What is this Tool?
The TDEE (Total Daily Energy Expenditure) Calculator tells you exactly how many calories your body burns in a day — including your basal metabolic rate (calories burned at rest) plus the energy used for all physical activity. Knowing your TDEE is the foundation of any successful diet or nutrition plan, whether your goal is fat loss, muscle gain, or maintenance.
Frequently Asked Questions
Q: What is BMR?
A: BMR (Basal Metabolic Rate) is the number of calories your body needs to maintain basic functions at rest — breathing, circulation, organ function. It accounts for 60-70% of your TDEE.
Q: What formula does this use?
A: This calculator uses the Mifflin-St Jeor equation, which is considered the most accurate formula for estimating BMR in most adults.
Q: How do I use TDEE to lose weight?
A: Eat 300-500 calories below your TDEE for steady, sustainable fat loss of 0.3-0.5kg per week. Eating too far below TDEE causes muscle loss and metabolic adaptation.
Q: Why is my TDEE different from other calculators?
A: Small differences are normal between calculators using different formulas. The Mifflin-St Jeor formula used here is the most widely validated in research.