"How many calories should I eat to lose weight?" It's the question millions of people ask every year. And unfortunately, the answer isn't as simple as a universal number.
The truth: your caloric needs for weight loss depend on your age, sex, weight, height, activity level, and body composition. A sedentary 50 kg woman has very different needs from an active 90 kg man.
This complete guide will teach you to precisely calculate your personalized caloric needs and determine the optimal deficit for healthy, sustainable weight loss without slowing your metabolism or losing muscle.
The Caloric Deficit Explained Simply
The fundamental principle of weight loss
Calories consumed < Calories burned = Weight loss
Calories consumed = Calories burned = Maintenance
Calories consumed > Calories burned = Weight gain1 kg of body fat ≈ 7,700 calories. To lose 1 kg, you must create a total deficit of 7,700 kcal.
Example: A 500 kcal/day deficit × 7 days = 3,500 kcal/week ≈ 0.45 kg lost per week.
Step 1: Calculate Your Basal Metabolic Rate (BMR)
Your BMR represents the calories your body burns at absolute rest to maintain vital functions.
Mifflin-St Jeor Formula (most accurate)
Men:
BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5Women:
BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161Example: Man, 35 years, 85 kg, 178 cm → BMR = (10×85) + (6.25×178) - (5×35) + 5 = 1,792.5 kcal/day
Step 2: Calculate Your TDEE (Total Daily Energy Expenditure)
Multiply your BMR by your activity factor:
| Activity Level | Description | Factor |
|---|---|---|
| Sedentary | Desk job, no sport | ×1.2 |
| Lightly active | 1–3 sessions/week | ×1.375 |
| Moderately active | 3–5 sessions/week | ×1.55 |
| Very active | 6–7 sessions/week | ×1.725 |
| Extremely active | Physical job + daily sport | ×1.9 |
Step 3: Create Your Caloric Deficit
| Deficit Type | Daily Deficit | Weekly Loss | Ideal For |
|---|---|---|---|
| Gentle | 250 kcal | ~0.25 kg | Preserving muscle, athletes |
| Moderate | 500 kcal | ~0.5 kg | Most people — recommended |
| Aggressive | 750 kcal | ~0.75 kg | Short term only |
Never go below 1,200 kcal/day for women or 1,500 kcal/day for men without medical supervision.
Practical Strategies to Stay in Deficit
- Prioritize protein: 1.6–2.0 g/kg/day to preserve muscle and stay full
- Fill up on vegetables: low calorie, high fiber, high volume — maximizes satiety
- Limit liquid calories: sodas, juices, and alcohol add up quickly without filling you up
- Eat slowly: it takes 20 minutes for your brain to register fullness signals
- Sleep 7–9 hours: sleep deprivation increases ghrelin (hunger hormone) and impairs fat loss
Common Mistakes to Avoid
- Underestimating portions: studies show people underestimate by 20–40%. Use a scale or AI food tracking.
- Too aggressive a deficit: below 1,200 kcal, your metabolism slows, you lose muscle, and rebound is almost inevitable
- Weekend compensation: 2 days of overeating can erase a whole week of deficit
- Neglecting resistance training: without muscle work, 25–30% of weight lost is muscle
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