Muscle Gain: Calories & Macros
Eat in a modest surplus and train hard so the extra calories build muscle, not just fat.
Example TDEE
2,740 kcal
Target
3,240 kcal
Protein
160 g
The strategy for muscle gain
Muscle Gain comes down to one decision: how far to set your calories from maintenance. To muscle gain, add a surplus of about 500 calories above your TDEE. Anything more aggressive risks losing muscle (when cutting) or piling on fat (when bulking); anything too gentle and progress stalls. The sweet spot is a change you barely notice day to day but that adds up over weeks.
Macros do the fine-tuning. Protein stays high at around 2g per kilogram of body weight to protect or build muscle. Fat sits near 25% of calories to keep hormones healthy. Whatever calories are left go to carbohydrates, your main training fuel. In our worked example (a moderately active 30-year-old, 80 kg), that lands at 160g protein, 448g carbs and 90g fat on roughly 3,240 calories.
Get your own personal numbers by entering your details on the home page calculator, then track your weight trend and adjust every couple of weeks.
Why Muscle Gain might be right for you
Building muscle requires a calorie surplus, but 'surplus' doesn't mean 'eat everything that isn't nailed down.' A 300-500 calorie surplus with enough protein is the difference between gaining mostly muscle and gaining mostly regret. Your TDEE is the starting line — without it, you're just guessing.
Common mistakes people make
The dreamer bulk: eating 1000+ over maintenance because 'more food equals more muscle.' In reality, muscle protein synthesis has a hard ceiling per day, and everything beyond that goes straight to your love handles. Also: not actually tracking and assuming you're in a surplus when you've been at maintenance for 2 months.
A real example
Kevin wanted to bulk but refused to lose his abs in the process. He ate at a 350-calorie surplus with 170g protein, gained roughly 1.5 lbs a month for 8 months. His bench went from 185 to 225, deadlift added 90 lbs, and he put visible size on his shoulders and back. His waist measurement went up less than an inch. Proof that a slow bulk actually works.
Frequently asked questions
How many calories for muscle gain?
Start from your TDEE, then add a surplus of about 500 calories above your TDEE. In our example, a TDEE of 2,740 calories becomes a target of about 3,240 calories a day. Calculate your own TDEE on the home page first.
What macros work best for muscle gain?
For this goal we suggest about 2g of protein per kg of body weight, 25% of calories from fat, and the rest from carbs. In the example that's 160g protein, 448g carbs and 90g fat.
How fast will I see results with muscle gain?
Steady mass building. Progress is rarely linear — weigh in a few times a week, average it, and adjust calories every 2–4 weeks based on the trend rather than any single day.
How fast will I gain weight on muscle gain?
With a 500-calorie surplus, aim for about 1.0 lb per week. Faster than that and most of the extra weight will be fat, not muscle. A realistic lean bulk adds 1–2 lb of actual muscle per month — use the mirror and your gym performance as better gauges than the scale alone.
What if muscle gain isn't working for me?
First, audit your tracking — most people underestimate what they eat by 20–30% without realizing it. Weigh and log everything for one week to calibrate. Second, confirm you are using your real TDEE, not a generic number. If the scale has not moved in 3+ weeks despite honest tracking, adjust by 200–300 calories in the right direction and give it 2 more weeks before changing course again. Sleep, stress, and daily non-exercise movement (NEAT) also have a bigger impact than most people think — fix those before slashing calories further.
Should I change my macros when doing muscle gain?
Protein is the anchor — keep it at 2g per kg of body weight regardless of calorie adjustments. Fat should stay above about 25% of total calories to support hormone function. The main lever for adjusting your intake is carbohydrates: add or remove 50–100g of carbs to shift total calories without touching your protein and fat floors. For muscle gain, that means about 448g carbs at 3,240 calories — adjust from there based on your results.
How to combine muscle gain with exercise?
For muscle gain, resistance training is non-negotiable — train 3–5 times a week with progressive overload so the calorie surplus builds muscle, not just body fat. Limit cardio to 1–2 easy sessions a week for heart health; too much conditioning competes with recovery and the growth signal you are trying to send your body.