How to Set Your Macros for Your First Cut or Bulk
September 18, 2026
For a first cut (fat loss) or bulk (muscle gain), a reasonable starting split is roughly 30-35% protein, 35-40% carbs, and 25-30% fat for a cut, or 25-30% protein, 40-45% carbs, and 25-30% fat for a bulk — adjusted from there based on how your body actually responds over the following weeks.
Skip the math and get your answer instantly:
Open the Macro Calculator →Starting Splits by Goal
| Goal | Protein | Carbs | Fat |
|---|---|---|---|
| Cutting (fat loss) | 30-35% | 35-40% | 25-30% |
| Bulking (muscle gain) | 25-30% | 40-45% | 25-30% |
| Maintenance | 25-30% | 40-50% | 25-30% |
Why Protein Gets Prioritized on a Cut
Higher protein intake during a calorie deficit helps preserve muscle mass, so more of the weight lost comes from fat rather than lean tissue — this is why cutting splits typically push protein higher relative to a bulk or maintenance split, even though total calories are lower overall.
Adjusting Based on Real Results
Track your weight trend (not day-to-day fluctuation) over 2-3 weeks. If a cut isn't producing steady fat loss, reduce calories slightly (usually by trimming carbs or fat, keeping protein steady). If a bulk is adding weight too fast (mostly fat, not muscle), reduce calories slightly the same way. Macro percentages are a starting framework, not a fixed rule — the calorie trend over time matters more than hitting an exact percentage every day.
Frequently Asked Questions
What macro split is best for cutting?
A common starting point is roughly 30-35% protein, 35-40% carbs, and 25-30% fat, with protein kept relatively high to help preserve muscle during the calorie deficit.
What macro split is best for bulking?
A common starting point is roughly 25-30% protein, 40-45% carbs, and 25-30% fat, with slightly more carbs prioritized to support training performance and recovery during a calorie surplus.
Should protein grams change between a cut and a bulk?
Protein grams per pound of body weight generally stay similar or increase slightly during a cut (since it's protecting muscle in a deficit) — it's usually carbs and fat that get adjusted up or down to change total calories.
How do I know if my macro split is working?
Track body weight trend and, ideally, progress photos or measurements over 2-3 weeks — if you're not seeing the expected direction of change, adjust total calories (via carbs or fat) rather than switching macro ratios entirely.
Do I need to hit my macros exactly every day?
No — being consistently close over the course of a week matters far more than hitting an exact gram target on any single day.