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Last updated: February 9, 2026
See exactly how long each calorie deficit takes, what you will weigh at the end, and which plan is right for your goal. Based on real calorie math, not generic advice.
FitCommit offers 6 deficit levels, from a gentle 15% cut to an extreme 40% deficit. Each level includes a full breakdown of daily calories, weekly weight loss, macro splits, and muscle retention risk. Pick the level that matches your experience and timeline.
A light calorie change that feels easy to stick with day to day.
12+ weeks
A steady pace that balances progress with consistency.
8-12 weeks
A noticeable pace that works well for most people.
6-10 weeks
A larger calorie change for quicker progress that can feel more demanding.
4-6 weeks
A very challenging pace requiring strong structure and routine.
2-4 weeks
The fastest pace. Best used for short periods with planned breaks.
1-2 weeks
7 common body fat transitions for men. Each page shows timelines at all 6 deficit levels, the recommended approach, weekly projections, and plateau strategies.
5 common body fat transitions for women. Each page shows timelines at all 6 deficit levels, the recommended approach, weekly projections, and plateau strategies.
Most people succeed with a 20-25% deficit (Moderate to Effective). This balances fat loss with muscle retention. More aggressive deficits (30-40%) work for short bursts but increase muscle loss risk. Gentler deficits (15%) take longer but preserve muscle better.
A cutting phase typically lasts 6-16 weeks depending on deficit level and starting body fat. Aim to lose 0.5-1% body fat per week. Taking diet breaks every 8-12 weeks helps maintain metabolic rate and adherence.
Beginners and those returning after a break can build some muscle in a deficit. Experienced lifters typically maintain muscle rather than build new tissue. Prioritize protein (1g per lb lean mass), progressive overload, and adequate sleep to minimize muscle loss during cuts.
Start with your TDEE (Total Daily Energy Expenditure), then subtract your chosen deficit percentage. For example, a 2,500 TDEE with a 20% deficit is 2,000 calories per day. FitCommit calculates your TDEE from your body composition (lean mass), which is more accurate than formulas using only height, weight, and age.
Protein: 1g per lb lean mass (for muscle retention). Fat: 25-30% of calories (for hormones). Carbs: fill the rest (for training energy). Adjust based on training volume. Higher carbs support more intense workouts. Lower carbs may help some people feel fuller.
Visual reference for every body fat percentage for men and women
Deficit and surplus percentages with TDEE calculations
How many calories you need per day by age, gender, and activity
Timelines for losing 5 to 100 pounds at different deficit levels
Realistic timelines for any weight loss goal
High-protein meals and recipes organized by goal
AI body scan from your phone camera. Get your body fat percentage, daily calorie target, and a week-by-week projection in 60 seconds. No equipment. No gym. Free 1-month trial.
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