How Many Calories Should I Eat to Lose Weight? (Complete Science-Based Guide + Examples)

A calorie is a unit of energy. Your body uses calories for everything — breathing, walking, thinking, exercising, and even sleeping. Every day, your body burns a certain number of calories. This is called your Total Daily Energy Expenditure (TDEE). If you eat: • More calories than you burn → you gain weight • The same number of calories → you maintain weight • Fewer calories than you burn → you lose weight Weight loss happens when you consistently create a calorie deficit. This is not a diet trend — it is basic biology.

A calorie deficit happens when you consume fewer calories than your body needs to maintain its current weight. For example: If your body burns 2,200 calories per day and you eat 1,700 calories, you are in a 500-calorie deficit. Over time, this forces your body to use stored fat for energy. A moderate calorie deficit is usually: • 300–500 calories per day for sustainable fat loss • 500–750 calories per day for faster results Extreme deficits may lead to: • Fatigue • Muscle loss • Slow metabolism • Binge eating • Hormonal imbalance That is why balance is important.

Step 1: Estimate Your Maintenance Calories (TDEE) Your maintenance calories depend on: • Age • Gender • Height • Weight • Activity level Step 2: Subtract a Deficit Once you know your maintenance calories, subtract 300–500 calories. Example: If your maintenance is 2,000 calories: • For slow fat loss → 1,700–1,800 calories • For faster fat loss → 1,500–1,600 calories This creates sustainable weight loss without extreme restriction.

Here are general examples (individual needs vary): Sedentary woman: Maintenance: ~1,800–2,000 calories Fat loss target: 1,300–1,600 calories Moderately active woman: Maintenance: ~2,000–2,200 calories Fat loss target: 1,600–1,800 calories Very active woman: Maintenance: ~2,200–2,400+ calories Fat loss target: 1,800–2,000 calories Remember: These are estimates. The best number depends on your body and activity level.

Sedentary man: Maintenance: ~2,200–2,400 calories Fat loss target: 1,700–2,000 calories Moderately active man: Maintenance: ~2,400–2,800 calories Fat loss target: 1,900–2,300 calories Very active man: Maintenance: 2,800+ calories Fat loss target: 2,200–2,500+ calories Men typically require more calories due to higher muscle mass.

Healthy fat loss rate: • 0.5–1% of body weight per week Example: If you weigh 160 lbs (73 kg): A realistic goal is 0.8–1.6 lbs per week. Losing weight too quickly can increase: • Muscle loss • Hunger • Fatigue • Rebound weight gain Sustainable progress beats extreme dieting.

1. Underestimating calories Many people eat more than they think, especially with snacks, sauces, drinks, and restaurant food. 2. Not tracking consistently Without tracking, it is difficult to know if you are truly in a deficit. 3. Cutting calories too aggressively This slows metabolism and increases cravings. 4. Ignoring protein intake Low protein can lead to muscle loss. 5. Expecting daily scale changes Weight fluctuates due to water, salt, hormones, and digestion. Focus on weekly trends instead.

Very low-calorie diets can work short term but are difficult to sustain. Problems with extreme restriction: • Energy drops • Hormones may be affected • Muscle loss risk increases • Higher chance of binge eating For most people, a moderate calorie deficit is the best strategy.

Protein is extremely important during fat loss. Benefits: • Preserves muscle mass • Reduces hunger • Increases fullness • Helps maintain metabolism General recommendation: 0.7–1 gram of protein per pound of body weight. High-protein diets make calorie control easier.

No. Counting calories is a tool — not a life sentence. Many people use calorie tracking to: • Learn portion sizes • Understand food energy • Build awareness Over time, you may develop intuitive habits. However, tracking can be extremely helpful during fat loss phases.

Here's a practical, repeatable way to set your calorie target without spreadsheets or guesswork. 1. Estimate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor formula: • Men: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5 • Women: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161 2. Multiply by an activity factor to get your TDEE (maintenance): • Sedentary (desk job, little exercise): × 1.2 • Lightly active (light exercise 1–3 days/week): × 1.375 • Moderately active (exercise 3–5 days/week): × 1.55 • Very active (hard training 6–7 days/week): × 1.725 3. Subtract 300–500 calories from TDEE to create your weight-loss target. Example: a 35-year-old woman, 5'6" (168 cm), 165 lb (75 kg), moderately active: • BMR: (10 × 75) + (6.25 × 168) − (5 × 35) − 161 = 1,464 • TDEE: 1,464 × 1.55 ≈ 2,269 • Weight-loss target: 1,769–1,969 calories per day If doing the math by hand feels tedious, plug the same numbers into a calorie calculator or TDEE calculator — they use the exact same formulas.

Hitting your calorie number is the main driver of fat loss, but macro split affects how hungry you feel, how much muscle you keep, and how sustainable the plan is. A solid starting framework for weight loss: • Protein: 0.8–1 g per pound of body weight (about 30% of calories for most people) • Fat: 20–30% of calories (healthy fats from olive oil, nuts, avocado, fatty fish) • Carbs: the remainder, mostly from whole grains, fruit, and vegetables For a 1,800-calorie fat-loss plan on a 160 lb person, this might look like 140 g protein, 50–60 g fat, and 180–200 g carbs. High protein is the single biggest variable people underestimate — it preserves muscle mass, reduces hunger, and burns more energy to digest. Use a macro goal calculator to automate the split, and log meals in Eati to check that your day actually lands within range. If you struggle with constant hunger, see how to stay in a calorie deficit without feeling hungry for food choices that stretch fewer calories.

Your calorie needs change as your body changes. Expecting the same number to work for 12 months is one of the main reasons progress stalls. A good review rhythm: • Every 2–3 weeks: compare your 7-day average weight to three weeks ago. • Drop rate of 0.5–1% of body weight per week: keep calories the same. • No meaningful change for 3–4 weeks (and tracking is honest): subtract 100–150 calories, or add 1,000–2,000 daily steps. • Dropping faster than 1.5%/week (after week 1): add 100–150 calories — you're underfueling. When you hit your goal weight, transition gradually to maintenance by adding back 100–150 calories per week over 3–4 weeks. This slow ramp helps prevent the bounce-back that happens when people jump straight from restriction to pre-diet eating. For more context, read how long does it take to lose weight in a calorie deficit and what is a calorie deficit.