Estimate maintenance calories and a gradual calorie surplus for athletic mass gain. Use the dedicated Athlete Cutting Calculator for a deficit.
Watch the full explainer with transcript and worked examples.
What is Bulking?
Bulking is a term used in the fitness community to describe the process of intentional weight gain, often with the goal of gaining as much muscle as possible. Bulking typically involves eating in a calorie surplus (more energy than your body needs). A surplus can support weight gain, but building muscle also requires consistent resistance training and adequate protein, and some weight gain may be body fat and water.
As a planning shortcut, people sometimes estimate that about 3,500 calories is roughly equivalent to 1 lb of body weight change. In practice, real-world weight change varies (fat, muscle, glycogen, and water), so use this as a starting estimate, monitor progress, and adjust your daily surplus/deficit as needed.
Bulking versus maintenance
This calculator covers maintenance and gradual surplus planning. Use the Athlete Cutting Calculator for a deficit.
Bulking Tips
The following is a list of tips you should follow for a successful bulk.
- Don't eat as much as possible. You will gain too much excess weight as fat, and it will be hard to lose when you're done bulking. Only eat enough to gain a steady amount.
- Eat healthy while bulking. Increase your caloric intake with healthy foods. Bulking on junk food will lead to more fat gain than muscle gain.
- Track your progress as you go along and adjust your calories as needed. Don't stick to something that's not working, adjust constantly.
- Long bulks can increase fat gain and slow progress; consider reassessing every 4–12 weeks based on trends in body weight, performance, and how you feel.
