Can I gain only pure muscle without fat?
Some minor fat gain usually accompanies a calorie surplus, but keeping the surplus conservative (200-300 kcal/day) keeps gains mostly lean.
Weight Gain Calculator
Calculates projected timelines and recommended daily caloric surpluses for healthy, lean weight gain and muscle hypertrophy.
Scientific Formula & Exercise Physiology Standards
Equation: Lean Hypertrophy Timeline Equation | Peer-Reviewed Source: Helms et al. (2014) The Muscle and Strength Pyramid
Weeks to Goal = Total Weight to Gain (kg) ÷ Weekly Gain Rate (kg)
Maps realistic weight gain rates of 0.25 kg (0.5 lb) to 0.5 kg (1 lb) per week to maximize muscle protein synthesis and minimize unnecessary adipose storage.
Step-by-Step Worked Example: Target Weight Gain (68 kg up to 74 kg)
- Total gain needed: 74 - 68 = 6 kg (13.2 lbs)
- Weeks required: 6 kg ÷ 0.25 kg/wk = 24 weeks
- Daily surplus: (0.25 × 7700) ÷ 7 = 275 kcal/day (Target: 2,575 kcal/day)
Calculation Result: Timeline: 24 weeks (Target daily intake: 2,575 kcal/day)
Clinical Nuances, Limitations & Best Practices
- Gaining weight too rapidly (> 1 lb/week for non-beginners) typically results in higher proportions of fat tissue.
Frequently Asked Questions (Weight Gain Calculator)
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