📈 Bulking Calorie Calculator
Calories & macros for gaining muscle mass
Written by Albert Mateos · Founder & Editor
Last reviewed: May 2, 2026
How it works
Calculate your optimal calorie intake for a clean bulk. Get a personalized calorie surplus (300-500 kcal above TDEE) with macros optimized for maximum muscle gain with minimal fat. Includes lean bulk and aggressive bulk options.
How to Use This Calculator
- Enter your weight, height, age, and sex.
- Select your activity level to calculate TDEE.
- Choose a lean bulk (+10%) or aggressive bulk (+20%).
- Review your daily calorie surplus target.
Example
Inputs: 25-year-old male, 75 kg, 180 cm, moderately active, lean bulk
Result: TDEE: 2,800 kcal — Bulk target: 3,080 kcal (+280 kcal)
What it means: A 280 kcal surplus should yield ~0.25-0.35 kg per week — mostly muscle if paired with progressive resistance training.
Tips
- Aim for 0.25-0.5% of body weight gain per week — faster means mostly fat.
- A lean bulk (+10%) minimizes fat gain; 'dirty' bulks (+25%+) rarely add more muscle.
- Track weekly body weight averages, not daily fluctuations.
- Protein at 1.8-2.2 g/kg is non-negotiable for muscle-focused bulking.
Disclaimer: This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
Frequently Asked Questions
- How large should my calorie surplus be for bulking?
- A moderate surplus of 250-500 calories above your TDEE is recommended for most people to maximize muscle gain while minimizing fat accumulation. Beginners can get away with slightly larger surpluses (400-500 calories) since they build muscle faster. Advanced lifters should lean toward smaller surpluses (200-300 calories) because their rate of muscle gain is slower.
- What is the difference between a lean bulk and a dirty bulk?
- A lean bulk uses a controlled surplus of 200-350 calories with a focus on nutrient-dense foods, aiming to gain mostly muscle with minimal fat. A dirty bulk involves eating as much as possible with little regard for food quality, often resulting in faster weight gain but a much higher proportion of fat. Most fitness professionals recommend lean bulking for better long-term results.
- How much muscle can I realistically gain per month?
- Natural lifters can expect to gain roughly 1-2 pounds of muscle per month during their first year of serious training, tapering to 0.5-1 pound per month in the second year and even less beyond that. Genetics, training quality, nutrition, and sleep all influence the rate. Any weight gain significantly faster than these benchmarks likely includes a substantial proportion of fat and water.