TDEE Explained: What It Is and How to Calculate It
What Is TDEE?
TDEE stands for Total Daily Energy Expenditure — the total number of calories your body burns in a day, accounting for everything from keeping your heart beating to your afternoon workout. It is your maintenance calorie level: eat at this amount and your weight stays the same.
Understanding your TDEE is the foundation of any diet or fitness plan. Without it, calorie recommendations are meaningless guesses.
The Four Components of TDEE
1. Basal Metabolic Rate (BMR) — 60–75% of TDEE
Your BMR is the energy your body needs to sustain basic biological functions at complete rest: breathing, circulation, temperature regulation, and cell repair. It is determined primarily by your body weight, height, age, and sex. A larger, younger, male body tends to have a higher BMR.
2. Thermic Effect of Activity (TEA) — 15–30% of TDEE
This is the energy burned through deliberate exercise — running, lifting weights, cycling, swimming. This is the component you have the most direct control over.
3. Non-Exercise Activity Thermogenesis (NEAT) — 6–10% of TDEE
NEAT covers all movement that is not intentional exercise: fidgeting, walking to the kitchen, standing, typing. It varies enormously between individuals and is why some people seem to "never gain weight" — they unconsciously move more throughout the day.
4. Thermic Effect of Food (TEF) — 8–10% of TDEE
Your body burns calories digesting and processing food. Protein requires the most energy to digest (~25–30% of its calories), followed by carbohydrates (~6–8%) and fats (~2–3%). This is why high-protein diets have a metabolic advantage.
How to Calculate Your TDEE
The standard approach is to calculate your BMR using the Mifflin-St Jeor equation, then multiply by an activity factor.
Step 1: Calculate BMR (Mifflin-St Jeor)
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) − 161Step 2: Multiply by Activity Factor
| Activity Level | Description | Multiplier |
|---|---|---|
| Sedentary | Little or no exercise, desk job | × 1.2 |
| Lightly active | Exercise 1–3 days/week | × 1.375 |
| Moderately active | Exercise 3–5 days/week | × 1.55 |
| Very active | Hard exercise 6–7 days/week | × 1.725 |
| Extra active | Very hard exercise, physical job | × 1.9 |
Calculate Your TDEE Instantly
Skip the math — use our free TDEE Calculator and Calorie Calculator to find your maintenance calories in seconds.
How to Use Your TDEE
- Lose fat: Eat 300–500 calories below TDEE per day. A 500-calorie deficit produces roughly 0.5 kg (1 lb) of fat loss per week.
- Gain muscle: Eat 200–300 calories above TDEE (a "lean bulk"). A larger surplus adds fat alongside muscle.
- Maintain weight: Eat at your TDEE. This is also a good starting point if you are tracking for the first time.
Why TDEE Calculations Are Estimates
No formula can perfectly predict your metabolism. Individual variation in hormones, gut bacteria, NEAT, and genetics means your real TDEE might be 200–300 calories higher or lower than the calculation suggests. Track your weight and calories for 2–3 weeks, then adjust based on actual results rather than the formula alone.
Conclusion
Your TDEE is the calorie number everything else in your diet plan revolves around. Calculate it, use it as your starting point, and adjust based on real-world results. Use our TDEE Calculator to get your number in seconds.