This calculator estimates your Basal Metabolic Rate (BMR) — the number of calories your body burns to perform basic life-sustaining functions (like breathing, circulation, and cell production) while at rest.
For a 30-year-old female weighing 60 kg and 165 cm tall: BMR = 10 × 60 + 6.25 × 165 − 5 × 30 − 161 = 600 + 1031.25 − 150 − 161 = 1,320 kcal/day. This is her resting energy cost.
Frequently Asked Questions
BMR is the minimum number of calories your body needs to survive at rest. It does not include the calories burned from moving, digesting food, or daily activities.
This calculator uses the Mifflin-St Jeor equation, which was introduced in 1990 and is currently considered the standard for calculating metabolic rate.
BMR is measured under strict laboratory conditions after waking up. Resting Metabolic Rate (RMR) is measured under looser conditions and includes slight energy costs, making it about 10% higher than BMR.
The most effective way to increase BMR is to build lean muscle mass. Muscle is more metabolically active than fat, meaning it burns more calories even when you are completely at rest.
Yes. BMR naturally decreases as you age. This is due to a natural loss of lean muscle tissue and changes in hormonal activity, which slows down overall metabolic rate.