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What is TDEE?
TDEE stands for Total Daily Energy Expenditure, which is the total amount of calories your body uses over an entire day. It includes your Basal Metabolic Rate (the energy needed to keep you alive at rest), the energy required to digest and process food, and the calories burned through all movement and exercise.
Why Your TDEE Matters
- Weight control: Consuming fewer calories than your TDEE creates an energy shortfall that leads to fat loss, while consistently eating more than your TDEE supports weight and muscle gain. The size of this difference influences how quickly your body weight changes.
- Meal planning: Knowing your daily calorie target lets you divide it into protein, carbohydrate, and fat goals that match your training style and lifestyle.
- Performance: Eating well below your TDEE for long periods can hurt recovery, hormones, and training quality, while constantly overeating can limit how efficiently you progress.
The Mifflin–St Jeor Formula
This calculator uses the Mifflin–St Jeor equation, which research in the American Journal of Clinical Nutrition has shown to be one of the most accurate ways to estimate resting metabolic rate in healthy adults.
Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Your TDEE is then calculated as:
TDEE = BMR × activity factor
Activity factors typically range from 1.2 (little movement) to 1.9 (very intense activity).
Activity Levels
- Sedentary (1.2): Desk or seated work, very little walking, no regular exercise.
- Light exercise (1.375): Gentle activity 1–3 days per week, such as casual walking or easy yoga.
- Moderate exercise (1.55): Planned workouts or sports 3–5 days per week.
- Heavy exercise (1.725): Intense training 6–7 days per week, physically demanding jobs, or competitive sports.
- Athlete (1.9): Multiple daily training sessions, highly physical occupations, or elite‑level sports.
How to Use Your TDEE
Treat your TDEE as a starting estimate rather than a perfect number. Use it consistently for 2–3 weeks while monitoring your body weight; if your weight stays stable, your estimate is likely close, while ongoing gain or loss suggests you should adjust by about 100–200 calories and reassess. For fat loss, many people do well with a daily deficit of roughly 250–500 calories, and for building muscle a daily surplus of about 200–350 calories often supports progress without excessive fat gain.
Frequently asked questions
What does TDEE mean?
TDEE stands for Total Daily Energy Expenditure, which is the total number of calories your body burns in a day from basic body functions, digesting food, and all physical activity combined.
How is TDEE different from BMR?
BMR (Basal Metabolic Rate) is the number of calories your body needs just to stay alive at rest, while TDEE takes that BMR and adds on the calories you burn through movement, exercise, and daily tasks.
How many calories should I eat to lose weight?
A common approach is to eat fewer calories than your TDEE, usually creating a daily deficit of about 250–500 calories so that weight loss is steady but sustainable.
How accurate is this calculator?
Most TDEE calculators can only provide an estimate based on population formulas, so it gives you a solid starting point, but you may need to adjust your calories up or down over a few weeks based on how your actual weight changes.
Should I recalculate TDEE after losing weight?
Yes, you should update your TDEE when your body weight or activity level changes significantly, for example every 10–15 pounds of weight change or every couple of months, so your calorie targets stay aligned with your current body.
Which formula does this calculator use?
This calculator uses the Mifflin–St Jeor equation, a widely researched formula that is considered one of the most accurate methods for estimating basal metabolic rate in healthy adults.
Disclaimer
This calculator is for educational purposes only and does not replace personalized medical or nutrition advice.