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Body Recomposition Calculator
Body recomposition means losing fat and building muscle at the same time. This calculator sets your calories at 0 to 10 percent below maintenance based on training experience, anchors protein at 2.2 grams per kilogram of lean mass, and shows realistic monthly muscle gain expectations.
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Learn how this works
How Body Recomposition Works
How losing fat and gaining muscle at once works, the calorie and protein targets that support it, and who recomposes fastest.
Read the guideKey facts about body recomposition
- Recomposition works best at maintenance calories or a small deficit of 0 to 10 percent below TDEE.
- The protein target for recomposition is about 2.2 grams per kilogram of lean body mass per day.
- Realistic monthly muscle gain is roughly 1.0 to 1.5 lb for beginners, 0.5 to 1.0 lb for intermediates, and 0.25 to 0.5 lb for advanced lifters.
- Visible recomposition typically takes 8 to 12 weeks, with meaningful change over 6 months or more.
How does body recomposition work?
Body recomposition means changing your ratio of muscle to fat while your total weight barely moves. Instead of a big cut or a big bulk, you eat close to maintenance, push protein high, and train with progressive resistance. Your body pulls energy from fat stores to help build and repair muscle, so the scale stays roughly flat while your shape and strength improve. Because weight changes little, the mirror, the tape, and your lifts track progress better than the scale.
How this calculator sets your targets
First it estimates your maintenance calories from the Mifflin-St Jeor equation (1990) and your activity, the same as the TDEE calculator and documented on our methodology page. Then it sets calories at maintenance or slightly below, from 0 to 10 percent depending on your experience level, so there is a small nudge toward fat loss while still leaving enough energy to build muscle. Protein is set to about 2.2 grams per kilogram of lean mass, the priority nutrient for recomposition. Finally it gives a realistic range for monthly muscle gain based on how long you have trained.
| Experience | Calorie target | Muscle gain / month |
|---|---|---|
| Beginner (under 1 year) | 5% below TDEE | 1.0 to 1.5 lb |
| Intermediate (1 to 3 years) | 7.5% below TDEE | 0.5 to 1.0 lb |
| Advanced (3+ years) | 10% below TDEE | 0.25 to 0.5 lb |
Worked example
An intermediate lifter, 78 kg, 178 cm, 28 years old, training moderately, has a maintenance near 2700 calories. The calculator sets a target about 7.5 percent below that, roughly 2500 calories, with a protein goal near 172 grams. It suggests a realistic gain of about half a kilogram of muscle per month, reminding them that recomposition is a months-long project rather than a quick transformation.
Who recomposes fastest?
Beginners, people returning after time off, and those carrying more body fat respond most strongly, because untrained muscle grows quickly and higher fat stores supply plenty of energy. Advanced lifters can still recompose but far more slowly, and often do better alternating focused cutting and gaining phases. Whatever your level, protein is non-negotiable: confirm your target with the protein calculator, set your full split with the macro calculator, and track lean mass over time with the FFMI calculator.
When is recomp the wrong strategy?
If you have a lot of fat to lose and want the fastest health improvement, a conventional deficit from the calorie deficit calculator moves the scale faster. If you are already very lean and want maximum muscle, a dedicated surplus phase works better than hovering at maintenance. Recomp shines in the middle: reasonably trained or returning lifters who want steady visual change without weight swings. Patience is the real skill; give the plan two to three months and judge it by measurements and photos rather than daily weigh-ins.
Limitations of this calculator
Recomposition estimates rest on an approximate maintenance figure and on muscle-gain rates that vary widely with genetics, training quality, sleep, and how new you are to lifting. The monthly muscle ranges are realistic averages, not guarantees, and progress is rarely linear. The tool cannot measure body composition; it assumes healthy adults and does not replace guidance for medical conditions or for the very lean or very heavy, who may do better with a dedicated cut or bulk. Track measurements and photos, not just the scale.
Sources and references
- Longland TM, et al. Higher compared with lower dietary protein during an energy deficit combined with intense exercise. Am J Clin Nutr. 2016. PubMed 26817506
- Barakat C, et al. Body recomposition: can trained individuals build muscle and lose fat at the same time? Strength Cond J. 2020. journals.lww.com
- Helms ER, Aragon AA, Fitschen PJ. Evidence-based recommendations for natural bodybuilding. J Int Soc Sports Nutr. 2014. PubMed 24864135
Calorie and protein logic is documented on the methodology page.
Frequently asked questions
What is body recomposition?
Losing fat and building muscle at the same time, so weight may barely change while your shape improves. It works best near maintenance calories with high protein and progressive resistance training. Measurements and photos track it better than the scale.
Who can recomp successfully?
Beginners, people returning after a break, and those with higher body fat recomp fastest because their muscles respond strongly to training. Advanced lifters can still recomp, but slowly. The tool adjusts expectations by experience level.
What calorie target should I use?
Maintenance or a very small deficit, roughly 0 to 10 percent below TDEE. A tiny deficit nudges fat loss while enough energy and protein still support muscle growth. The result sets this automatically.
How much protein do I need to recomp?
About 2.2 grams per kilogram of lean body mass, spread across the day. High protein preserves and builds muscle even when overall calories are modest. It is the single most important dietary lever for recomposition.
How long does body recomposition take?
Think months, not weeks. Visible change often takes 8 to 12 weeks and meaningful recomposition 6 months or more. Consistency with training and protein produces the result.