Metabolic Rate Calculator
Calculate basal metabolic rate (BMR) and total daily energy expenditure (TDEE)
Understanding Metabolic Rate
Metabolic rate represents the energy expended by an organism for basic life functions. Our calculator helps determine basal metabolic rate (BMR) and total daily energy expenditure (TDEE) using various calculation methods.
Metabolic Rate Calculator
Calculate BMR and daily energy expenditure
Understanding Metabolic Rate
Basal Metabolic Rate
Understanding basic energy needs
- Resting energy expenditure
- Species differences
- Body composition effects
- Age and sex factors
Activity Factors
How activity affects metabolism
- Exercise intensity
- Daily movement
- Thermic effect of food
- Non-exercise activity
Environmental Effects
External factors affecting metabolism
- Temperature effects
- Climate adaptation
- Seasonal changes
- Habitat influence
Frequently Asked Questions
What is basal metabolic rate (BMR)?
Basal metabolic rate (BMR) is the minimum amount of energy required to maintain basic life functions at rest, such as breathing, circulation, and cell production. It represents about 60-75% of daily energy expenditure.
How does activity level affect metabolism?
Activity level increases total daily energy expenditure above BMR. The more active you are, the more energy you need. This is calculated using activity factors that multiply BMR to estimate total daily needs.
Why do metabolic rates vary between species?
Metabolic rates vary due to differences in body size, temperature regulation (warm vs. cold-blooded), activity levels, and evolutionary adaptations. Smaller organisms generally have higher metabolic rates per unit mass.
How does temperature affect metabolism?
Temperature significantly affects metabolism, especially in ectothermic (cold-blooded) animals. Generally, metabolic rate increases with temperature up to an optimal point, following the Q10 principle.
What factors influence BMR?
BMR is influenced by body size, composition (muscle vs. fat), age, sex, genetics, hormones, temperature, and health status. Regular exercise and muscle mass tend to increase BMR.
Important Notes
- BMR varies by species and individual
- Activity level affects total expenditure
- Multiple calculation methods available
- Temperature affects metabolic rate
- Body composition impacts BMR
- Regular recalculation recommended