Calculate your optimal calories and macros for body recomposition. Get personalized training day and rest day nutrition targets to build muscle while losing fat.
Calorie Cycling Strategy
Training days (4x/week): 2,436 cal
Rest days (3x/week): 1,906 cal
Weekly balance: +634.189 calories vs maintenance
These are estimates. Adjust based on your actual progress over 2-4 weeks.
Body recomposition (often called "recomp") is the process of simultaneously losing body fat and building muscle mass. Unlike traditional approaches that cycle between bulking (gaining weight to build muscle) and cutting (losing weight to shed fat), recomposition aims to achieve both goals at the same time.
The concept challenges the conventional wisdom that you must be in a caloric surplus to build muscle or a deficit to lose fat. Research has shown that with the right combination of nutrition, resistance training, and recovery, your body can use stored fat as fuel for muscle growth while maintaining or slightly adjusting your overall calorie intake.
Body recomposition is particularly effective for beginners, those returning to training after a break, people who are overweight with untrained muscles, and even experienced lifters under the right conditions. The key is providing your muscles with adequate protein and training stimulus while creating conditions that allow fat to be mobilized for energy.
The traditional view of metabolism suggests that muscle building requires excess calories (anabolic state) while fat loss requires a calorie deficit (catabolic state). These seem mutually exclusive, but the reality is more nuanced.
Your body doesn't operate in a single metabolic state 24/7. Throughout each day, you cycle between anabolic and catabolic phases based on meals, exercise, and hormonal fluctuations. Body recomposition leverages this by strategically timing nutrition around workouts:
This approach, called calorie cycling, creates the metabolic conditions for simultaneous fat loss and muscle gain without the dramatic weight swings of traditional bulk/cut cycles.
This calculator uses established formulas to estimate your calorie and macronutrient needs for body recomposition.
Your BMR is the calories burned at complete rest. The calculator uses one of two formulas:
Mifflin-St Jeor equation (when body fat is unknown):
Katch-McArdle formula (when body fat is provided):
The Katch-McArdle formula is more accurate for muscular individuals or those who know their body fat percentage, as it accounts for your actual lean mass rather than estimating from height and weight.
TDEE accounts for your daily activity:
| Activity level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.2 | Desk job, little exercise |
| Lightly active | 1.375 | Light exercise 1-3 days/week |
| Moderately active | 1.55 | Moderate exercise 3-5 days/week |
| Very active | 1.725 | Hard exercise 6-7 days/week |
Based on your goal, the calculator applies different adjustments to training and rest days:
| Goal | Training day | Rest day | Weekly effect |
|---|---|---|---|
| More muscle gain | +20% | -5% | Slight surplus |
| Balanced | +15% | -10% | Near maintenance |
| More fat loss | +10% | -15% | Slight deficit |
Protein is calculated based on body weight and your selected protein level:
| Protein level | Amount | Best for |
|---|---|---|
| Standard | 0.8 g/lb | Maintenance, moderate activity |
| High | 1.0 g/lb | Active training, body recomp |
| Plant-based | 0.65 g/lb | Vegan/vegetarian athletes |
Fat is set at 30% of daily calories (essential for hormone production), and remaining calories come from carbohydrates.
Body recomposition works for most people, but certain groups see particularly strong results:
Those new to resistance training experience "newbie gains" - a period where the body rapidly adapts to novel training stimulus. During this phase, muscle growth occurs more easily even in a calorie deficit, making body recomposition highly effective.
If you've taken time off from training, muscle memory allows faster muscle regain than initial building. Your body retains the neural pathways and cellular machinery for muscle growth, accelerating recomposition when you return.
People carrying excess body fat have substantial energy reserves that can fuel muscle growth. Research shows overweight individuals can build muscle while in a significant calorie deficit, as long as protein intake and training stimulus are adequate.
While harder than for beginners, experienced lifters can still achieve body recomposition with precise nutrition timing, higher protein intake, and periodized training. The rate of change is slower but still meaningful over time.
Body recomposition requires consistent resistance training - not just cardio. Your workouts should:
Without adequate training stimulus, extra protein simply gets oxidized for energy rather than building muscle.
While total daily protein is most important, distributing intake across 3-5 meals helps maximize muscle protein synthesis. Aim for 25-40g of protein per meal, especially:
Sleep deprivation significantly impairs body recomposition. One study found that sleep-restricted individuals lost more muscle and less fat compared to well-rested participants eating identical calories. Aim for 7-9 hours nightly to optimize:
Body recomposition often shows minimal scale weight change because you're simultaneously gaining muscle and losing fat. This can be frustrating if you're focused on the number on the scale.
Better progress markers include:
Many people underestimate their protein needs during recomposition. Unlike a traditional bulk where excess calories provide a buffer, recomp requires protein to do more work - building muscle while preventing breakdown during rest-day deficits.
Extreme deficits don't accelerate fat loss - they impair muscle retention and recovery. Keep rest-day deficits moderate (10-15% below maintenance) to preserve training performance and muscle mass.
Sporadic workouts prevent the consistent stimulus needed for muscle adaptation. Aim for at least 3-4 resistance training sessions weekly, maintained over months rather than weeks.
Training breaks down muscle; recovery builds it. Overtraining without adequate rest, sleep, and nutrition undermines recomposition efforts regardless of how perfect your macros are.
Body recomposition is a slower process than aggressive cutting or bulking. Realistic expectations are 0.5-1 lb of muscle gain and 0.5-1 lb of fat loss per month for intermediate lifters, with beginners potentially seeing faster results.
The calculator provides starting estimates. After 2-4 weeks, assess your progress:
| Factor | Body recomp | Bulk/Cut |
|---|---|---|
| Rate of muscle gain | Slower | Faster during bulk |
| Rate of fat loss | Moderate | Faster during cut |
| Aesthetic consistency | Maintained | Fluctuates significantly |
| Sustainability | Higher | Can be mentally taxing |
| Complexity | Moderate | Lower (one goal at a time) |
| Best for | Beginners, returners, maintenance | Competitive bodybuilders |
Body recomposition is ideal for those who want to improve their physique without dramatic weight fluctuations or the psychological challenges of extended bulking and cutting phases.
This calculator provides estimates based on population averages and established formulas. Individual variation means your actual needs may differ by 10-20%. Consider these factors:
Use these numbers as a starting point and adjust based on real-world results over 3-4 weeks.
Plan your meals around your training schedule. On training days, place more carbohydrates around your workout (pre and post). On rest days, slightly reduce carbs while keeping protein and fat consistent.
At least initially, track your food intake to ensure you're hitting targets. After a few weeks, you'll develop an intuitive sense of portions, but periodic check-ins help prevent drift.
While whole foods should form the foundation, some supplements can support recomposition:
Avoid relying on fat burners or "anabolic" supplements with unproven claims.
Rest-day deficits may increase hunger. Strategies to manage this include: