Which BMR formula gives the most accurate result?

The Mifflin-St Jeor equation is generally considered the most accurate for most people, but the Katch-McArdle formula may be more precise if you know your body fat percentage, as it uses lean mass rather than total weight.

Can I use this calculator if I am very muscular or very lean?

The standard formulas estimate based on average body composition; highly muscular individuals may burn more calories at rest than the result shows, while very lean individuals may have lower BMR values than predicted.

What is the difference between BMR and RMR?

BMR (basal metabolic rate) measures calories burned at complete rest in strict conditions, while RMR (resting metabolic rate) reflects calories burned at rest during normal daily activities and is typically 10-20% higher than BMR.

How do I calculate my total daily calorie needs?

After finding your BMR, multiply it by an activity factor ranging from 1.2 (sedentary) to 1.9 (very active) to estimate your total daily energy expenditure for weight maintenance or loss goals.

Body Metrics & FitnessTool Review

BMR Calculator (Basal Metabolic Rate, Mifflin St Jeor Equation)

Provided byOmni Calculatoromnicalculator.com

Use the BMR calculator to determine how many calories you should consume while resting all day, and learn how much en...

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About this tool

What BMR Calculator (Basal Metabolic Rate, Mifflin St Jeor Equation) does

The BMR Calculator on Omni Calculator estimates the number of calories your body burns at complete rest using the Mifflin-St Jeor equation as the default method. Users input age, height, weight, and sex to receive a personalized basal metabolic rate score, with the option to switch between six established formulas including Harris-Benedict and Katch-McArdle. The site provides clear explanations of what BMR represents, how the calculations differ by gender, and the factors that influence metabolic rate, helping users understand the science behind the number rather than just outputting a raw figure.

Step by step

How to use the Omni Calculator BMR Calculator (Basal Metabolic Rate, Mifflin St Jeor Equation)

1
Select your sex from the Male or Female dropdown to set the appropriate formula parameters
2
Enter your age in years to account for metabolic changes over time
3
Input your height in centimeters and weight in kilograms for the calculation
4
View your basal metabolic rate result and toggle 'Show additional information' to see maintenance calorie estimates and energy expenditure breakdowns

Is it right for you

Best for

This option suits anyone needing a quick, formula-based estimate of resting calorie burn without needing body composition data, particularly those comparing different BMR equations or learning how age, height, and sex affect metabolism.

Limitations

Results are estimates based on population averages and do not account for individual muscle mass or fitness level
Requires metric units (centimeters and kilograms) with no imperial unit conversion option
BMR figure represents rest-only calorie burn and does not include daily activity factors unless using the maintenance calorie calculator

Questions

BMR Calculator (Basal Metabolic Rate, Mifflin St Jeor Equation) FAQ

Which BMR formula gives the most accurate result?: The Mifflin-St Jeor equation is generally considered the most accurate for most people, but the Katch-McArdle formula may be more precise if you know your body fat percentage, as it uses lean mass rather than total weight.
Can I use this calculator if I am very muscular or very lean?: The standard formulas estimate based on average body composition; highly muscular individuals may burn more calories at rest than the result shows, while very lean individuals may have lower BMR values than predicted.
What is the difference between BMR and RMR?: BMR (basal metabolic rate) measures calories burned at complete rest in strict conditions, while RMR (resting metabolic rate) reflects calories burned at rest during normal daily activities and is typically 10-20% higher than BMR.
How do I calculate my total daily calorie needs?: After finding your BMR, multiply it by an activity factor ranging from 1.2 (sedentary) to 1.9 (very active) to estimate your total daily energy expenditure for weight maintenance or loss goals.

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