Find your ideal daily calorie target to reach your goal weight safely — calculate by deficit size or by timeline.
300–500 kcal is a safe, sustainable range for most people
| Daily Deficit | Weekly Loss | Sustainability |
|---|---|---|
| 200 kcal | ~0.18 kg | Very conservative — ideal for slow recomp |
| 350 kcal | ~0.32 kg | Mild — easy to maintain, minimal muscle loss |
| 500 kcal | ~0.45 kg | Moderate — recommended sweet spot |
| 750 kcal | ~0.68 kg | Aggressive — requires careful diet planning |
| 1,000 kcal | ~0.91 kg | Very aggressive — professional guidance advised |
A calorie deficit occurs when you consume fewer calories than your body burns in a day (your TDEE). Since body fat stores roughly 7,700 kcal per kilogram, consistently eating below your TDEE forces your body to burn stored fat for energy, resulting in weight loss over time.
A moderate deficit of 300–500 kcal/day is considered optimal for most people. This typically produces 0.3–0.5 kg of fat loss per week while preserving muscle mass. Larger deficits can accelerate loss but increase muscle breakdown, hunger, fatigue, and the risk of nutritional deficiencies.
Only up to a point. Very large deficits (>1,000 kcal/day) trigger metabolic adaptation — your body reduces BMR, increases hunger hormones, and breaks down muscle for fuel. The practical result is that weight loss slows, compliance drops, and the weight often returns rapidly after dieting ends.
Most health authorities recommend losing no more than 0.5–1 kg (1–2 lbs) per week. Faster loss is associated with greater muscle loss and nutrient deficiencies. A minimum intake of 1,200 kcal/day for women and 1,500 kcal/day for men is widely used as a safety floor below which professional supervision is recommended.
Send your active calories, total calories, and weight data to Home Assistant, n8n, or any webhook endpoint — automatically, in the background.
