How to calculate metabolic rate by also taking body composition into account?

Question
Hello Dr. Ryan:
My name is Ileana, I have a question regarding metabolic rate and body composition.
I looked up the BMR and RMR formula, and noticed that the equations only involve variables such as age, weight, height and sex. Since I heard that increasing the muscle weight could also speed up the metabolic rate (I know there is activity factor which I can apply but I think it's abit rough..), I was wondering if you could advice me if there is a formula that could help me calculate metabolic rate by incorporating not only variables such as age, height, sex and weight but also muscle weight or fat weight, so that I can monitor and find out my metabolic rate more accurately.

Thank you very much for your help!

Kind Regards,
Ileana

Answer
In my limited research on your question, I was unable to find a specific formula to incorporate any variables pertaining to percentage of muscle or fat by bodyweight.

I would recommend asking an exercise physiologist about that aspect of monitoring a more pinpoint metabolic rate.  They specialize in calculations of that type.

Thank you for your question, Ileana.  I hope that my answer leads you to the information you seek.

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