Learning how to calculate your macros for cutting or bulking gives you complete control over your physique transformation. Total calories dictate whether you gain or lose scale weight. However, your macronutrients (protein, fat, and carbohydrates) determine whether that weight change comes from lean muscle or stored body fat.
Calculating your macros based on body weight ensures your diet meets your muscle and hormone needs. You can generate custom macro targets instantly using our free online macro calculator.
Setting Your Macros for Cutting or Bulking
Before setting macro grams, establish your total daily calorie budget:
- Cutting Phase (Fat Loss): Subtract 350 to 500 calories from your maintenance TDEE (Total Daily Energy Expenditure) to lose 0.7 to 1.0 pound of fat per week while protecting muscle.
- Bulking Phase (Lean Muscle Gain): Add 250 to 400 calories above maintenance TDEE to fuel muscle growth while keeping fat gain low.
For example, consider a lifter who weighs 175 lbs (79.4 kg) with a maintenance TDEE of 2,600 calories per day: • Cutting Intake Target: 2,100 calories per day (-500 calorie deficit). • Lean Bulking Intake Target: 2,900 calories per day (+300 calorie surplus).
Step-by-Step Bodyweight Macro Calculations
Once your calorie budget is set, calculate macro grams in order of physiological priority:
1. Step 1: Protein Allocation (4 calories per gram): • Cutting Target: 1.0 to 1.1 grams of protein per pound of body weight (protects muscle during a calorie deficit). • Bulking Target: 0.8 to 0.9 grams of protein per pound of body weight (fuels muscle building during a surplus).
2. Step 2: Dietary Fat Allocation (9 calories per gram): Healthy fats are essential for hormone production (like testosterone and estrogen). Set baseline fat at 0.35 to 0.40 grams per pound of body weight (typically 20% to 30% of total calories).
3. Step 3: Carbohydrate Allocation (4 calories per gram): Carbohydrates fuel muscle glycogen stores and high-intensity workout performance. Subtract protein calories and fat calories from total daily calories, and divide the remaining balance by 4.
Worked Example for 175 lb Lifter on a Cutting Diet (2,100 calorie budget): • Protein: 1.0 g/lb × 175 lbs = 175 g protein (700 calories). • Fat: 0.35 g/lb × 175 lbs = 61 g fat (549 calories). • Remaining Calorie Balance: 2,100 - (700 + 549) = 851 calories. • Carbohydrates: 851 calories ÷ 4 = 213 g carbohydrates per day.
You can calculate your bodyweight macro splits easily using our macro calculator and our specialized macros by bodyweight calculator. You can also plan your total calorie target using our daily calorie calculator.
Nutrient Timing Around Workouts
While total daily macros drive 80% to 90% of your results, timing your carbohydrates around workouts improves exercise performance:
- Pre-Workout Meal (1 to 2 hours before): Eat 30 to 50 grams of easy-to-digest carbs alongside 25 to 30 grams of protein to raise workout energy.
- Post-Workout Recovery (within 2 hours): Eat 40 to 60 grams of carbs to replenish depleted muscle glycogen stores and support recovery.
- Night-Time Casein Protein: Eat slow-digesting protein (like cottage cheese) before bed to supply amino acids overnight.
Simple Tips for Accurate Food Tracking
Accurate tracking keeps your macros on target:
- Weigh Foods Raw: Meats and grains change weight during cooking due to water loss or gain. Weighing foods raw ensures consistency.
- Track Fiber Subtractions (Net Carbs): Deducting insoluble fiber from total carbohydrates yields net carbs, which helps on low-carb diets.
- Log Cooking Oils and Sauces: Tablespoons of olive oil (120 calories, 14g fat) add up quickly if unlogged.
- Use a Digital Kitchen Scale: Measuring foods by weight in grams is far more accurate than using volume measuring cups.
- Plan Meals a Day in Advance: Logging your food targets into a tracking app the night before prevents accidental overeating.
Managing Refeed Days and Reverse Dieting
During long 12 to 16 week cutting phases, periodic diet adjustments maintain progress:
- 24-Hour Carbohydrate Refeed: Increase daily carbohydrates to maintenance levels once a week while keeping protein constant. This helps restore leptin (a satiety hormone) and eases mental fatigue.
- Post-Cut Reverse Dieting: When ending a cut, gradually add 100 calories per week until reaching maintenance. This allows your metabolism to adapt without rapid fat rebound.
Common Macro Mistakes to Avoid
Avoid these frequent nutrition mistakes:
- Copying Pro Bodybuilder Diets: Following macro plans for 220 lb athletes will lead to rapid fat gain if your baseline mass is 150 lbs.
- Ignoring Micronutrient Quality: Hitting macro targets using only processed bars leads to digestion issues and nutrient deficiencies.
- Changing Targets Too Often: Stick with your calculated macro split for at least 3 weeks before making adjustments.
This article is for educational purposes only and does not constitute medical advice. Always consult a qualified doctor or dietitian before starting aggressive dietary plans.
