What is Basal Metabolic Rate (BMR)?
Basal Metabolic Rate, abbreviated as BMR, represents the number of calories your body burns at complete rest to maintain vital functions such as breathing, blood circulation, organ function and body temperature. In other words: your BMR is the minimum amount of energy your body needs to stay alive.
Your BMR accounts for roughly 60–75% of your total daily calorie expenditure and is one of the most important numbers when it comes to weight loss, muscle gain and long-term health. Fitness coaches, dietitians and health professionals use BMR calculations worldwide to estimate calorie requirements and create personalised nutrition plans.
Formula
The BMR Calculator uses the scientifically validated Mifflin-St Jeor Formula. Example for men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5. Example for women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161.
How do you interpret your BMR result?
Your BMR shows how many calories your body burns per day at complete rest. The higher your BMR, the more energy your body naturally consumes. Your result depends on factors such as age, gender, height, weight and muscle mass.
| Factor | Effect on BMR | Explanation | Impact |
|---|---|---|---|
| Muscle mass | Higher BMR | Muscle tissue burns more calories than fat tissue | Helps with fat loss and weight maintenance |
| Age | Lower BMR | Metabolism slows down gradually with age | Easier weight gain over time |
| Gender | Men usually higher | Men generally carry more muscle mass | Higher daily calorie needs |
| Height & weight | Higher body size = higher BMR | Larger bodies require more energy | More calories burned at rest |
| Dieting | Can lower BMR | Extreme calorie restriction slows metabolism | Harder long-term fat loss |
What do you do with your BMR result?
What does this mean for you?
Your BMR is the foundation for calculating your Total Daily Energy Expenditure (TDEE). Once you know your BMR, you can estimate how many calories you need to lose fat, maintain weight or build muscle.
A lower BMR means your body burns fewer calories at rest. This is common in smaller individuals, older adults or people with lower muscle mass.
A higher BMR means your body naturally burns more calories throughout the day. This is often seen in taller individuals and people with more lean muscle mass.
If your goal is weight loss
Create a moderate calorie deficit of 300–500 calories below your TDEE while maintaining high protein intake and regular exercise. Sustainable fat loss works best when you avoid crash diets that slow down metabolism. TDEE · Calorie Deficit Calculator
If your goal is muscle gain
Eat slightly above maintenance calories and combine this with strength training. Muscle growth increases your BMR over time because muscle tissue burns more energy even at rest.
Tip
Increasing muscle mass is one of the most effective ways to naturally boost your metabolism and burn more calories throughout the day.
If your metabolism feels slow
Focus on strength training, sufficient protein intake, quality sleep and avoiding extreme calorie restriction. Long-term crash dieting can significantly reduce metabolic rate.