How Many Calories to Lose 1 Pound a Week? (2025 Science-Based Guide)
The short answer: a 500-calorie daily deficit. But the full picture is more nuanced — and knowing the details makes the difference between frustrating plateaus and consistent results.
Use our free calorie calculator to get your exact TDEE and daily calorie goal based on your age, weight, height, and activity level.
Calculate My Calories →The Basic Math: Calories and Weight Loss
One pound of body fat contains roughly 3,500 calories. To lose one pound per week, you need to create a deficit of 3,500 calories over 7 days — or about 500 calories per day.
This is the foundation. Everything else builds on it.
The Simple Formula
- 1Find your TDEE (Total Daily Energy Expenditure) — calories you burn daily
- 2Subtract 500 calories → target for 1 lb/week loss
- 3Subtract 250 calories → target for 0.5 lb/week loss
- 4Subtract 1,000 calories → target for 2 lb/week loss (maximum recommended)
What Is TDEE and Why Does It Matter?
Your TDEE is the total number of calories you burn in a day — including exercise, walking, even digesting food. It's the starting point for any calorie goal.
TDEE is calculated from your BMR (Basal Metabolic Rate — calories burned at rest) multiplied by an activity factor. Two people who weigh the same can have very different TDEEs depending on how active they are.
| Activity Level | Example | TDEE Multiplier |
|---|---|---|
| Sedentary | Desk job, no exercise | BMR × 1.2 |
| Lightly active | Light exercise 1–3 days/week | BMR × 1.375 |
| Moderately active | Exercise 3–5 days/week | BMR × 1.55 |
| Very active | Hard exercise 6–7 days/week | BMR × 1.725 |
| Extra active | Physical job + daily training | BMR × 1.9 |
The 3,500-Calorie Rule — Is It Still Accurate?
The "3,500 calories = 1 pound" rule has been around since the 1950s. Modern research shows it's a useful approximation, not an exact science.
Here's why real-world results differ:
- Metabolic adaptation: As you lose weight, your body burns fewer calories at rest. A 200-lb person and a 160-lb person have different TDEEs even if they're the same height.
- Muscle vs. fat loss: In a calorie deficit, some weight lost is muscle (especially without resistance training), which has fewer calories per pound than fat.
- Water weight: Early weight loss often includes water weight, which can make results look faster — or slower — than the math predicts.
- Individual variation: Gut microbiome, hormone levels, sleep quality, and genetics all affect how efficiently your body uses calories.
The practical takeaway: aim for a 500-calorie daily deficit and expect roughly 1 lb/week on average over time, not necessarily every single week.
How Many Calories Should You Eat Per Day?
This depends entirely on your personal TDEE. But here are reference ranges for average Americans:
| Goal | Average Woman (moderately active) | Average Man (moderately active) |
|---|---|---|
| Maintain weight | ~2,000 cal/day | ~2,500 cal/day |
| Lose 0.5 lb/week | ~1,750 cal/day | ~2,250 cal/day |
| Lose 1 lb/week | ~1,500 cal/day | ~2,000 cal/day |
| Lose 2 lb/week | ~1,000 cal/day | ~1,500 cal/day |
Important: Never go below 1,200 calories (women) or 1,500 calories (men) without medical supervision. Severe restriction slows your metabolism, causes muscle loss, and is not sustainable.
The Safest Rate of Weight Loss
The CDC recommends losing 1 to 2 pounds per week for safe, sustainable weight loss. This rate:
- Preserves muscle mass (especially with protein intake of 0.7–1g per lb of body weight)
- Keeps metabolism from adapting too dramatically
- Is sustainable long-term without extreme hunger
- Produces better results at 1 year compared to aggressive restriction
Losing faster than 2 lbs/week is possible short-term but increases the risk of muscle loss, nutrient deficiencies, gallstones, and rebound weight gain.
Why Am I Not Losing Weight in a Calorie Deficit?
This is the most common frustration. If you're tracking calories but not losing weight, here are the most likely reasons:
- Underestimating portions: Studies consistently show people underestimate calorie intake by 20–40%. A food scale changes everything.
- Liquid calories: Lattes, juices, sports drinks, and alcohol add up fast and are easy to overlook.
- Overestimating exercise burn: A 30-minute run burns ~300 calories, not the 600 that fitness trackers often show.
- Metabolic adaptation: After weeks of restriction, your metabolism slows. A 1–2 week diet break at maintenance can reset this.
- Water retention: Stress, salt, carbohydrates, and hormones cause water weight fluctuation that can hide fat loss on the scale for weeks.
The solution: weigh food, track consistently for 2 weeks, and look at trends — not daily weigh-ins.
Practical Tips to Hit Your Calorie Goal
- Eat more protein: 30g of protein per meal keeps you fuller longer and burns more calories during digestion (thermic effect)
- Volume eating: Fill half your plate with vegetables — high volume, low calorie, keeps hunger away
- Don't drink your calories: Swap sugary drinks for water, black coffee, or unsweetened tea
- Meal prep Sunday: Prepared meals = no impulse decisions when hungry
- Use an app: MyFitnessPal or Cronometer make calorie tracking fast once you build the habit
- Sleep 7–9 hours: Poor sleep increases hunger hormones (ghrelin) and makes dieting significantly harder
Stop guessing. Our free calorie calculator uses the Mifflin-St Jeor equation to give you your personal TDEE and daily calorie targets for every goal.
Calculate My Daily Calories →