TDEE Calculator Guide: How Many Calories Should You Eat Daily?
Every weight goal — lose, maintain, or gain — starts with the same number: your TDEE (Total Daily Energy Expenditure). It's the total calories your body burns in a day, including everything from breathing to running. Hit the right calorie target and the rest follows.
Our TDEE Calculator computes your number in seconds. This guide explains the science behind it and how to use the result.
What Is TDEE?
Your Total Daily Energy Expenditure is the sum of every calorie your body burns in a 24-hour period. It has four components:
- **BMR (Basal Metabolic Rate) — 60-75% of TDEE** — Calories burned just staying alive: breathing, circulation, cell repair. This is what you'd burn in a day of absolute bed rest.
- **Thermic Effect of Food (TEF) — 10% of TDEE** — Digestion, absorption, and processing of food. Protein has the highest TEF (20-30% of protein calories are burned digesting it).
- **Exercise Activity Thermogenesis (EAT) — 15-30% of TDEE** — Planned exercise. The most variable component and the easiest to overestimate.
- **Non-Exercise Activity Thermogenesis (NEAT) — 5-15% of TDEE** — Everything else: walking, fidgeting, standing, chores. This varies wildly between individuals.
The Mifflin-St Jeor Equation: The Gold Standard
The Mifflin-St Jeor equation is the most accurate BMR formula for the general population, validated in clinical studies since 1990:
**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**
This gives you your BMR. To get your TDEE, multiply by an activity factor that reflects your real life:
| Activity Level | Multiplier | Example |
|---|---|---|
| Sedentary | × 1.2 | Desk job, little to no exercise, TV evenings |
| Lightly Active | × 1.375 | Light exercise or sports 1-3 days/week |
| Moderately Active | × 1.55 | Moderate exercise or sports 3-5 days/week |
| Very Active | × 1.725 | Hard exercise or sports 6-7 days/week |
| Extra Active | × 1.9 | Very hard exercise, physical job, or 2x training |
**Common mistake:** People overestimate their activity level by one full tier. If you sit at a desk 8 hours and gym for 45 minutes, you're sedentary or light — not moderate. Start conservative and adjust based on results.
Using Your TDEE: Calorie Targets for Every Goal
| Goal | Daily Calories | Expected Rate |
|---|---|---|
| Aggressive fat loss | TDEE − 1,000 | 2 lbs/week (not recommended long-term) |
| Steady fat loss | TDEE − 500 | 1 lb/week (the gold standard) |
| Maintenance | TDEE | Weight stable |
| Lean bulk | TDEE + 300 | 0.5 lb/week (minimal fat gain) |
| Aggressive bulk | TDEE + 500 | 1 lb/week (more fat gain) |
Example: A 35-year-old male, 6'0", 180 lbs, moderately active. His BMR is 1,825 calories. His TDEE is 1,825 × 1.55 = **2,829 calories/day.**
To lose 1 lb/week, he eats **2,329 calories/day.** To gain muscle slowly, he eats **3,129 calories/day.**
Macro Splits: What to Eat Within Your Calorie Budget
Your calorie target sets the pace. Your macro split sets the quality. Here are evidence-based starting points:
| Goal | Protein | Fat | Carbs |
|---|---|---|---|
| Fat Loss | 30-35% (1g/lb bodyweight) | 25-30% | 35-45% |
| Maintenance | 25-30% | 25-30% | 40-50% |
| Muscle Gain | 25-30% (0.8-1g/lb) | 20-25% | 45-55% |
For our 2,329-calorie fat-loss example: Protein = 180 lbs × 1g = 180g × 4 cal = 720 cal (31%). Fat = 2,329 × 0.25 = 582 cal ÷ 9 = 65g. Carbs = remaining = 1,027 cal ÷ 4 = 257g.
Our Macro Split Calculator does this math automatically for any calorie target.
Why Your TDEE Changes Over Time
- **Weight loss lowers TDEE** — A lighter body burns fewer calories. Lose 20 lbs and your TDEE drops by 150-250 calories. You must recalibrate to keep losing.
- **Muscle gain raises TDEE** — Muscle tissue is metabolically active. More muscle = higher BMR = faster metabolism.
- **Age decreases BMR** — You lose 3-5% of muscle mass per decade after 30. Recalculate every year or two.
- **Adaptive thermogenesis** — Prolonged calorie restriction slows your metabolism beyond what weight loss alone predicts. Diet breaks and reverse dieting help.
Related Calculators on ParseAtlas
- TDEE Calculator — Your daily calorie needs based on activity level
- Macro Split Calculator — Protein, carbs, and fat breakdown for your goal
- BMI Calculator — Screen your weight category
- Body Fat Calculator — Estimate your body fat percentage
- Calorie Burn Calculator — Track exercise calories burned
TDEE is the foundation of every effective nutrition plan. Get your number right, eat consistently at the right level, and the results follow. The tools that do the math exist — the only variable left is you.