🔄 Body Recomposition Calculator
Build muscle and lose fat simultaneously
Written by Albert Mateos · Founder & Editor
Last reviewed: May 2, 2026
How it works
Build muscle and lose fat at the same time. Calculate your optimal calories for training days vs rest days, get macro recommendations optimized for body recomposition, and estimate your progress timeline. Based on the latest sports nutrition research.
How to Use This Calculator
- Enter your age, sex, height, weight, and activity level.
- Select your training frequency and experience level.
- Review the recommended calorie intake for training and rest days.
- Note the protein target, which stays high to support muscle growth.
- Track body composition monthly rather than daily scale weight.
Example
Inputs: 28-year-old male, 180 cm, 82 kg, trains 4 days per week, intermediate lifter.
Result: Training days 2,700 kcal, rest days 2,300 kcal, daily protein 190 g.
What it means: The calorie-cycling approach provides fuel on training days to drive muscle gain while keeping a modest deficit on rest days to drive fat loss.
Tips
- Body recomposition works best for beginners, returning lifters, and those over 20% body fat. Advanced lifters with low body fat face diminishing returns.
- Expect slow visible progress, typically 0.25-0.5 kg of lean mass gained per month and similar fat loss. Photos beat scale weight for tracking.
- Protein at 2.2-2.6 g/kg is non-negotiable. This is the single biggest lever for simultaneous muscle gain and fat loss.
- Progressive overload in training matters more than ever. Small weekly strength gains confirm you're still building muscle despite the mild deficit.
- Reassess every 6-8 weeks. If neither body fat nor strength is moving, pick a direction (cut or bulk) for 8-12 weeks instead.
Disclaimer: This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
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Frequently Asked Questions
- Can I really build muscle and lose fat at the same time?
- Yes, especially if you're a beginner, returning after a break, or carrying significant body fat. It's slower than dedicated bulking or cutting, but research shows it's possible with adequate protein (2.0-2.4g/kg), calorie cycling, and progressive resistance training.
- How long does body recomposition take?
- Expect visible changes in 8-12 weeks with consistent training and nutrition. The scale may not change much since you're gaining muscle while losing fat. Track progress with measurements, photos, and strength gains rather than just weight.