How to calculate bulking/lean bulk macros (EN): bulking is the controlled muscle mass gain phase with moderate caloric surplus. The modern optimal strategy is lean bulk: moderate caloric surplus (+200/+350/+500 kcal/day) with protein 1.9 g/kg for muscle hypertrophy, fat 1.0 g/kg for hormonal optimization, high carbs from surplus for intense training energy and glycogen. The calculator implements Helms 2014 lean bulk standard (J Int Soc Sports Nutr 11:20) and Schoenfeld-Aragon-Slater 2019 on nutrient timing. Bulking must be controlled to avoid excessive fat gain (old 80s-90s dirty bulking now obsolete). Reference frameworks: NIH ODS Bethesda, USDA Dietary Guidelines for Americans 2020-2025, FDA, NHS UK, NICE, BNF, EFSA Parma;

AND Academy of Nutrition and Dietetics Chicago, ASPEN ESPEN, ACSM American College of Sports Medicine Indianapolis, NSCA National Strength and Conditioning Association Colorado Springs, NATA, ISSN International Society Sports Nutrition, NPC National Physique Committee Pittsburgh, IFBB, WNBF World Natural BodyBuilding Federation Cleveland Ohio, INBA, IFPA, USAW USA Weightlifting Colorado Springs, USAPL USA Powerlifting; USADA, WADA Montreal, USOC, NCAA Indianapolis, NFL Combine, NBA Draft Combine Chicago. Research labs: AUT University Auckland New Zealand Helms Lab, CUNY Queens College Schoenfeld Lab New York, McMaster University Phillips Lab Hamilton Canada, Pennington Biomedical Research Center Baton Rouge, AIS Australian Institute of Sport Slater Canberra; UK Loughborough University Sports Sciences, Liverpool John Moores University, University of Stirling.

Sports nutrition supplements industry: Optimum Nutrition Aurora IL Gold Standard 100% Whey, BSN, MuscleTech, Cellucor, Quest Nutrition El Segundo CA, Premier Protein, RXBAR, GNC, Vitamin Shoppe, Bodybuilding.com, Cytosport Muscle Milk, Dymatize, EAS Myoplex; gym chains Equinox, Life Time, Gold's Gym, 24 Hour Fitness, Planet Fitness; equipment Peloton New York, Life Fitness Rosemont IL, Hammer Strength, Eleiko, Rogue Fitness Columbus OH; food density: Tyson Foods, Smithfield, Hormel, Perdue, Dean Foods, Quaker Oats, Kellogg's, Post Foods, General Mills Cheerios, Quest Nutrition high-protein bars.

Helms 2014 lean bulk macro formula

Bulking calories = TDEE + surplus; moderate surplus +200/+350/+500 kcal/day for 0.5-1 lb/week gain (1 lb muscle = 2,200-3,500 kcal theoretical).

Protein 1.9 g/kg/day (Helms 2014 lean bulk; ISSN 2017 1.6-2.2 hypertrophy; Morton-Murphy-Stokes-Phillips BJSM 52:376 2018 plateau at 1.62 g/kg in trained subjects).

Fat 1.0 g/kg/day (Helms 2014 optimal for testosterone IGF-1 anabolism hormones; range 0.8-1.5 g/kg; prefer EVOO extra virgin olive oil, nuts, seeds, fatty fish EPA DHA, avocado).

Carbohydrates = (calories - protein_kcal - fat_kcal) / 4; varies 4-6 g/kg in moderate bulk, up to 8-10 g/kg in elite endurance or intense strength athletes; prefer low-medium GI carbs whole grains, basmati brown rice, oats, sweet potatoes, legumes, fruit.

Example male 75 kg TDEE 2600 surplus +350: cal=2950; P=1.9*75=143 g (572 kcal); F=1.0*75=75 g (675 kcal); C=(2950-572-675)/4=426 g (1704 kcal); ratio P/C/F = 19/58/23%.

Meal distribution: 4-5 meals 30-40 g protein every 3-4 hours (Schoenfeld-Aragon 2018 optimal MPS); peri-workout 30 g whey + 30-40 g carb pre/post training (Aragon-Schoenfeld 2013).

