What is the difference between BMR and TDEE?
BMR is what you burn lying still for 24 hours — usually 60–70% of your total. TDEE adds digestion, daily movement and exercise, and is the number to use for diet planning.
Calculate your Basal Metabolic Rate (BMR) to understand how many calories your body burns at rest using the Mifflin-St Jeor equation.
BMR (Mifflin-St Jeor) = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5 (men) or − 161 (women). TDEE = BMR × activity factor (1.2 sedentary to 1.9 athlete).
A 30-year-old man, 80 kg and 180 cm, has a BMR of about 1,780 calories. Lightly active (×1.375) his TDEE is roughly 2,450 calories per day.
BMR is what you burn lying still for 24 hours — usually 60–70% of your total. TDEE adds digestion, daily movement and exercise, and is the number to use for diet planning.
Mifflin-St Jeor was validated on modern populations and is typically within 10% of measured values, while the 1919 Harris-Benedict equation overestimates by around 5% for most people.
Yes, modestly. Sustained deficits reduce BMR through lost lean mass and adaptive thermogenesis — usually 5–15%. Resistance training and adequate protein blunt most of that drop.