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A 300 calorie surplus means eating 300 more calories than your body burns each day. For most men, this is a 11% surplus and results in approximately 0.6 lbs of weight gain per week. With consistent training, expect a muscle-to-fat ratio of 1.5:1 to 2:1. Your exact results depend on your TDEE and training consistency.
Last updated: February 8, 2026
The percentage surplus depends on your TDEE. Here is what a 300 calorie surplus represents for different TDEE values:
| Your TDEE | Percentage Surplus | Surplus Level | Difficulty | Weekly Change |
|---|---|---|---|---|
| 2,200 cal | 13.6% | Aggressive Gain | Hard | 0.6 lbs/week |
| 2,500 cal | 12% | Aggressive Gain | Hard | 0.6 lbs/week |
| 2,800 cal | 10.7% | Aggressive Gain | Hard | 0.6 lbs/week |
| 3,000 cal | 10% | Aggressive Gain | Hard | 0.6 lbs/week |
The same 300 calorie surplus has a different impact depending on your metabolic rate. Someone with a higher TDEE can handle this more easily than someone with a lower TDEE.
A 300 calorie surplus affects different people differently based on their TDEE. For someone with a 2632 calorie TDEE, this is a 11% surplus. For someone with a 3,000 calorie TDEE, it is only a 10% surplus. The percentage determines your muscle-to-fat gain ratio. Smaller percentages (5-8%) favor lean muscle gains. Larger percentages (10-12%) result in faster total weight gain but with more fat.
Your TDEE (Total Daily Energy Expenditure) is the number of calories your body burns in a day. It determines what a 300 calorie surplus actually means for you. Someone with a higher TDEE can handle a larger absolute calorie surplus without it being too aggressive. Someone with a lower TDEE needs to be more careful. Use FitCommit to calculate your exact TDEE based on your lean mass (measured via AI body scan) instead of relying on generic online calculators that only use weight and height.
Based on a 5'10", 180 lb man at moderate activity:
TDEE
2,624 cal
Percentage Surplus
11% Aggressive Gain
Daily Calories
2,924 cal
| Week | Weight | Body Fat % | Fat Mass | Lean Mass |
|---|---|---|---|---|
| Start | 180 lbs | 25% | 45 lbs | 135 lbs |
| Week 2 | 181.2 lbs | 25.1% | 45.4 lbs | 135.8 lbs |
| Week 4 | 182.4 lbs | 25.1% | 45.8 lbs | 136.6 lbs |
| Week 6 | 183.6 lbs | 25.2% | 46.3 lbs | 137.3 lbs |
| Week 8 | 184.8 lbs | 25.3% | 46.7 lbs | 138.1 lbs |
| Week 10 | 186 lbs | 25.3% | 47.1 lbs | 138.9 lbs |
For the reference man eating 2,924 calories per day:
2,924
Daily Calories
108g
Protein
405g
Carbs
97g
Fat
Men typically have higher TDEEs than women due to greater lean mass, which means a 300 calorie surplus represents a smaller percentage of their total expenditure. A 300 calorie surplus might be a 5-8% surplus for a 180 lb man but a 10-12% surplus for a 150 lb woman. Men also build muscle faster due to higher testosterone levels, resulting in better muscle-to-fat ratios at the same surplus percentage. Women can still build significant muscle with a 300 calorie surplus, but should expect slightly more fat gain relative to muscle compared to men.
Adjust your calorie target if weight gain is too fast or too slow. If you are gaining more than 0.8 lbs per week, reduce your surplus by 100-150 calories. If you are gaining less than 0.4 lbs per week, increase by 100-150 calories. Also adjust every 4-6 weeks as your TDEE increases with weight gain. What was a 300 calorie surplus at the start may need to increase to 400-500 calories to maintain the same rate of gain.
First, calculate your TDEE using a calculator or app. Then add 300 calories from your TDEE to get your daily calorie target. For example, if your TDEE is 2,500 calories, your target is 2800 calories per day. Use FitCommit to get your exact TDEE based on lean mass measured via AI body scan.
2-3 sessions of low-intensity cardio per week (20-30 minutes of walking, cycling, or swimming) is recommended during any bulk. Cardio supports heart health, nutrient partitioning, and appetite regulation without interfering with muscle growth.
You can maintain a moderate surplus like this for 8-12 weeks. Monitor your waist measurement and body fat percentage. Cut when you reach your target body fat or after 12 weeks, whichever comes first.
Focus on whole foods: lean protein (chicken, fish, eggs, tofu), complex carbs (rice, oats, potatoes, bread), healthy fats (nuts, avocado, olive oil), and plenty of vegetables. Hit your protein target first (135-180g), then fill the rest with carbs and fats based on your calorie target. Track everything in a calorie counting app to ensure you hit your 300 calorie surplus consistently.
Stop guessing your TDEE based on generic calculators. FitCommit calculates your exact metabolic rate using your lean mass measured via AI body scan from your phone camera. Get personalized calorie targets in 60 seconds. Free 7-day trial.
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