# Macros for Body Recomposition: How to Set Protein, Fat, and Carbs

> Learn how a macros calculator turns your TDEE and goal into three numbers. The protein floor is non-negotiable. Fat and carbs flex around training and preference.

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Guide · Body recomposition

A macros calculator turns a calorie target into a daily plan: protein, fat, and carbs. This guide explains which number carries the weight, which ones flex, and how to use the output day by day.

Updated September 2026

## What a macro target actually is

A macro target is three numbers, protein, fat, and carbs, that add up to a calorie target. The [macros calculator](https://www.recompai.com/tools/macros) takes your TDEE and goal, then splits the calorie budget into those three numbers. The calorie total drives the direction of bodyweight. The split decides how much of that change is composition.

Calories are the headline number. Macros decide whether the weight you lose is fat or muscle, and whether the weight you gain is muscle or fat. For body recomposition, the protein number does most of the work. Fat and carbs are the levers you flex around training, hunger, and preference.

## Why protein is the load-bearing macro

Progressive resistance training provides the muscle-building stimulus. Adequate protein supports it. Calories affect the balance between fat loss, growth and recovery; a deficit is one option, not a requirement.

The research range is 1.6 to 2.2 g per kg of bodyweight, with 2.0 to 2.4 g per kg of lean mass during an aggressive cut. The [macros calculator](https://www.recompai.com/tools/macros) lands you inside that range automatically. Hit the protein number first every day. Fat and carbs fill what is left.

- Protein

    20–30%
- Carbs

    5–10%
- Fat

    0–3%

0% share spent on digestion 32%

Not all calories cost the same to use. Your body spends 20 to 30 percent of protein's calories just digesting and processing it, against 5 to 10 percent for carbs and almost nothing for fat. A high-protein diet quietly hands back a slice of every meal, which is part of why protein is the macro you anchor first and never cut.

Thermic effect ranges from Westerterp, Nutr Metab (Lond) 2004. [View study](https://pubmed.ncbi.nlm.nih.gov/15507147/)

## How to use the calculator step by step

1.  1\. Start from your TDEE.

    Macros sit on top of a calorie target. If you do not have one yet, run the [TDEE calculator](https://www.recompai.com/tools/tdee) first. Maintenance calories are the input the macro split flexes around.

2.  2\. Pick the goal.

    Calorie intake can range from a slight surplus to a moderate deficit around estimated maintenance. Choose a starting point that supports training, then adjust using changes in waist, weight and strength over several weeks.

3.  3\. Lock in protein.

    1.6 to 2.2 g per kg of bodyweight, or 2.0 to 2.4 g per kg of lean mass if you have a body fat estimate from the [body fat calculator](https://www.recompai.com/tools/bodyfat). The [protein calculator](https://www.recompai.com/tools/protein) handles the conversion if you want to see the math.

4.  4\. Set the fat floor.

    Fat covers hormonal health. The floor is about 0.7 g per kg of bodyweight, or roughly 20 percent of calories. Below that, sleep and recovery start to drag. Above it, the choice is preference.

5.  5\. Fill the rest with carbs.

    Whatever calories remain after protein and fat become carbs. Keep at least about 50 g per day so training intensity holds. The carb number is the most flexible of the three.

Protein Fat Carbs

grams / day

- Cut

    1,815 kcal 170 55 160

- Recomp· your goal

    2,225 kcal 170 65 240

- Lean bulk

    2,590 kcal 170 70 320

Protein holds the line across all three goals. Fat sits near its hormonal-health floor. Carbs are the swing macro: they expand when calories rise and absorb the cut when calories fall. Recomp lives in the middle column, eating near maintenance with protein high.

## How the three numbers play together

The calorie target sets direction. Protein protects composition. Fat covers hormones. Carbs fuel training. Those four roles map cleanly onto the three macros, with calories sitting above as the constraint that ties them together.

Protein and the calorie total are the non-negotiables. The fat-versus-carb split is a preference dial. A higher-fat plan suits people who train less or feel better with steady energy. A higher-carb plan suits people who train hard or perform best with fuel around sessions. Both work if calories and protein are right.

The targets shift as bodyweight changes. Drop 5 kg and the protein floor drops with it. Gain weight and the calorie target rises with it. Recalculate macros every 4 to 6 weeks, or whenever bodyweight moves more than 3 to 4 kg from the last input.

