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Body Recomposition Calculator

Body recomposition — losing fat while simultaneously gaining muscle — is one of the most sought-after outcomes in fitness. Unlike traditional bulk/cut cycles, recomposition uses calorie cycling to create a modest surplus on training days (to support muscle growth) and a moderate deficit on rest days (to encourage fat loss). Progress is slower than a dedicated bulk or cut, but you maintain aesthetic progress throughout and avoid major weight swings.

Reviewed by GetHealthyCalculators Editorial Team · Updated April 14, 2026

Quick Answer

For body recomp, eat at TDEE +200 kcal on training days and TDEE −300 kcal on rest days. Aim for 0.7–1.0 g of protein per pound of bodyweight daily.

These results are estimates based on general formulas and are not a substitute for professional medical advice. Consult a healthcare provider before making health decisions.

Enter your details to calculate your recomposition targets.

How the Formula Works

  1. Calculate your TDEE using the Mifflin-St Jeor equation and activity multiplier.

    TDEE = BMR × Activity Multiplier

  2. Set a slight caloric surplus on training days to fuel muscle protein synthesis.

    Training Day = TDEE + 200 kcal

  3. Set a moderate deficit on rest days to encourage fat oxidation.

    Rest Day = TDEE − 300 kcal

  4. Calculate weekly average calories and estimated fat loss from the net weekly deficit.

    Weekly Average = (4 × Training + 3 × Rest) / 7 | Fat Loss = Weekly Deficit / 3500

Methodology & Sources

Reviewed and updated April 14, 2026 · Prepared by GetHealthyCalculators Editorial Team

Calorie cycling values are informed by research-backed thresholds: small surpluses (~100–300 kcal) appear sufficient for muscle-protein synthesis without excess fat gain, while modest deficits (~200–500 kcal) support fat loss without degrading recovery (Helms et al., J Int Soc Sports Nutr 2014; Slater et al., Front Nutr 2019). Protein targets reflect the upper of Morton et al. (BJSM 2018) meta-analysis ceilings at ~1.6–2.2 g/kg/day (roughly 0.7–1.0 g/lb). Simultaneous muscle gain and fat loss (Barakat et al., Strength Cond J 2020) is most pronounced in novice trainees, those returning from a layoff, or those with significant fat reserves — not advanced, lean lifters.

References

  • Evidence-based recommendations for natural bodybuilding contest preparation: nutrition and supplementation (Helms ER et al., J Int Soc Sports Nutr 2014;11:20) · Journal of the International Society of Sports Nutrition
  • Body Recomposition: Can Trained Individuals Build Muscle and Lose Fat at the Same Time? (Barakat C et al., Strength Cond J 2020;42:7–21) · Strength and Conditioning Journal
  • A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength (Morton RW et al., Br J Sports Med 2018;52:376–384) · British Journal of Sports Medicine
  • Is an energy surplus required to maximize skeletal muscle hypertrophy associated with resistance training? (Slater GJ et al., Front Nutr 2019;6:131) · Frontiers in Nutrition
  • Hypertrophy — The Mechanisms of Muscle Growth and the Effect of Different Training Variables (Schoenfeld BJ, J Strength Cond Res 2010;24:2857–2872) · Journal of Strength and Conditioning Research
  • Protein timing and its effects on muscular hypertrophy and strength in individuals engaged in weight-training (Schoenfeld BJ, Aragon AA, J Int Soc Sports Nutr 2018;15:10) · Journal of the International Society of Sports Nutrition
  • Effects of different protein intakes on body composition and muscle strength (Antonio J et al., J Int Soc Sports Nutr 2015;12:39) · Journal of the International Society of Sports Nutrition

Limitations

  • This calculator uses estimated TDEE, which may differ from your actual energy expenditure by 10–20%.
  • Body recomposition is a slow process — meaningful changes typically require 3–6 months of consistent training and nutrition, and individual response varies widely.
  • The formula does not account for training experience — advanced, lean athletes may struggle to gain muscle in any deficit and often do better with traditional bulk/cut phases.
  • Estimated weekly fat loss assumes all deficit comes from fat; in practice, some comes from glycogen and water, so early "loss" is partially non-fat.
  • Calorie targets assume honest food tracking. Most adults under-report intake by 20–40% (Trabulsi & Schoeller, Am J Physiol 2001), which is a common reason recomp stalls.
  • This tool is not a substitute for individualized coaching or medical advice. Consult a registered dietitian, physician, or sports-nutrition specialist, especially if you have a history of disordered eating, a chronic condition, or are pregnant or breastfeeding.

Frequently Asked Questions

What is body recomposition?
Body recomposition refers to simultaneously reducing body fat and increasing lean muscle mass. Instead of gaining weight to build muscle (bulk) and then dieting to lose fat (cut), recomposition aims to do both at once through calorie cycling and high protein intake.
Is body recomposition possible for everyone?
It is most effective for beginners who have not trained seriously before, individuals returning from a long break, or those with significant fat reserves. Advanced, lean athletes with years of training will find simultaneous muscle gain and fat loss increasingly difficult and may benefit more from traditional bulk/cut phases.
Why is protein so important for body recomposition?
Protein provides the amino acids needed for muscle protein synthesis (MPS) — the process of building new muscle tissue. A high protein intake (0.7–1.0 g per lb of bodyweight) also helps preserve lean mass during the caloric deficit on rest days and has the highest thermic effect of any macronutrient, meaning more of its calories are burned during digestion.
How does calorie cycling work for body recomp?
On training days, a small caloric surplus provides energy and nutrients for muscle repair and growth. On rest days, a moderate deficit puts the body in fat-burning mode without undermining recovery. The net weekly deficit is typically small enough to prevent muscle loss while still driving fat reduction over time.
How long does body recomposition take?
Most people can expect to notice measurable changes in body composition after 8–12 weeks of consistent training and adherence to calorie targets. Significant recomposition usually takes 6–12 months. Progress is assessed better by measuring body fat percentage and muscle circumference than by scale weight alone.
How should I track progress during recomp?
Because scale weight can stay flat while composition shifts, layered measurements work best: weekly average morning weight, monthly tape measurements (waist, hips, arms, thighs), progress photos under consistent lighting, training logs, and occasionally a DXA or BIA scan every 3–6 months.
What training approach supports recomp best?
Progressive overload with 10–20 working sets per muscle group per week (Schoenfeld, JSCR 2010) within moderate rep ranges (6–15) produces reliable hypertrophy. Pair 3–5 resistance sessions per week with some zone-2 cardio for cardiovascular health — avoid excessive cardio that competes with recovery.
Can women do body recomposition the same way?
Yes — the principles of modest calorie cycling, adequate protein, and progressive overload apply identically. Women may benefit from slightly smaller surpluses (~100–150 kcal), attention to menstrual cycle phase for hard training days, and vigilance around signs of RED-S (relative energy deficiency in sport).
When should I consult a professional about my recomp plan?
Consult a registered dietitian, certified coach, or physician if you have a history of disordered eating, a chronic condition (diabetes, thyroid disease, CKD), are pregnant or breastfeeding, are recovering from an injury, or stall for more than 8–12 weeks despite consistent effort.

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