iPhone app BMR & TDEE Calculator

It is the equivalent of figuring out how much gas an idle car consumes while parked.
In such a state, energy will be used only to maintain vital organs, which include the heart, lungs, kidneys, nervous system, intestines, liver, lungs, sex organs, muscles, and skin.
For most people, upwards of ~70% of total energy (calories) burned each day is due to upkeep.
Physical activity makes up ~20% of expenditure and ~10% is used for the digestion of food, also known as thermogenesis.

The BMR is measured under very restrictive circumstances while awake.
An accurate BMR measurement requires that a persons sympathetic nervous system is inactive, which means the person must be completely rested.
Basal metabolism is usually the largest component of a persons total caloric needs.
The daily caloric need is the BMR value multiplied by a factor with a value between 1.2 and 1.9, depending on activity level.,

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