Enter Your Stats
Valid age required.
Required (3-8).
Required (0-11).
Required (50-700).
Your Maintenance Calories (TDEE)
0
Calories per day to maintain your current weight.
MUSCLE GAIN TOOL
Free Bulking & Surplus Calculator
Build Muscle, Not Fat.
Find the exact number of calories you need to eat to pack on muscle mass while minimizing unnecessary fat accumulation.
How Many Calories Should I Eat to Build Muscle?
To force the body to construct new muscle tissue, you must provide it with an excess of energy. This is known as a calorie surplus. However, more is not always better. You need to supply just enough extra energy to fuel muscle protein synthesis without overwhelming your body's storage capacity.
The Golden Rule: Calculate your TDEE, add 250-300 calories, and hit that target consistently while following a progressive overload training program. Weigh yourself weekly. If you are gaining 0.25 to 0.5 lbs per week, you are in the perfect bulking sweet spot.
Choosing Your Bulking Strategy
Stop guessing and stop eating everything in sight. Pick a calculated strategy that aligns with your current body fat percentage and long-term goals.
1. Maintenance Surplus (+150 Calories)
Also known as "maingaining" or body recomposition. You eat slightly above maintenance. Weight gain on the scale will be incredibly slow, making it hard to track, but you will stay very lean year-round. This is ideal for beginners who can leverage "newbie gains" or advanced lifters who refuse to put on fat.
2. Lean Bulk (+300 Calories) — Recommended
The industry gold standard. Adding roughly 300 calories to your TDEE provides your body with optimal energy to build muscle at its maximum biological rate. You will experience slow, steady weight gain (about 0.5 lbs per week) and minimal fat accumulation. This allows you to stay in a bulking phase for 6 to 9 months before needing a minor cut.
3. Dirty Bulk (+500 to +1000 Calories)
The old-school method of eating everything you can get your hands on. You will see rapid scale movement (1 to 2 lbs per week) and you will gain strength quickly. However, you cannot force-feed muscle growth. Once your body maxes out muscle synthesis, every remaining calorie is stored as fat. Avoid this unless you are severely underweight and struggling with appetite.
Frequently Asked Questions
Do I need to eat in a surplus on rest days?▼
Yes. Muscle is broken down in the gym, but it is built during recovery. Muscle protein synthesis remains elevated for 24 to 48 hours after a hard training session. If you drop your calories on rest days, you are starving your body of the energy it needs right when it's trying to repair and grow tissue. Keep your surplus consistent every day.
Why am I not gaining weight in a surplus?▼
If the scale hasn't moved for two straight weeks, you are not in a surplus. You are likely burning more calories than you think through NEAT (non-exercise activity thermogenesis) or your metabolism has adapted to the higher food intake. Add another 150-200 calories to your daily target and reassess next week.
How long should a bulk last?▼
A proper lean bulk should last anywhere from 16 weeks to 9 months. Building muscle is an incredibly slow biological process. Short bulks (4-8 weeks) do not give your body enough time to add meaningful tissue. Stay the course until your body fat percentage reaches a point where you feel uncomfortable (usually 18-20% for men, 26-28% for women), then transition to a cut.