Muscle gain rate (Helms-Aragon-Schoenfeld 2014 + Slater 2019 AIS): novices 0.25-0.5%/week weight (= 1-2 kg/month, 2-4 lb), intermediates 0.1-0.2%/week (= 0.4-0.8 kg/month, 1-2 lb), advanced 0.05-0.1%/week (= 0.2-0.4 kg/month, 0.5-1 lb), elite plateau (Brad Schoenfeld McDonald curve), women 50-70% of men.

History bulking from 80s dirty bulk to Helms lean bulk 2014

In the 80s-90s dirty bulking was bodybuilder practice with 5000-8000 kcal/day aggressive surplus +1000/+2000 kcal accumulating 30-50% fat (Tom Platz, Lou Ferrigno, Markus Ruhl). Negative results: BF% +10-15% gain, gynecomastia, hypertension, dyslipidemia, reduced insulin sensitivity.

Eric Helms AUT University Auckland New Zealand 2014 (J Int Soc Sports Nutr 11:20) codified modern lean bulk: surplus +5-10% TDEE (200-500 kcal/day), protein 1.9 g/kg, fat 1 g/kg, carbs remainder, gain 0.25-0.5%/week novices and intermediates.

Brad Schoenfeld CUNY New York and Alan Aragon published influential 2013-2018 reviews on peri-workout nutrient timing, per-meal protein distribution, optimal hypertrophy surplus.

Greg Slater 2019 AIS Australian Institute of Sport characterized muscle gain rate: novices 1-2 kg/month, intermediates 0.4-0.8 kg/month, advanced 0.2-0.4 kg/month, elite plateau.

Lyle McDonald popularized the muscle gain curve with plateau after 5-10 years natural training.

Lou Schuler-Aragon wrote bestseller The Lean Muscle Diet 2014.

Volume Hypertrophy Schoenfeld 2017 meta-analysis Med Sci Sports Exerc 49:765 recommends 10-20 sets/week per muscle group for optimal hypertrophy. In USA WNBF World Natural Bodybuilding Federation Cleveland Ohio, NPC Pittsburgh, INBA, IFPA tested federations promote lean bulking with FFMI 25 natural cap (Kouri-Pope 1995 McLean Hospital Belmont MA Harvard).

Bulking macros table by body weight

5 numerical bulking examples

Example 1 male 75 kg TDEE 2600 surplus +350 lean bulk: cal 2950; P 143 g; F 75 g; C 426 g; ratio 19/58/23. WNBF NPC natural bodybuilder profile; gain 0.25-0.4 kg/week intermediate.

Example 2 intermediate athlete 80 kg TDEE 2800 surplus +500 aggressive bulk: cal 3300; P 152 g; F 80 g; C 555 g; ratio 18/67/22. USAPL 83 kg category powerlifter profile; gain 0.5 kg/week with more fat.

Example 3 novice 70 kg TDEE 2400 surplus +200 lean bulk minimal: cal 2600; P 133 g; F 70 g; C 384 g; ratio 20/59/24. First 6-12 months gym profile; gain 1-2 kg/month (0.25-0.5%/week weight Slater 2019 AIS).

Example 4 advanced natural athlete 85 kg TDEE 2900 surplus +200: cal 3100; P 162 g; F 85 g; C 425 g; ratio 21/55/25. NPC advanced 5+ years profile; gain 0.1-0.2%/week (0.3-0.7 kg/month); McDonald curve plateau Schoenfeld 2017.

Example 5 endurance athlete bulking 65 kg TDEE 2500 surplus +200: cal 2700; P 124 g; F 65 g; C 421 g; ratio 18/62/20. NCAA Division I marathoner profile; higher carbs for endurance glycogen + minimal surplus to avoid weight gain.

Bulking model limitations

Muscle gain rate physiologically limited (Helms-Aragon-Schoenfeld 2014, Slater 2019 AIS): novices 1-2 kg/month, intermediates 0.4-0.8 kg/month, advanced 0.2-0.4 kg/month, elite plateau (McDonald curve). Surplus >500 kcal/day produces excess fat without additional muscle gain (Iraki 2019 dose-response Sports analysis).

