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 uses 6 deficit levels, from a gentle 15% cut to an extreme 40% deficit. Each level trades speed against difficulty and muscle-retention risk. Pick the one that matches your experience and timeline, then run your own numbers in the calculator below.
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
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
Build muscle and lose fat at the same time
Realistic timelines for any weight loss goal
How long to go from X% to Y% body fat with timelines
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