Macro Calculator: Your Ideal Protein, Carbs & Fat Split
For a 170 lb male eating 2,300 calories/day for fat loss, a balanced macro split (30/40/30) is: 173g protein (690 cal), 230g carbs (920 cal), 77g fat (690 cal). For high-protein dieting: 230g protein, 201g carbs, 64g fat. Protein should be 0.7-1.0g per pound of body weight during a deficit.
Calculate Your Macros
Get your protein, carb, and fat targets.
Macro Breakdown
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Macro Split Presets
| Diet Style | Protein | Carbs | Fat | Best For |
|---|---|---|---|---|
| Balanced | 30% | 40% | 30% | General health, maintenance |
| High Protein | 40% | 35% | 25% | Fat loss with muscle preservation |
| Low Carb | 40% | 20% | 40% | Fat loss, blood sugar management |
| Keto | 25% | 5% | 70% | Ketogenic diet adherents |
| Zone (40/30/30) | 30% | 40% | 30% | Athletic performance |
Calorie Content per Gram
- Protein: 4 calories per gram
- Carbohydrates: 4 calories per gram
- Fat: 9 calories per gram
- Alcohol: 7 calories per gram (not a macronutrient, but contributes calories)
How to Hit Your Macros
Protein sources (per 100g): Chicken breast 31g, Greek yogurt 10g, eggs 13g, salmon 20g, tofu 8g, lentils 9g.
The protein priority rule: Most people undershoot protein. Aim for 0.7-1.0g per pound of body weight when in a calorie deficit, and 0.8-1.2g when building muscle. Hitting your protein target matters more than perfectly splitting carbs and fat — those two are somewhat interchangeable for body composition purposes.
Tracking tip: Use a food tracking app for 2-4 weeks to calibrate your intuition, then transition to mindful eating with periodic check-ins.
1. Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. The National Academies Press. 2005. doi:10.17226/10490
2. Jager R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition Position Stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20. doi:10.1186/s12970-017-0177-8
3. U.S. Department of Agriculture. Dietary Guidelines for Americans, 2020-2025. USDA. https://www.dietaryguidelines.gov/
Frequently Asked Questions
What are macros?
Macros (macronutrients) are the three main nutrients your body needs in large amounts: protein (4 cal/g), carbohydrates (4 cal/g), and fat (9 cal/g). Together, they account for all the calories in your food. Tracking macros means ensuring you eat specific gram amounts of each to optimize for your health and fitness goals.
What is the best macro ratio for weight loss?
For weight loss, a high-protein ratio like 40% protein, 30% carbs, 30% fat works well because protein preserves lean muscle, increases satiety, and has a higher thermic effect (your body burns 20-30% of protein calories during digestion vs 5-10% for carbs and 0-3% for fat). The total calorie deficit matters more than the exact ratio.
How much protein do I need per day?
The RDA is 0.36g per pound of body weight (0.8g/kg), but this is the minimum to prevent deficiency. For active individuals and anyone dieting, research supports 0.7-1.0g per pound (1.6-2.2g/kg) for optimal muscle preservation and satiety. A 2018 meta-analysis in the British Journal of Sports Medicine found benefits up to 1.6g/kg, with diminishing returns beyond.
Do I need to track macros to lose weight?
No. Weight loss requires a calorie deficit, which you can achieve without tracking macros. However, tracking macros helps ensure adequate protein intake (protecting muscle mass), prevents nutritional imbalances, and gives you more control over body composition. Many people find 2-4 weeks of macro tracking educational, even if they don't continue long-term.
What happens if I eat too much protein?
For healthy adults, high protein intake (up to 1.5g per pound of body weight) has not been shown to cause kidney damage or other health problems in research studies. A 2016 study by Antonio et al. found no adverse effects from 1.5g/lb consumed for one year. However, people with pre-existing kidney disease should consult their doctor about protein limits.
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