Basal Metabolic Rate Calculator
Calculate daily basal metabolic rate instantly from sex, age, height, and weight
Features
Instant calculation with 4 inputs
Daily basal metabolic rate is displayed as soon as you enter sex, age, height, and weight
Results with calculation formula shown
The value calculated using the Harris-Benedict equation (revised version) and the formula are displayed below the result
Switch height and weight units
Choose between cm and ft/in for height, and kg and lb for weight
No data transmission or storage
Body measurements are calculated only within your browser and cleared when you leave the page
How to Use
Select your sex
Choose either male or female
Enter age, height, and weight
Enter your age (18–120 years), height, and weight. If needed, use the unit switcher to the right of the input field to change units
Check your basal metabolic rate
View your daily basal metabolic rate (kcal/day) displayed as you enter your data
Use Cases
Planning calorie intake for dieting
Know your basal metabolic rate before setting a target calorie intake
Meal management for strength training and bulking
Use the base energy expenditure value as a reference for meal planning
Comparing changes with weight or age
See how your basal metabolic rate changes when your weight changes or on your birthday
Checking body measurements in foreign units
Input height and weight recorded in ft/in or lb without needing to convert
Knowledge
What is basal metabolic rate?
Basal metabolic rate is the amount of energy your body consumes at rest to maintain life functions such as body temperature, breathing, and heartbeat. It is expressed in kilocalories per day (kcal/day) and varies by sex, age, and body composition.
- Difference from daily energy expenditure：Daily energy expenditure is the basal metabolic rate plus energy consumed from physical activity and digestion. It is higher than basal metabolic rate for people with higher activity levels.
Harris-Benedict equation (revised version) calculation formula
The Harris-Benedict equation (revised version) is a basal metabolic rate estimation formula revised in 1984. It is calculated by multiplying weight (kg), height (cm), and age by sex-specific coefficients.
- Formula for males：Male basal metabolic rate is calculated as: 88.362 + 13.397 × weight + 4.799 × height − 5.677 × age
- Formula for females：Female basal metabolic rate is calculated as: 447.593 + 9.247 × weight + 3.098 × height − 4.330 × age
Why do results differ between sites?
Basal metabolic rate calculations differ between sites because different estimation formulas are used. For example, for a 30-year-old male who is 170 cm and weighs 65 kg, the Harris-Benedict equation (revised version) yields approximately 1,605 kcal, while the Mifflin-St Jeor equation yields approximately 1,568 kcal.
- Difference between estimated and actual values：Estimation formulas are based on average relationships from measurement data of many people, so actual basal metabolic rate may differ for people with more or less muscle mass.
Safety and Privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
Calculation of basal metabolic rate is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
Sex, age, height, and weight you entered and input suggestions are not stored on the server.
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Updates
- update #299
Basal Metabolic Rate Calculator added: displays BMR from sex, age, height, and weight