Enter your height, weight, age, gender, and activity level into the bulking calculator. The bulking calculator will display your total number of daily calories needed to gain weight.
Note: BMR is estimated using the Mifflin–St Jeor equation (adults). This calculator provides general educational estimates only and is not medical advice. If you’re under 18, pregnant/breastfeeding, have a medical condition, or have a history of eating-disorder symptoms, get personalized guidance from a clinician or registered dietitian; for most adults, gradual changes (about 0.5–1 lb/week) are typical and faster changes may be unsafe.
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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 vs Cutting
Cutting is the opposite of the bulking process described above. Cutting involves eating less than the daily caloric needs of your body in order to lose weight. Ideally, this is done while maintaining as much muscle as possible. This is a very hard thing to do. The calculator above can also help you determine your caloric needs for cutting as well as bulking.
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.
