Free Calorie Deficit Calculator
A calorie deficit means consuming fewer calories than your body burns each day. This calculator helps you set a sustainable deficit based on your TDEE so you can lose weight steadily without extreme restriction.
Calculate Your Calorie Deficit
Enter your details and choose a deficit level to get your daily calorie target.
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Part of our weight loss calculators hub—explore connected tools and practical guidance.
Choosing the Right Deficit
Very gradual. Best for those close to their goal weight or concerned about muscle loss.
Est. rate: ~0.1–0.2 kg/week
Steady, comfortable pace. Good balance of sustainability and results.
Est. rate: ~0.2–0.3 kg/week
The most commonly recommended range for healthy weight loss. Still allows adequate nutrition.
Est. rate: ~0.3–0.5 kg/week
Faster progress but requires discipline and careful attention to protein intake to protect muscle mass.
Est. rate: ~0.4–0.7 kg/week
These are general estimates. Real weight change depends on many factors including water retention, hormones, and metabolic adaptation.
How many calories to lose 1kg a week?
About 7,700 kcal is a commonly used planning estimate for 1 kg of body fat. Losing 1 kg in seven days would imply a deficit of roughly 1,100 kcal per day, which is too aggressive for many people. A 500 to 700 kcal daily deficit is usually more sustainable and should be adjusted using real weight trends.
How the Calculation Works
1. Calculate your TDEE (BMR × activity multiplier)
2. Apply your chosen deficit percentage: Daily Target = TDEE × (1 − deficit%)
3. Your weekly deficit = Daily Deficit × 7
Example: TDEE of 2,500 kcal with 20% deficit → Daily Target = 2,500 × 0.80 = 2,000 kcal/day
How the Calculation Works
Asterisks Fit calorie deficit thresholds are formulated based on clinical metabolic studies and evidence-based nutrition science:
- Academy of Nutrition and Dietetics Guidelines: Recommends a structured, moderate deficit of 10% to 25% of TDEE to achieve safe, sustainable weight loss (approximately 0.25 to 1.0 kg per week) while preserving lean skeletal muscle tissue.
- Dynamic Metabolic Modeling (Hall et al., 2011):Acknowledges that weight loss is non-linear. Standard static calculations (e.g., Wishnofsky's 3,500 kcal per pound rule) serve as initial mathematical estimates, but real-world adaptations involve metabolic slowing (adaptive thermogenesis) as body mass decreases, highlighting the need for regular progress reviews.
- Nutritional Adequacy Thresholds: Our system enforces built-in safety baselines (e.g., not recommending targets below standard clinical floors of 1,200 kcal/day for females and 1,500 kcal/day for males unless supervised by a clinical dietitian) to prevent micronutrient deficiencies and metabolic dysfunction.
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Want a Deficit Plan That Is Sustainable?
Extreme deficits lead to burnout. Work with a coach to design calorie targets and macro splits that preserve muscle and keep energy high.
Related Reading
How to Lose Belly Fat: Science-Based Approach →
Belly fat is the most stubborn type of fat to lose. Here is a science-backed approach that actually works long-term.
Weight LossMindful Eating: The Secret to Weight Loss Without Dieting →
Most restrictive diets lead to rebound. Mindful eating is a sustainable alternative that changes your relationship with food.
Frequently Asked Questions
Medical Disclaimer: Calorie targets are estimates. Always eat enough to meet your nutritional needs. Do not follow extreme deficits without medical supervision. Full disclaimer →