Complete Guide: Lean Body Mass Calculator for Bodybuilders
Track your lean mass throughout bulking and cutting. Ensure you're gaining muscle in surplus and retaining it in deficit.
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Expert Tips for Bodybuilders
- ✓Use FFMI to compare your muscle development to genetic potential
- ✓Natural FFMI limit is approximately 25 for men, 22 for women
- ✓Track LBM weekly during prep to ensure muscle retention
- ✓Off-season: if LBM isn't increasing, you're spinning your wheels
- ✓During cutting, LBM loss is inevitable - minimize it with high protein
- ✓Multiple measurement methods together give the best picture
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Frequently Asked Questions
What FFMI can natural bodybuilders achieve?
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FFMI 22-25 for men is achievable naturally with years of training. Above 25 is rare without assistance. Women: 18-22 range.
How do I maintain LBM during a cut?
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High protein (1.2-1.5g/lb), maintain training intensity, moderate deficit (500-750 cal), adequate sleep, and potential diet breaks.
How much LBM should I expect to lose during prep?
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A good prep loses minimal LBM - maybe 1-3 lbs over 16 weeks. Losing more suggests diet is too aggressive or protein too low.
What's more important - LBM or body fat percentage?
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Both matter. High LBM creates the muscular base; low body fat reveals it. Track both throughout your bodybuilding journey.
How accurate are LBM calculations?
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Navy method is within 3-5% for most. For bodybuilders, calipers or DEXA are more useful. Track trends rather than obsessing over exact numbers.
Looking for the standard lean body mass calculator?
Go to Main Lean Body Mass Calculator