when planning daily calorie intake.
Why Use a BMR Calculator?
Instead of guessing your calorie needs, a BMR calculator provides a personalized estimate based on your body measurements.
It can help you:
- Plan a weight loss diet
- Calculate maintenance calories
- Build muscle more efficiently
- Avoid overeating or undereating
- Track calorie needs as your weight changes
- Create realistic nutrition goals
Whether you're a beginner or an experienced athlete, understanding your calorie requirements makes nutrition planning much easier.
Features of Our BMR Calculator
Scientifically Accurate Formula
Uses the trusted Mifflin-St Jeor Equation, one of the most reliable methods available for estimating resting metabolic rate.
Metric & Imperial Units
Switch effortlessly between:
- Kilograms and centimeters
- Pounds and feet/inches
Automatic conversion eliminates manual calculations.
Personalized Activity Levels
Choose from multiple activity levels so your calorie estimate better reflects your lifestyle.
Goal-Based Calorie Recommendations
Receive personalized calorie targets for:
- Weight loss
- Weight maintenance
- Lean muscle gain
These recommendations make meal planning much simpler.
Instant Results
No registration, downloads, or complicated setup.
Simply enter your information and receive your results immediately.
Mobile-Friendly Design
Works smoothly across desktops, tablets, and smartphones for quick access anywhere.
How to Use Your BMR Results
Once you know your daily calorie needs, you can adjust your intake according to your goal.
For Weight Loss
Aim to consume around 15–25% fewer calories than your TDEE.
A moderate calorie deficit usually produces sustainable fat loss while helping preserve muscle.
For Weight Maintenance
Eat approximately the same number of calories as your TDEE.
This helps maintain your current body weight.
For Muscle Gain
Consume roughly 10–20% more calories than your maintenance level while following a progressive strength-training program.
Factors That Affect BMR
Your metabolic rate is influenced by several factors, including:
- Age
- Gender
- Height
- Body weight
- Muscle mass
- Genetics
- Hormonal health
- Overall health condition
People with more lean muscle generally burn more calories at rest than those with less muscle mass.
Frequently Asked Questions
Is BMR the same as TDEE?
No.
BMR measures calories burned while your body is completely at rest.
TDEE includes all daily activities and represents your total daily calorie expenditure.
Which formula is the most accurate?
For most healthy adults, the Mifflin-St Jeor Equation is considered one of the most accurate formulas available and is widely used by dietitians and fitness professionals.
Should I eat only my BMR calories?
Generally, no.
Most people should base their daily calorie intake on their TDEE, not their BMR, because TDEE includes daily movement and exercise.
How often should I calculate my BMR?
Recalculate every 4–8 weeks, or whenever your:
- Weight changes significantly
- Activity level changes
- Fitness goals change
Updating your calorie targets helps keep your nutrition plan accurate.
Can I use this calculator for muscle gain?
Yes.
Your BMR and TDEE provide an excellent starting point for determining how many calories you need to support lean muscle growth.
Does age affect metabolism?
Yes.
Metabolism generally slows with age due to changes in muscle mass, hormones, and activity levels.
Final Thoughts
Knowing your calorie needs doesn't have to be complicated. A reliable BMR Calculator gives you a personalized estimate of the calories your body burns at rest and combines it with your activity level to calculate your daily energy requirements.
Whether your goal is to lose fat, maintain your weight, or build muscle, understanding your BMR and TDEE helps you make smarter nutrition decisions instead of relying on guesswork.
Use our free BMR Calculator today to discover your maintenance calories and build a nutrition plan that's tailored to your body and your goals.