There's no single number that works for everyone — your ideal calorie intake depends on your age, gender, height, weight, and how active you are. That said, here are some general ranges:

• Women: Most women lose weight eating 1,200–1,600 calories per day
• Men: Most men lose weight eating 1,500–2,000 calories per day

The best approach is to use this calculator to find your TDEE, then subtract 500 calories for a moderate, sustainable deficit of about 1 pound per week. Never go below 1,000 calories (women) or 1,200 calories (men) without medical supervision.

A 500-calorie deficit is better for most people. Here's why:

• Sustainability: A 500-calorie deficit is easier to maintain long-term without feeling deprived
• Muscle preservation: Slower weight loss preserves more lean muscle mass
• Less metabolic adaptation: Your metabolism slows down less with a moderate deficit
• Better energy: You'll have more energy for workouts and daily life

A 1,000-calorie deficit produces faster weight loss (~2 lbs/week), but comes with tradeoffs: more muscle loss, increased hunger, lower energy, and a higher risk of binge eating. It may be reasonable for people with a BMI over 30 who are working with a healthcare provider, but for most people, 500 calories is the sweet spot.

If the scale isn't moving despite being in a deficit, these are the most common causes:

1. You're eating more than you think. Studies show people underestimate calorie intake by 30–50% on average. Use a food scale and track everything, including oils, sauces, and drinks.
2. Water retention is hiding fat loss. Sodium, stress, poor sleep, menstrual cycles, and new exercise routines can all cause water retention that masks actual fat loss on the scale.
3. Your activity level is lower than estimated. Most people overestimate their activity level. If you're not sure, choose one level lower than you think.
4. Metabolic adaptation. After prolonged dieting, your body can become more efficient, burning fewer calories. Consider a 1-2 week "diet break" at maintenance calories.
5. Medical factors. Thyroid disorders, PCOS, medications, and other conditions can affect weight loss. See a doctor if you've been genuinely consistent for 4+ weeks with no results.

Track weekly weight averages rather than daily weigh-ins. Weight naturally fluctuates 2-5 lbs day to day, so a single weigh-in can be misleading.

In most cases, no — or at most, eat back only half of the exercise calories your tracker reports. Here's why:

• Fitness trackers and gym machines overestimate calories burned by 20-50%
• Your activity level selection in this calculator already accounts for exercise in your TDEE
• Eating back exercise calories can accidentally eliminate your deficit

The exception: if you're doing very high volumes of exercise (marathon training, multiple hours of daily activity), you may need to eat back a portion of exercise calories to maintain adequate energy and recovery. But for most people doing 3-5 workouts per week, the activity multiplier in the calculator already covers it.

You can estimate your calorie deficit manually in three steps:

1. Calculate your BMR using the Mifflin-St Jeor equation:
   • Men: (10 x weight in kg) + (6.25 x height in cm) - (4.92 x age) + 5
   • Women: (10 x weight in kg) + (6.25 x height in cm) - (4.92 x age) - 161
2. Multiply by your activity factor: Sedentary (1.2), Light (1.375), Moderate (1.55), Active (1.725), Very Active (1.9)
3. Subtract your deficit: Take 250-750 calories off the result. That's your daily calorie target.

Our calculator does this math instantly and also gives you a macro breakdown and goal date projection.

Yes — a calorie deficit is required for weight loss, but you don't necessarily have to count every calorie. Some strategies that create a deficit without strict tracking:

• Portion control: Use smaller plates, measure portions by hand (palm-sized protein, fist-sized carbs)
• Protein priority: Eat protein at every meal — it's the most filling macronutrient
• Reduce liquid calories: Cut sugary drinks, alcohol, and high-calorie coffee drinks
• Eat more vegetables: They add volume and nutrients with very few calories
• Mindful eating: Eat slowly, stop when 80% full, avoid eating while distracted

That said, calorie counting — even for a few weeks — is the most reliable way to understand your intake and develop an intuitive sense of portion sizes. Think of it as a learning tool, not a life sentence.

Diet drives weight loss. Exercise shapes your body composition and health. Both matter, but for different reasons:

• Diet controls the deficit. It's much easier to not eat 500 calories than to burn 500 calories through exercise (which takes about 45-60 minutes of vigorous exercise).
• Strength training preserves muscle. Without resistance training, up to 25% of weight loss can come from muscle. Lifting weights keeps that number much lower, so more of your weight loss comes from fat.
• Exercise boosts metabolism. Muscle is metabolically active tissue — the more you have, the higher your resting calorie burn.
• Movement improves health outcomes. Independent of weight loss, regular exercise reduces disease risk, improves mood, and enhances sleep quality.

The ideal approach: use your diet to create the calorie deficit, and use exercise (especially strength training) to preserve muscle, boost metabolism, and improve how your body looks at your goal weight.