IRONCOMPARE

BODY RECOMPOSITION CALCULATOR

Calculate your target weight, daily calorie intake, and macro breakdown for body recomposition. Lose fat and retain muscle with a personalized plan based on your body composition and activity level.

CALCULATE YOUR RECOMP PLAN

WHAT IS BODY RECOMPOSITION?

Body recomposition is the process of simultaneously losing body fat and building or preserving lean muscle mass. Unlike traditional approaches that cycle between bulking (gaining weight to build muscle) and cutting (losing weight to shed fat), recomposition aims to reshape your body composition without dramatic swings in bodyweight.

The concept is straightforward: eat in a slight calorie deficit while training hard and consuming enough protein to stimulate muscle growth. Your body uses stored fat for the energy gap while directing dietary protein toward muscle repair and synthesis. The result is a leaner, more muscular physique at a similar or slightly lower bodyweight.

HOW THIS CALCULATOR WORKS

This calculator uses the Katch-McArdle formula to estimate your Basal Metabolic Rate based on lean body mass. Unlike formulas that rely on total bodyweight, Katch-McArdle accounts for your body composition, producing a more accurate calorie estimate for people who know their body fat percentage.

The formula is: BMR = 370 + (21.6 × lean mass in kg). Your BMR is then multiplied by an activity factor to determine maintenance calories. The recomp calorie target is set at approximately 275 calories below maintenance — a mild deficit that supports fat loss while preserving the energy needed for muscle protein synthesis.

SETTING UP YOUR RECOMP DIET

A successful recomp diet prioritizes protein above all else. Aim for approximately 1g of protein per pound of lean body mass (about 2.2g per kg). This level of protein intake maximizes muscle protein synthesis, protects existing muscle during a deficit, and increases satiety to help you stay on track.

Dietary fat should be kept at approximately 0.8g per kg of bodyweight to support hormone production and overall health. The remaining calories are allocated to carbohydrates, which fuel your training and support recovery. On training days, you may benefit from shifting more calories toward carbohydrates around your workouts.

MACROS FOR RECOMPOSITION

The macro split for body recomposition differs from typical fat loss or muscle gain phases because it must serve both goals simultaneously. Protein is the anchor — it is set first and takes priority over carbohydrates and fat.

  • Protein: ~1g per pound of lean mass (2.2g/kg). The most critical macro for recomp. Higher intake supports muscle building and retention during a deficit.
  • Fat: ~0.8g per kg of bodyweight. Supports testosterone production, joint health, and satiety. Do not drop fat below 0.5g/kg.
  • Carbohydrates: Remaining calories after protein and fat are accounted for. Carbs fuel your training — higher carb intake typically improves gym performance and recovery.

REALISTIC TIMELINE EXPECTATIONS

Body recomposition is inherently slower than dedicated bulking or cutting cycles. You are attempting to move two variables in opposite directions simultaneously, which requires precision and patience. Expect visible changes after 8–12 weeks of consistent adherence.

The scale may not move much during a recomp phase because fat loss and muscle gain can offset each other on the scale. Instead, track progress through body measurements, progress photos, strength gains in the gym, and how your clothes fit. These indicators are far more reliable than bodyweight alone during a recomposition phase.

FREQUENTLY ASKED QUESTIONS

What is body recomposition?
Body recomposition — often called recomp — is the process of losing body fat and gaining or preserving muscle simultaneously. Unlike traditional bulking and cutting cycles, recomposition aims to change your body composition without dramatic weight swings. It is best suited for beginners, people returning to training after a break, and those carrying moderate body fat who want to improve their physique without extreme dieting.
Can you really lose fat and build muscle at the same time?
Yes, but the rate depends on your training experience. Beginners and those with higher body fat percentages can build muscle and lose fat simultaneously because they have more room for adaptation. Advanced lifters with low body fat find it much harder. Research consistently shows that a slight calorie deficit combined with high protein intake and resistance training can produce meaningful recomposition, especially in the first 1-2 years of serious training.
How many calories should I eat for body recomposition?
Body recomposition typically works best at a mild calorie deficit — roughly 200-300 calories below your maintenance level. This small deficit provides enough energy for muscle protein synthesis while still creating conditions for fat loss. Eating at maintenance or even a very slight surplus can also work for beginners, but a small deficit accelerates fat loss without meaningfully impairing muscle growth for most people.
How important is protein for recomposition?
Protein is the single most important macronutrient for body recomposition. Research suggests consuming 0.8-1g per pound of lean body mass (approximately 2.2g per kg of lean mass) to maximize muscle protein synthesis and recovery. High protein intake also preserves muscle during a calorie deficit and increases satiety, making it easier to adhere to your calorie target.
How long does body recomposition take?
Body recomposition is a slow process — significantly slower than dedicated bulking or cutting phases. Most people notice visible changes after 8-12 weeks of consistent training and nutrition. Dropping 5% body fat while maintaining or gaining lean mass can take 3-6 months depending on your starting point, training experience, and adherence. The trade-off is a more sustainable, enjoyable process with fewer extreme dietary phases.
Should I do cardio during a body recomposition?
Moderate cardio (2-4 sessions per week of 20-30 minutes) supports recomposition by increasing calorie expenditure and improving cardiovascular health without interfering with recovery. However, resistance training should be your primary focus — it is the main driver of muscle growth and metabolic adaptation. Avoid excessive cardio, as it can increase cortisol, impair recovery, and make it harder to build or retain muscle mass.
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