Genetics: maximum natural FFMI variability 22-25 (Kouri-Pope 1995 limit, Hubbard 2010 outliers up to 28).

Sex differences: women gain 50-70% of men's muscle (10-20x lower baseline testosterone).

Age: anabolic resistance over 50 yrs requires more pronounced surplus and protein 30-40 g per meal (vs 20 g youth).

Body Recomposition (recomp): losing fat + gaining muscle at constant weight only possible in novices, returners, obese BMI >30, athletes on high protein 2.2-2.4 g/kg with optimal training stimulus (Barakat 2020 Sports).

Muscle plateau: after 3-5 years intense training gain slows <0.1%/week; periodization, deload weeks, exercise variation needed.

Body composition measurements monthly: BIA InBody Tanita SECA, skinfold Durnin-Womersley 4-site, BodPod, DEXA gold standard; weekly progress photos for composition tracking.

Competitive athletes: advanced Helms 2014 protocols with peri-workout nutrition 30 g whey + 30-40 g carbs, creatine monohydrate 5 g/day loading 20 g/day x 5 days then 3-5 g/day maintenance (gold standard ergogenic ISSN 2017).

Common bulking errors

Common errors: excessive dirty bulking >+1000 kcal/day (Tom Platz 80s era now obsolete; excess fat, gynecomastia, dyslipidemia, reduced insulin sensitivity); excessive protein >2.5 g/kg in bulk (above 1.62 g/kg MPS plateau Morton-Phillips 2018); fat too low <0.7 g/kg (hormonal compromise even in bulk); expecting linear muscle gain (5-10% weekly weight is water/glycogen variation); excessive volume training >25 sets/week/muscle group (over-reaching, increased cortisol, reduced MPS); ignoring peri-workout carb timing (30-40 g pre/post training improves performance and MPS Aragon-Schoenfeld 2013); not monitoring body composition (BF% weekly progress to avoid excess fat gain >2% per month); excessive cardio in bulking (reduces effective surplus); supplements before basic nutrition (food first; creatine #1 effective ergogenic ISSN 2017); dirty bulking pre-vacation (cortisol stress + alcohol sabotages composition); confusing bulking with recomp (recomp only novices/returners; lean bulk minimal surplus for intermediates-advanced).

Bulking applications USA UK

1. Natural bodybuilding: WNBF World Natural Bodybuilding Federation Cleveland Ohio, INBA International Natural BodyBuilding Association, IFPA International Federation Physique Athletes, NPC National Physique Committee Pittsburgh; UK BNBF British Natural Bodybuilding Federation; tested FFMI 25 natural cap reference Kouri-Pope 1995 Harvard McLean.
2. Strength sports: USAW USA Weightlifting Colorado Springs, USAPL USA Powerlifting, USA Wrestling, USA Boxing, USA Judo; NCAA Indianapolis collegiate; UFC weight cut MMA combat sports.
3. Sports nutrition supplements: Optimum Nutrition Aurora IL Gold Standard whey, BSN, MuscleTech, Cellucor, Quest Nutrition El Segundo CA, Premier Protein, Cytosport Muscle Milk, Dymatize, EAS Myoplex; gym chains Equinox Life Time Gold's Gym 24 Hour Fitness Planet Fitness; equipment Peloton Life Fitness Rosemont IL Hammer Strength Eleiko Rogue Fitness Columbus OH.
4. Anti-doping: USADA US Anti-Doping Agency Colorado Springs, WADA World Anti-Doping Agency Montreal, UKAD UK Anti-Doping London; ABP Athlete Biological Passport; WADA Code Prohibited List S1 anabolic agents; FFMI 25 natural cap screening anthropometric.
5. Food density: Tyson Foods Springdale AR, Smithfield, Hormel, Perdue, Pilgrim's Pride poultry beef; Dean Foods Dairy Farmers of America milk; Quaker Oats General Mills Cheerios Kellogg's Post Foods grains; Quest Nutrition high-protein bars; California Milk Got Milk campaign; National Cattlemen's Beef Association.

Updated July 2026