## Common mistakes using a macros calculator

- Chasing the perfect split. 40/30/30, 50/25/25, keto, high-carb. None of these win once protein and calories are locked. Pick a fat-carb split you can hit consistently and stop optimizing the ratio.
- Treating protein as a maximum, not a floor. Going over the protein target is fine. Going under, especially in a deficit, is what costs you lean mass. Hit it first, every day, before counting the rest.
- Skipping the TDEE step. Macros without a calorie anchor are guesses. If you have not estimated maintenance from the [TDEE calculator](https://www.recompai.com/tools/tdee), the macro plan rides on assumed calories. Errors compound across the week.
- Forgetting that the calculator output has error bars. Calorie targets carry a typical 10 percent error from BMR estimation. Run the plan for 7 to 10 days, watch the weight trend, then adjust calories by 100 to 200 kcal a week while holding the protein floor constant.

## Once you have your macros, what to do with them

Three numbers and a calorie ceiling are the entire daily plan. Hit protein first. Stay close to the calorie total. Let fat and carbs flex around what the day looks like. The weekly weight trend, not any single day, tells you whether the plan is working.

The Recomp AI [macros calculator](https://www.recompai.com/tools/macros) returns your protein, fat, and carb targets in grams, plus the calorie total they add up to. From there, log a few representative days and the targets become muscle memory. The math is the easy part. The adherence is the work.

## Frequently asked questions

### How accurate is a macros calculator?

The split math is exact. The calorie target it sits on carries the usual 10 percent error from BMR and activity estimation. Use the calculator output as the starting line, then adjust calories from the weekly weight trend while holding the protein number constant.

### Do I really need to hit my macros exactly?

Hit protein within about 5 g. Stay within 100 to 150 kcal of the calorie total. The fat-versus-carb split can swing 20 g either way without breaking the plan. Precision matters most on protein and calories. Everything else is range, not target.

### What are the best macros for body recomposition?

Use estimated maintenance to choose a calorie target, pair it with progressive resistance training and aim for about 1.6 to 2.2 g of protein per kg of body weight daily. Protein needs vary, especially during a deficit. Review progress and recovery before adjusting calories.

### How often should I recalculate my macros?

Every 4 to 6 weeks, or whenever bodyweight moves more than 3 to 4 kg from the last input. Adaptation pulls the calorie target down as a cut deepens, and the protein floor scales with bodyweight, so the numbers drift over time.

## References

- [Murphy C, Koehler K. Energy deficiency impairs resistance training gains in lean mass but not strength: A meta-analysis and meta-regression. Scand J Med Sci Sports, 2022;32(1):125-137.](https://pubmed.ncbi.nlm.nih.gov/34623696/)
- [Antonio J, Ellerbroek A, et al. A high protein diet (3.4 g/kg/d) combined with a heavy resistance training program improves body composition in healthy trained men and women: a follow-up investigation. J Int Soc Sports Nutr, 2015;12:39.](https://doi.org/10.1186/s12970-015-0100-0)
- [Westerterp KR. Diet induced thermogenesis. Nutr Metab (Lond), 2004.](https://pubmed.ncbi.nlm.nih.gov/15507147/)

## Related calculators

[Macros calculator Three numbers from your TDEE and goal: protein, fat, carbs.](https://www.recompai.com/tools/macros)

[TDEE calculator Maintenance calories. The anchor the macro split flexes around.](https://www.recompai.com/tools/tdee)

[Protein calculator Isolates the load-bearing macro: grams per kg, scaled to your goal.](https://www.recompai.com/tools/protein)

[Body fat calculator Unlocks lean-mass-based protein and a deficit cap based on your body fat.](https://www.recompai.com/tools/bodyfat)

[How to use the TDEE calculator Turn the number into a body-recomposition calorie target and adjust it weekly from the weight trend.](https://www.recompai.com/resources/tdee-body-recomposition)

[Protein for body recomposition How much protein a day for recomposition, cutting and bulking, with a worked example.](https://www.recompai.com/resources/protein-recomposition)

[Body recomposition calculator Estimate maintenance, a calorie and protein target, and a 12-week fat and lean-mass projection. Results depend on the model assumptions and your response.](https://www.recompai.com/body-recomposition-calculator)

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