What this calculator measures
Your Basal Metabolic Rate (BMR) is the minimum number of calories your body needs to sustain basic life functions at complete rest — breathing, circulation, temperature regulation, and organ function. BMR accounts for roughly 60–70% of total daily energy expenditure for most sedentary individuals.
How this calculator works
We use the Mifflin-St Jeor equation (1990), which is the most consistently validated BMR formula across large adult populations: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5 (men) or −161 (women). BMR is not the same as TDEE — it does not account for physical activity, and you should not use BMR as your daily calorie target.
How to use your result
Use BMR as a foundation for understanding your energy needs. To calculate how many calories you actually need day-to-day, multiply your BMR by your activity factor to get TDEE. If you want a number to eat at for gradual weight loss, use TDEE minus a 10–20% deficit, not BMR directly.
Important limitation
Calculator results are estimates. Pregnancy, eating disorders, medical conditions, injuries, or concerning symptoms require qualified professional guidance.