Counting macros means tracking the three macronutrients in your food: protein, carbohydrates, and fat. Each one provides a different amount of energy. Protein and carbs each supply 4 calories per gram, while fat supplies 9 calories per gram. By knowing those numbers and setting daily targets for each, you can shape your diet around specific goals like losing fat, building muscle, or simply eating more balanced meals.
Step 1: Estimate Your Daily Calorie Needs
Before you split anything into macros, you need a calorie baseline. This starts with your basal metabolic rate (BMR), the number of calories your body burns at complete rest just to keep you alive. The most commonly referenced formula works like this:
- For men: 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) − (5.677 × age in years)
- For women: 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) − (4.330 × age in years)
To convert pounds to kilograms, divide by 2.2. To convert inches to centimeters, multiply by 2.54. A 30-year-old woman who weighs 150 pounds and stands 5’5″ would get a BMR of roughly 1,400 calories.
Your BMR only reflects rest. To account for how much you actually move, multiply it by an activity factor:
- Sedentary (desk job, little exercise): BMR × 1.2
- Lightly active (light exercise 1–3 days per week): BMR × 1.375
- Moderately active (moderate exercise 3–5 days per week): BMR × 1.55
The result is your total daily energy expenditure, or TDEE. That same 30-year-old woman, if lightly active, would land around 1,925 calories per day. If your goal is fat loss, subtracting 300 to 500 calories from your TDEE gives you a reasonable deficit. If you want to gain muscle, adding 200 to 300 calories creates a slight surplus.
Step 2: Set Your Macro Targets
Once you have a calorie number, you divide it among protein, carbs, and fat. The Dietary Guidelines for Americans 2020–2025 recommend that adults get 10–35% of calories from protein, 45–65% from carbohydrates, and 20–35% from fat. Those wide ranges exist because the right split depends on your body and your goals.
For General Health
A balanced starting point is roughly 30% protein, 40% carbs, and 30% fat. On a 2,000-calorie diet, that works out to 150 grams of protein, 200 grams of carbs, and 67 grams of fat. This gives you enough protein to support muscle without dramatically restricting any food group.
For Fat Loss
Protein becomes more important when you’re eating fewer calories, because it helps preserve muscle and keeps you fuller for longer. Research suggests that 1.2 to 2 grams of protein per kilogram of body weight supports fat loss effectively. For a 170-pound person, that’s roughly 93 to 155 grams of protein per day. Keep fat between 20 and 30% of your total calories, then fill the rest with carbs.
For Muscle Gain
Aim for the higher end of that protein range, closer to 1.6 to 2 grams per kilogram of body weight. You’ll also want more total calories, so carbs typically go up to fuel your training. A common split for muscle building is 30% protein, 45% carbs, and 25% fat.
Step 3: Learn to Read the Label
Every packaged food in the U.S. carries a Nutrition Facts label with three lines you care about: Total Fat, Total Carbohydrate, and Protein. Each is listed in grams per serving. The critical detail most beginners miss is the serving size at the top. All the numbers on the label refer to that specific portion. If the serving size is one cup and you eat two cups, you double every number.
You may also see “net carbs” mentioned in low-carb communities. This is calculated by subtracting fiber and sugar alcohols from total carbohydrates. The American Diabetes Association defines net carbs this way, and it can be useful if you’re following a keto-style approach. For general macro counting, tracking total carbohydrates is simpler and perfectly fine.
Step 4: Weigh Your Food (At Least at First)
A digital kitchen food scale is the single most useful tool for accurate macro counting, and a reliable one costs under $15. Volume measurements like cups and tablespoons are surprisingly inconsistent. A cup of flour, for instance, can vary by as much as 3 tablespoons depending on whether it was scooped, spooned, or packed down. Granular salt can contain twice as much actual salt per teaspoon as flake salt, simply because the granules fill the empty space in the spoon more efficiently.
