What does this tool do?
Basal metabolic rate is the energy used for breathing, circulation, cell repair and other resting functions. This calculator uses the Mifflin-St Jeor equation, one of the more accurate simple BMR formulas for adults.
The Formula
BMR = 10 × Weight (kg) + 6.25 × Height (cm) − 5 × Age + Sex adjustment (male +5, female −161)Frequently Asked Questions
Is BMR the same as maintenance calories?
No. BMR covers only resting functions. Maintenance calories also include movement, exercise and digestion, so they are usually 20–50% higher.
Why does BMR fall with age?
Lean mass tends to decline with age, and that lowers resting energy use. Resistance training and adequate protein help preserve lean mass.