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Lean Bulk Calorie & Macro Calculator

Achieve steady muscle gains with a controlled, clean surplus.

Enter Body Stats

Biological Sex
Optimal TargetMifflin-St Jeor Science Standard
2,855kcal / day

+10% clean surplus to maximize protein synthesis with minimal fat accumulation.

Daily Macronutrient Target

Protein
140g
560 kcal
Fats
79g
711 kcal
Carbs
396g
1584 kcal
Basal Metabolic Rate (BMR)
1674 kcal
Total Expenditure (TDEE)
2595 kcal
Science Backed

How This Calculation Works

Aggressive bulking leads to unwanted fat gain. A lean bulk maintains a 200–350 kcal surplus to maximize muscle synthesis while keeping body fat in check.

Dynamic High-Protein Ratio: Scaled specifically by bodyweight to prevent lean muscle cannibalization during caloric deficit phases.
Mifflin-St Jeor Accuracy: Internationally validated formula accounting for sex, height, weight, and specific activity factors.

Frequently Asked Questions

How big should my surplus be for a clean bulk?

Aim for a 5% to 10% surplus above maintenance (typically 200–300 kcal/day) for optimal gains with minimal fat gain.