Weight, by contrast, is a direct measurement of the food itself. When you place 100 grams of oats on a scale, you get 100 grams of oats every time, regardless of how fluffy or compressed they are. After a few weeks of weighing portions, you’ll develop a good eye for common serving sizes and won’t need the scale for every meal.
Raw vs. Cooked Weight
Meat loses about 25% of its weight during cooking as water evaporates. Four ounces of raw ground beef becomes roughly 3 ounces cooked, and 8 ounces of raw chicken shrinks to about 6 ounces. Most nutrition databases list entries for both raw and cooked versions, so the key is to be consistent. If you weigh your chicken breast raw, log it as raw. If you weigh it after cooking, search for the cooked entry. Mixing the two up is one of the most common tracking errors beginners make, and it can throw off your protein count significantly over the course of a day.
A simple conversion: multiply raw weight by 0.75 to estimate cooked weight, or divide cooked weight by 0.75 to estimate what it weighed raw.
Step 5: Pick a Tracking App
Logging food in a notebook is possible, but an app makes the math automatic. Several options stand out for different needs:
- MyFitnessPal: The largest food database, with a barcode scanner and restaurant entries. The free version is ad-heavy, and because many entries are user-submitted, double-check numbers against the label when possible.
- Cronometer: Uses a verified food database, so entries tend to be more accurate. It also tracks vitamins and minerals in detail, making it a strong choice if you follow a keto or fasting protocol. The interface is less streamlined than some alternatives.
- Lose It!: Has a clean, simple layout that works well for people who want habit-building without complexity. It’s lighter on detailed macro tools than the other options.
- MacroFactor: Uses an algorithm that adjusts your targets over time based on your actual weight trend. Powerful for intermediate trackers, but the learning curve can feel steep on day one.
Any of these will get you started. The best app is the one you’ll actually open every day. Most beginners do well with MyFitnessPal or Cronometer because of their large databases and barcode scanning.
Practical Tips That Make Tracking Stick
Log your food before or during the meal, not hours later. Memory is unreliable, and catching a meal in the moment takes 30 seconds with a barcode scan. Logging retroactively at the end of the day turns a quick habit into a chore.
Pre-logging is even better. If you plan tomorrow’s meals tonight, you can adjust portions before you eat to hit your targets more precisely. This also removes decision fatigue during a busy day, because you already know what’s on the menu.
Don’t aim for perfection. Landing within 5 to 10 grams of each macro target is close enough. Obsessing over exact numbers leads to burnout faster than anything else. The goal is a pattern that’s consistently close, not a daily math exam.
Eating similar meals on repeat simplifies tracking enormously during the first few weeks. If your breakfast and lunch are roughly the same most days, you only need to log them once and copy them forward. That leaves dinner as the only variable meal to figure out. As you get more comfortable, you can introduce variety without it feeling like extra work.
A Sample Day in Practice
Here’s what a day of macro counting looks like for someone targeting 2,000 calories with a 30/40/30 split (150g protein, 200g carbs, 67g fat):
- Breakfast: 3 eggs scrambled with spinach, 1 slice of whole wheat toast, half an avocado. Roughly 30g protein, 25g carbs, 25g fat.
- Lunch: 6 oz grilled chicken breast (weighed cooked), 1 cup of rice (weighed cooked), mixed vegetables with a tablespoon of olive oil. Roughly 45g protein, 55g carbs, 18g fat.
- Snack: Greek yogurt with a handful of berries and a tablespoon of almonds. Roughly 20g protein, 25g carbs, 8g fat.
- Dinner: 5 oz salmon, roasted sweet potato, side salad with vinaigrette. Roughly 40g protein, 50g carbs, 16g fat.
- Evening snack: Protein shake with a banana. Roughly 25g protein, 30g carbs, 2g fat.
Totals: about 160g protein, 185g carbs, 69g fat. That’s close enough to the targets. Over a full week, small daily variations like these balance out, and the overall trend is what drives results.