Why TDEE Matters
If you only learn one number for weight management, make it your TDEE (Total Daily Energy Expenditure). It is the total calories you burn in a day, and it is the single most useful number for planning weight loss, muscle gain, or maintenance. Eat below TDEE and you lose weight. Eat above it and you gain. Match it and you stay the same.
This guide walks you through calculating TDEE step by step. For an instant result, use our free TDEE calculator.
Step 1: Calculate Your BMR
TDEE starts with BMR — your resting calorie burn. Using the Mifflin-St Jeor formula:
- Men: 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
- Women: 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161
Example: a 30-year-old woman, 68 kg, 168 cm → 10×68 + 6.25×168 − 5×30 − 161 = 1,419 kcal. Need help? Use the BMR calculator.
Step 2: Choose Your Activity Level
This is where most people go wrong — they overestimate. Be honest:
| Level | Multiplier | Description |
|---|---|---|
| Sedentary | × 1.2 | Desk job, no exercise |
| Lightly active | × 1.375 | Light exercise 1–3 days/week |
| Moderately active | × 1.55 | Moderate exercise 3–5 days/week |
| Very active | × 1.725 | Hard exercise 6–7 days/week |
| Extra active | × 1.9 | Physical job + training |
Step 3: Multiply BMR by Your Activity Factor
Using our example (BMR 1,419, moderately active): 1,419 × 1.55 = 2,199 kcal/day. That is her TDEE.
Step 4: Apply Your Goal
- Fat loss: TDEE − 300 to 500 kcal → ~1,700–1,900 kcal/day
- Muscle gain: TDEE + 200 to 300 kcal → ~2,400–2,500 kcal/day
- Maintenance: Eat at TDEE → ~2,200 kcal/day
For a precise deficit target, use the calorie deficit calculator.
Common Mistakes to Avoid
- Overestimating activity — When in doubt, pick the lower level.
- Forgetting to recalculate — TDEE drops as you lose weight. Recheck every 4–6 weeks.
- Ignoring NEAT — Everyday movement (walking, fidgeting) can add hundreds of calories.
- Treating TDEE as fixed — It varies daily based on activity, stress, and sleep.
Pro Tip The most accurate way to verify your TDEE is to track food intake and weight for 2–3 weeks. If your weight is stable, your average intake IS your TDEE.