Body Recomposition Calculator
Estimate goal weight, calorie targets, fat loss pace, and macro guidance for a body recomposition phase.
Reviewed for accuracy by Rahul Singh, Health & Wellness Specialist
Medical disclaimer: This calculator is provided for educational and informational purposes only and does not constitute medical advice, diagnosis, or treatment. Results are general estimates and may not reflect your individual circumstances. Always consult a qualified healthcare professional before making decisions about your health.
Body Recomposition Calculator
Calculator
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Formula: Goal Weight = Lean Mass / (1 - Goal BF%)
Worked example — Goal weight: 159 lbs | Daily target: 2,050 cal | Protein: 135g
Formula
Goal Weight = Lean Mass / (1 - Goal BF%)
First, calculate current lean mass: Weight × (1 - Body Fat%). Then find goal weight by dividing lean mass by (1 - goal BF%). The difference is fat to lose. Daily deficit = (fat to lose × 3,500) / (weeks × 7). Protein is set at 1g per pound of lean mass for muscle preservation.
Worked Examples
Example 1: Standard Male Recomp
Problem:180-lb male at 25% body fat wants to reach 15% body fat in 16 weeks.
Solution:Current lean mass: 180 × 0.75 = 135 lbs Current fat mass: 180 × 0.25 = 45 lbs Goal weight (maintaining lean mass): 135 / 0.85 = 158.8 lbs Fat to lose: 180 - 158.8 = 21.2 lbs Weekly loss: 21.2 / 16 = 1.3 lbs/week Daily deficit: 1.3 × 3,500 / 7 = 650 cal/day Target calories: 2,700 - 650 = 2,050 cal Protein: 135g | Fat: 57g | Carbs: 222g
Result:Goal weight: 159 lbs | Daily target: 2,050 cal | Protein: 135g
Example 2: Conservative Female Recomp
Problem:145-lb female at 30% body fat wants to reach 22% in 20 weeks.
Solution:Current lean mass: 145 × 0.70 = 101.5 lbs Current fat mass: 145 × 0.30 = 43.5 lbs Goal weight: 101.5 / 0.78 = 130.1 lbs Fat to lose: 145 - 130.1 = 14.9 lbs Weekly loss: 14.9 / 20 = 0.7 lbs/week Daily deficit: 0.7 × 500 = 350 cal/day Target calories: 2,175 - 350 = 1,825 cal
Result:Goal weight: 130 lbs | Daily target: 1,825 cal | Protein: 102g
Example 3: Standard male recomp example
Problem:A 180 lb male at 25 percent body fat wants to reach 15 percent body fat in 16 weeks.
Solution:Current lean mass is about 135 lbs and fat mass is about 45 lbs. Keeping lean mass constant, the projected goal weight is about 159 lbs. That means losing about 21 lbs of fat over 16 weeks, or about 1.3 lbs per week.
Result:Goal weight: about 159 lbs | Daily target: about 2,050 cal | Protein: about 135 g
Frequently Asked Questions
What is body recomposition?
Body recomposition (or 'recomp') is the process of simultaneously losing fat and maintaining (or even building) muscle. Unlike traditional bulking and cutting cycles, recomposition aims to improve your body composition without dramatic weight changes. The scale might not move much, but your body shape changes significantly. Recomp works best for beginners (who can build muscle in a deficit), people returning to training after a break, and those with higher body fat percentages. It requires a moderate calorie deficit, high protein intake, and progressive resistance training.
How much protein do I need for body recomposition?
For body recomposition, protein needs are higher than general guidelines. Research supports 0.8-1.2g of protein per pound of lean body mass (not total weight) for optimal muscle preservation during a calorie deficit. Body Recomposition Calculator uses 1g per pound of lean mass as a target. For a 180-lb person at 25% body fat, that's about 135g of protein daily. Higher protein intake increases satiety (you feel full longer), preserves muscle during fat loss, has a high thermic effect (your body burns more calories digesting protein), and supports workout recovery.
How fast should I lose body fat?
For optimal muscle preservation, aim to lose 0.5-1% of your body weight per week, which translates to roughly 0.5-1.5 lbs per week for most people. Losing faster than this significantly increases the risk of muscle loss. For leaner individuals (below 15% body fat), a slower rate of 0.5 lb/week is recommended. Those with higher body fat (above 25%) can sustain slightly faster loss (1-1.5 lbs/week) without as much muscle risk. If the calculator shows your plan requires more than 1.5 lbs/week, consider extending your timeframe.
Should I bulk or recomp?
If you're above 20% body fat (men) or 30% (women), recomp or a cut is usually better — you'll improve insulin sensitivity and nutrient partitioning by getting leaner first. If you're below 12% (men) or 20% (women) and want to build muscle, a lean bulk (small surplus of 200-300 cal) is more efficient. The sweet spot for recomposition is 15-25% body fat for men and 22-32% for women. Beginners and those returning from a training break benefit most from recomp because they can build muscle even in a deficit (the 'newbie gains' effect).
Why is the scale weight not changing during body recomp?
This is completely normal and actually a sign that recomposition is working. When you lose 1 lb of fat and gain 1 lb of muscle, the scale reads the same — but you look dramatically different because muscle is denser than fat. A pound of muscle takes up about 18% less space than a pound of fat. Instead of tracking scale weight alone, measure progress through: body measurements (waist, chest, arms), progress photos every 2-4 weeks, how clothes fit, strength gains in the gym, and body fat percentage measurements. The mirror and measuring tape tell a more accurate story than the scale.
What is body composition and why is it better than BMI alone?
Body composition describes what your body is actually made of: skeletal muscle, fat mass, bone mineral density, and water. Unlike BMI — which divides weight by height squared and cannot distinguish a pound of muscle from a pound of fat — body composition identifies whether weight is metabolically active tissue or stored energy. Healthy body fat percentages vary by sex and age: for women, 20-32% is generally considered healthy; for men, 8-19%. Measurement methods include DEXA scans (most accurate, ±1-2%), hydrostatic weighing, Bod Pod air displacement, bioelectrical impedance (consumer scales, ±3-5%), and skinfold calipers. A muscular person with a BMI of 27 (overweight) might have excellent body composition, while a sedentary person with a normal BMI could have metabolically risky visceral fat levels.
References
Reviewed for accuracy by Rahul Singh, Health & Wellness Specialist · Editorial policy
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