Scientific Calorie Calculator
Calculate your exact daily maintenance calories, BMR, TDEE, and macro targets for fat loss, maintenance, or muscle growth with laboratory precision.
Energy Expenditure & Body Fat Calculators
1. Basal Metabolism (BMR)
The essential caloric energy your vital organs, brain, and cellular processes burn every 24 hours at complete rest.
2. Total Daily Burn (TDEE)
Your real-world caloric expenditure factoring in non-exercise activity (NEAT), workouts, and dietary thermogenesis.
3. Deficit / Surplus Target
Tailored macro prescription (Protein, Carbs, Fat) designed to preserve muscle tissue while shedding body fat.
Frequently Asked Questions About Calories & TDEE
How does this calorie calculator work?
This calculator utilizes the Mifflin-St Jeor formula, widely recognized by the Academy of Nutrition and Dietetics and clinical dietitians as the most accurate method for calculating Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE).
What is a calorie deficit and how do I calculate it?
A calorie deficit occurs when you consume fewer calories than your body burns in a day. For safe and sustainable fat loss of approximately 1 pound per week, a moderate deficit of 300 to 500 calories below your TDEE is clinically recommended.
How many calories should I eat to lose weight?
Subtract 300-500 calories from your Total Daily Energy Expenditure (TDEE). For example, if your maintenance TDEE is 2,300 kcal/day, eating 1,800-2,000 kcal/day will result in steady, healthy fat loss while preserving lean muscle mass.
What is the difference between BMR and TDEE?
BMR (Basal Metabolic Rate) is the minimum calories your body requires just to stay alive at complete rest (breathing, organ function). TDEE (Total Daily Energy Expenditure) is your BMR multiplied by your physical activity level and represents your true daily calorie burn.