What are macros (macronutrients)?

Macronutrients are the three main nutrients your body uses for energy: protein (4 cal/g), carbohydrates (4 cal/g), and fat (9 cal/g). Tracking macros gives more precision than calorie counting alone because it ensures you're getting the right fuel for your specific goal - not just the right amount of calories.

How many grams of protein do I need per day?

For most people with fitness goals, 0.7–1.0g of protein per pound of bodyweight (1.6–2.2g/kg) is the evidence-based sweet spot. Research shows muscle protein synthesis plateaus around 1.6g/kg, with some benefit up to 2.2g/kg for those in a significant calorie deficit or doing very high training volumes.

What's the difference between Balanced, Low Carb, High Protein, and Keto?

Balanced (30/40/30) is the most sustainable all-around split. Low Carb (35/25/40) reduces insulin spikes and is popular for fat loss. High Protein (40/35/25) maximizes muscle retention, especially during a cut. Keto (30/5/65) induces ketosis through very low carbs. None is universally superior - the best diet is the one you can sustain.

What is body recomposition?

Body recomposition means simultaneously losing fat and gaining muscle. It's achievable - particularly for beginners, those returning from a break, or anyone with significant body fat - by eating at a slight calorie deficit while keeping protein very high (1.0g/lb) and training with progressive overload.

Why are training day and rest day macros different?

On training days, your muscles need more glycogen (from carbohydrates) for fuel and recovery. On rest days, energy demand is lower. Carb cycling - eating more carbs on training days and fewer on rest days while keeping protein constant - can optimize performance and body composition.

Should I count fiber in my carbohydrate target?

It depends on your approach. In the U.S., fiber is counted as a carbohydrate on nutrition labels, but many fitness professionals recommend tracking 'net carbs' (total carbs minus fiber). For keto, net carbs are essential for maintaining ketosis. For general fitness goals, tracking total carbs is simpler and still effective.

How do I adjust my macros if I'm not seeing results?

Track your actual intake versus target for 2–3 weeks before making changes. If fat loss has stalled, reduce calories by 100–150 kcal (primarily from carbs or fat, keeping protein the same). If gaining muscle too slowly, add 100–200 kcal from carbs. Always give changes 2–3 weeks before evaluating.

Can I build muscle on a calorie deficit?

Yes, in limited circumstances - primarily for beginners, people returning from a training break, or those with high body fat. Experienced, lean trainees generally cannot build significant muscle in a deficit because muscle protein synthesis requires adequate energy and amino acid availability.

Macro Calculator - Free Macronutrient Calculator

The Complete Guide to Macronutrients

Everything you need to know about tracking protein, carbs, and fat to hit your fitness goals.

What Are Macros and Why Do They Matter?

Macronutrients - protein, carbohydrates, and fat - are the three categories of nutrients that supply your body with energy. Every food you eat contains some combination of these three, and the ratio in which you consume them has a profound effect on your body composition, energy levels, athletic performance, and long-term health.

While calorie counting tells you how much to eat, tracking macros tells you what to eat. Start by finding your Total Daily Energy Expenditure - that's the calorie baseline your macros are built on. Then use the Protein Calculator to fine-tune your protein target, and the Calorie Deficit Calculator to model your fat loss timeline.

Protein4 cal/g

Builds & repairs muscle tissue
Highest thermic effect (20–35%)
Most satiating macronutrient
Preserves lean mass during deficit

Best sources: Chicken, fish, eggs, Greek yogurt, whey, legumes

Carbohydrates4 cal/g

Primary fuel for high-intensity exercise
Glycogen storage in muscles & liver
Supports brain and CNS function
Spares protein for muscle building

Best sources: Rice, oats, potatoes, fruit, vegetables, bread

Fat9 cal/g

Essential for hormone production
Absorbs fat-soluble vitamins A, D, E, K
Protects organs and joints
Slows digestion, improves satiety

Best sources: Avocado, olive oil, nuts, salmon, eggs, cheese

How to Choose the Right Diet Type

There is no single "best" macro ratio. The ideal split depends on your goals, food preferences, schedule, and how your body responds to different fuel sources.

Diet Type	Protein	Carbs	Fat	Best For
Balanced	30%	40%	30%	Sustainable long-term
Low Carb	35%	25%	40%	Lower insulin, good for fat loss
High Protein	40%	35%	25%	Muscle retention & satiety
Keto	30%	5%	65%	Very low carb, ketosis

Adjusting Macros for Your Goal

Fat Loss

Keep protein high (0.8–1.0g/lb) to preserve muscle during deficit
300–500 cal deficit; do not exceed 750 cal deficit without supervision
Carbs: keep above 100g for active people to maintain training performance
Safe rate: 0.5–1% of bodyweight per week

Muscle Gain (Lean Bulk)

200–400 cal surplus above TDEE; more causes excessive fat gain
Protein: 0.8–1.0g/lb bodyweight optimal
Prioritize carbs around workouts for fuel and glycogen replenishment
Expect 0.5–1 lb total weight gain per week; roughly half may be muscle

Body Recomposition

Small deficit (100–250 cal) + very high protein (1.0–1.2g/lb)
Best for beginners or those with >20% body fat
Progress is slow - expect 1–2 lbs fat loss/month while strength increases
Prioritize progressive overload; recomp is driven by training stimulus

How to Track Macros

Get a food scale

Weighing food in grams is 10× more accurate than cups. A $15 digital kitchen scale eliminates the largest source of tracking error.

Log everything for 2 weeks

Even foods you think are 'free' (oils, condiments, coffee creamer) contain meaningful calories. Log accurately for 2 weeks to establish your true baseline.

Meal prep weekly

Batch cooking 3–5 proteins and carbs on Sunday dramatically reduces the daily cognitive load of hitting your macros.

Use the 80/20 rule

Aim to hit your protein target every day, then get carbs and fat roughly right. Consistency over weeks matters more than daily perfection.

Best Food Sources for Each Macro

Protein Sources

Chicken breast - 31g per 100g, very lean
Greek yogurt - 10g per 100g, + probiotics
Eggs - 6g each, complete amino acids
Salmon - 25g per 100g, + omega-3s
Cottage cheese - 11g per 100g, slow-digesting
Whey protein - 25g per scoop, fast-absorbing

Carb Sources

White rice - Easy to digest, neutral flavor
Oats - High fiber, sustained energy
Sweet potato - Dense, micronutrient-rich
Banana - Ideal pre-workout simple carb
Quinoa - Complete protein + carb combo
Whole grain bread - Convenient, high fiber

Fat Sources

Avocado - Heart-healthy monounsaturated fat
Olive oil - Oleic acid, anti-inflammatory
Almonds - 20g fat per oz, vitamin E
Salmon - Omega-3 EPA + DHA
Whole eggs - Balanced fat profile
Dark chocolate - Antioxidants + satisfaction

Sources & References

Morton RW, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength. Br J Sports Med. 2018;52(6):376-384.
Jäger R, et al. International Society of Sports Nutrition Position Stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20.
Helms ER, et al. Evidence-based recommendations for natural bodybuilding contest preparation. J Int Soc Sports Nutr. 2014;11:20.
Mifflin MD, St Jeor ST, et al. A new predictive equation for resting energy expenditure. Am J Clin Nutr. 1990;51(2):241-247.

Macro Calculator - Frequently Asked Questions