Macronutrients
Protein Calculator
Estimate daily protein intake for muscle protein synthesis, fat loss, and lean mass retention. Based on ISSN guidelines: 1.6-2.2 g/kg body weight adjusted by goal. Higher end (2.2 g/kg) recommended during calorie deficit to prevent muscle catabolism.
System Units
Awaiting Calculator Inputs
Fill in the fields above and hit Calculate to generate your body composition targets.
Formula & Math
Uses a practical range around 1.6-2.2 g/kg body weight, adjusted conservatively by goal.
How to Interpret
The result is a daily range, not a single mandatory number. Consistency matters more than precision.
Plan Integration
Take these estimations back to the main Strategy Finder assessment, or save them in your tracking logs in the local dashboard.
Protein Nutrition: Building Blocks of Lean Mass
Science & physiological analysis for strategy selection
Reviewed by Divy Yadav, CSCS
Last updated: June 27, 2026 · BodyCompOS Editorial Board
Dietary protein is the critical regulator of muscle protein synthesis and lean body mass preservation. When calories are restricted, the body utilizes amino acids for energy; if protein intake is insufficient, muscle tissue is broken down to meet this demand. Conversely, during a calorie surplus, adequate protein provides the raw materials required for muscle hypertrophy. The BodyCompOS Protein Calculator calculates daily protein targets based on ISSN guidelines, scaling ranges from 1.6 to 2.2 grams per kilogram of body weight depending on your strategy direction and training experience.
1. How to Use & Apply This Target
Target the middle of your recommended range for general muscle maintenance. During an active calorie deficit (cutting), lean toward the higher end of the range (2.2 g/kg or 1.0 g/lb) to prevent lean mass loss and enhance satiety. For muscle building in a surplus, the middle to lower-middle range (1.6 to 2.0 g/kg) is highly effective, as the caloric surplus itself is protein-sparing. Distribute this intake across 3 to 5 meals throughout the day.
2. Mathematical Assumptions & Formula Logic
Protein ranges are calculated based on total body weight in kilograms. The baseline range is set between 1.6 g/kg (the minimum threshold for maximizing resistance training adaptations in clinical literature) and 2.2 g/kg (the practical upper limit of benefit for natural athletes). During cutting or recomposition, the range is shifted slightly higher to prioritize muscle preservation.
3. Step-by-Step Worked Mathematical Example
Frequently Asked Questions
Q:Will eating excess protein damage my kidneys?
In healthy individuals with no pre-existing kidney disease, clinical research has repeatedly shown that high protein diets (even up to 3.3 g/kg of body weight) do not cause adverse effects on renal function. Ensure you maintain adequate hydration to assist in clearing nitrogenous waste products.
Q:What is the best timing for protein intake?
While total daily protein intake is the most important factor, research suggests distributing protein into doses of 0.4 to 0.55 g/kg per meal (about 30-45g for most individuals) every 3 to 5 hours. This strategy keeps muscle protein synthesis elevated throughout the day, rather than consuming the majority of your protein in a single meal.
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Calculate calorie and protein targets for simultaneous fat loss and muscle gain. Near-maintenance calories (2% deficit) with higher protein emphasis (2.2 g/kg). Recomp progress is slower; judge results beyond scale weight using body composition trends.