Body Recomposition Calculator
Find your daily calorie and protein targets to lose fat and build muscle at the same time.
What is body recomposition?
Body recomposition — often shortened to "recomp" — refers to losing fat and building muscle at roughly the same time, rather than the traditional approach of alternating separate "bulking" and "cutting" phases. It's most achievable for people newer to structured resistance training, those returning to training after time off, or people carrying a higher body fat percentage, since these groups can more easily build muscle even without a large calorie surplus.
Why maintenance calories (not a big deficit or surplus) work best for recomp
Traditional wisdom says you need a calorie surplus to build muscle and a deficit to lose fat — but at or near maintenance calories, many people can do both simultaneously, especially with adequate protein and a solid resistance training program. This calculator estimates your Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor formula, then applies only a very slight deficit (about 100 calories below maintenance) rather than the larger 500+ calorie deficit used for pure fat loss, since a large deficit makes it much harder for the body to build new muscle tissue.
Protein and training are non-negotiable for recomp
Because you're not relying on a calorie surplus to drive muscle growth, protein intake becomes even more important during recomposition — this calculator targets around 1.0g of protein per lb of body weight, at the higher end of common recommendations, to support muscle preservation and growth. Consistent resistance training, ideally 3-5 times per week, is equally essential, since the muscle-building stimulus has to come from training rather than surplus calories. This tool provides a general estimate only and is not medical or nutritional advice; consult a registered dietitian or physician for a plan tailored to your health history.
Frequently Asked Questions
Can you really lose fat and build muscle at the same time?
Yes, especially for beginners, people returning to training after a break, or those with a higher body fat percentage. It's generally slower and more subtle than a dedicated bulk or cut, but it's a well-documented approach known as body recomposition.
Why does this calculator use only a small calorie deficit instead of a bigger one?
A large calorie deficit makes it very difficult for the body to build new muscle tissue, since muscle growth typically requires some available energy and nutrients. A very slight deficit (around 100 calories) allows for gradual fat loss while still leaving enough room for muscle-building processes to occur.
How important is protein intake for body recomposition?
Very important. Since you're not relying on a calorie surplus to fuel muscle growth, higher protein intake (this calculator targets about 1.0g per lb of body weight) helps preserve and build muscle tissue even while calories are close to maintenance.
Do I need to lift weights for body recomposition to work?
Yes — consistent resistance training, generally 3-5 times per week, provides the stimulus your muscles need to grow or be preserved. Without it, a small deficit will simply result in slow fat loss with no meaningful muscle gain.
How long does body recomposition take to show results?
Because the calorie deficit is small and muscle gain is gradual, visible changes on the scale can be slower than a dedicated cut. Many people track progress with photos, measurements, and how clothes fit rather than relying on the scale alone, since body composition can improve while total weight stays fairly stable.
Is body recomposition better than a traditional bulk-and-cut approach?
Not necessarily better, just different. Recomposition tends to work well for beginners and people with more fat to lose, while more advanced lifters often find dedicated bulking and cutting phases produce faster results once natural recomposition potential has been used up.
Should advanced lifters try body recomposition?
It's possible but generally slower for advanced lifters, since they've already captured most of the "easy" simultaneous fat loss and muscle gain that newer trainees experience. Many advanced lifters find dedicated bulk and cut phases more efficient at that stage.
Is this medical or nutritional advice?
No. This tool provides a general estimate based on commonly-cited body recomposition guidelines and is not medical or nutritional advice. Consult a registered dietitian, personal trainer, or physician for a plan tailored to your individual needs.