Calorie Deficit & Weight Loss Planner
Calculate your exact daily calorie budget to reach your target weight by your deadline safely and sustainably.
Goal & Weight Timeline
Define your starting weight, target goal, and deadline.
Eat this amount daily to hit your goal on schedule.
Weekly Weight Loss Forecast Table
Projected weight trajectory over your 12-week timeline.
| Timeline | Projected Weight | Cumulative Loss |
|---|---|---|
| W1Week 1 | 77.2 kg | -0.8 kg |
| W2Week 2 | 76.3 kg | -1.7 kg |
| W3Week 3 | 75.5 kg | -2.5 kg |
| W4Week 4 | 74.7 kg | -3.3 kg |
| W5Week 5 | 73.8 kg | -4.2 kg |
| W6Week 6 | 73 kg | -5 kg |
| W7Week 7 | 72.2 kg | -5.8 kg |
| W8Week 8 | 71.3 kg | -6.7 kg |
| W9Week 9 | 70.5 kg | -7.5 kg |
| W10Week 10 | 69.7 kg | -8.3 kg |
| W11Week 11 | 68.8 kg | -9.2 kg |
| W12Week 12 | 68 kg | -10 kg |
How Calorie Deficit Creates Fat Loss
Bottom Line: A calorie deficit occurs when your total energy expenditure exceeds your calorie intake. Because 1 kg of human adipose tissue holds roughly 7,700 kcal (3,500 kcal per pound), creating a calibrated daily deficit enables predictable, healthy fat reduction.
Weight loss is fundamentally governed by the First Law of Thermodynamics: consuming fewer calories than your Total Daily Energy Expenditure (TDEE) forces your body to oxidize stored adipose tissue (body fat) and glycogen to satisfy energetic demands.
Calorie Deficit Magnitudes, Fat Loss Rates & Lean Mass Preservation
Comparing deficit magnitudes to balance fat oxidation speed against metabolic adaptation and hormonal health:
| Deficit Strategy | Daily Calorie Cut | Weekly Weight Loss | Muscle Retention & Sustainability |
|---|---|---|---|
| Mild Deficit (10–15%) | 250 – 350 kcal/day | 0.5 lbs / 0.25 kg | Optimal (99%+ muscle preserved; zero diet fatigue) |
| Moderate Deficit (20–25%) | 500 – 750 kcal/day | 1.0 – 1.5 lbs / 0.5 – 0.7 kg | Gold Standard (High fat loss with strength retention) |
| Aggressive Deficit (30–35%) | 1,000+ kcal/day | 2.0+ lbs / 1.0 kg | Moderate risk of muscle catabolism and metabolic slowdown |
Golden Rules for a Safe Calorie Deficit
Keep your daily deficit between 300 and 750 calories. Maintain high protein intake (1.6–2.2g per kg of body weight) and perform resistance training to preserve lean muscle mass.