Estimate your Basal Metabolic Rate and daily caloric needs using Mifflin-St Jeor.
Daily Caloric Targets
Basal Metabolic Rate (BMR)1,662 kcal
Maintenance Calories1,994 kcal
Weight Loss (Mild - 0.25kg/week)1,744 kcal
Weight Loss (Standard - 0.5kg/week)1,494 kcal
Weight Gain (Standard)2,494 kcal
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Technical Overview & How It Works
Definition & Core Concept
The Basal Metabolic Rate (BMR) Calculator estimates the number of calories your body burns at rest to maintain vital physiological functions. This serves as a baseline for creating custom dietary and weight management strategies.
To get the most out of this online utility, follow these standard practices:
First, ensure that your input data is free of stray control characters or formatting anomalies.
Second, use the built-in "Load Demo" buttons to inspect standard inputs and preview correct formatting structures.
Lastly, leverage keyboard shortcuts (like Ctrl+A and Ctrl+C) to quickly copy the processed output results without manual cursor dragging.
This ensures a streamlined and error-free workflow for all your development and calculation tasks.
Key Features & Privacy Benchmarks
100% Client-Side Processing: All computations execute locally in your web browser with 0 ms server delay, ensuring instant feedback and responsiveness.
Data Security: No inputs are transmitted to external servers, stored on, or logged in database records, guaranteeing complete privacy for sensitive information.
Standards Compliance: Calculated using the Mifflin-St Jeor Equation, widely accepted as the standard in modern dietetics.
Frequently Asked Questions
What is Basal Metabolic Rate (BMR) and how is it calculated?
Basal Metabolic Rate (BMR) is the minimum number of calories your body needs to perform basic life-sustaining functions (like breathing and circulation) at rest. It is calculated using equations based on height, weight, age, and sex.
What is the Harris-Benedict formula for BMR?
The Harris-Benedict formula calculates BMR as: For Men: BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age in years). For Women: BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age in years).
What is the Mifflin-St Jeor formula for BMR?
The modern Mifflin-St Jeor formula calculates BMR as: For Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5. For Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161.
What is Active Metabolic Rate (AMR) or TDEE?
Active Metabolic Rate (AMR) or Total Daily Energy Expenditure (TDEE) is the total number of calories you burn daily, calculated by multiplying your BMR by an activity multiplier based on your exercise level.
How many calories should I eat to lose weight?
To lose weight safely, aim for a daily calorie deficit of 500 to 700 calories below your TDEE/AMR, which generally leads to a steady loss of 0.5 to 1 kg per week.
How do I calculate calories to build muscle mass?
To build muscle, combine strength training with a calorie surplus of 300 to 500 calories above your TDEE, ensuring sufficient daily protein intake.
Does BMR decrease as we get older?
Yes, BMR generally declines with age due to muscle mass loss and changes in metabolic processes, which is why age is a critical variable in the formulas.
Why is biological sex a key factor in BMR calculations?
On average, men have higher muscle mass and lower body fat percentages than women of similar height and weight, which results in a higher baseline metabolic rate.
Can I select between metric and imperial units?
Yes, this calculator allows you to enter weight in kilograms or pounds, and height in centimeters or feet and inches, converting them automatically.
Is the calorie calculation private and secure?
Yes, all computations are processed locally within your browser. Your age, height, and weight are never stored or transmitted to external servers.