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Online BMR Calculator
Calculate your Basal Metabolic Rate (BMR) quickly and accurately using the Mifflin-St Jeor formula. Ideal for nutrition planning and managing energy expenditure.
BASAL METABOLIC RATE (calories per day)
1,793
| ACTIVITY LEVEL | TIME | FREQUENCY | CALORIES |
|---|---|---|---|
|
No Activity |
0 minutes | Little or no exercise | 2,151 |
|
Low Activity |
15-30 minutes | 1-3 times per week | 2,465 |
|
Light Activity |
15-30 minutes | 4-5 times per week | 2,626 |
|
Medium Activity |
15-30 minutes | 3-4 times per week | 2,778 |
|
High Activity |
45-120 minutes | 6-7 times per week | 3,092 |
|
Very High Activity |
2+ hours | Daily | 3,406 |
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What Is This Tool?
This calculator estimates your Basal Metabolic Rate (BMR), which is the number of calories your body burns at rest each day. It uses the scientifically recognized Mifflin-St Jeor formula to provide precise results based on your weight, height, age, and sex.
How to Use This Tool?
- Enter your weight in kilograms (kg)
- Input your height in centimeters (cm)
- Specify your age in years
- Select your biological sex (male or female)
- Click the calculate button to receive your BMR result
Key Features
- Calculates BMR using the modern Mifflin-St Jeor equation
- Supports input for weight (kg), height (cm), age (years), and sex
- Provides fast and reliable calorie burn estimation at rest
- Useful for nutrition planning and dieting purposes
- Browser-based and easy to use with no installation required
Examples
- For a 30-year-old male weighing 75 kg and 180 cm tall, the BMR is calculated as: 10×75 + 6.25×180 − 5×30 + 5 = 1730 kcal per day
Common Use Cases
- Estimating daily calorie needs for weight management
- Supporting nutrition and diet planning
- Assessing baseline energy expenditure for health monitoring
Tips & Best Practices
- Ensure accurate measurements of weight and height for best results
- Use your current age for precise calculation
- Understand that BMR is an estimate and factors like muscle mass are not included
- Utilize the BMR value as a foundation to set dietary and fitness goals
Limitations
- Does not account for differences in muscle mass
- Hormonal variations are not considered in the calculation
- Provides an estimation of calorie burn at rest only
Frequently Asked Questions
- What is BMR?
- BMR stands for Basal Metabolic Rate, representing the amount of energy your body requires to maintain vital functions while at rest.
- Why does the formula differ for males and females?
- The Mifflin-St Jeor formula uses different constants to reflect biological differences affecting metabolism between males and females.
- Can this calculator be used for all ages?
- Yes, as long as you input your current age in years, the tool can provide an accurate BMR estimate.
Key Terminology
- BMR
- Basal Metabolic Rate—the number of calories your body burns at rest each day.
- Mifflin-St Jeor Formula
- A modern equation used to calculate BMR using weight, height, age, and sex.
- Calories
- Units of energy used to quantify the amount of energy the body uses or stores.