Counting macros means tracking the three macronutrients in everything you eat: protein, carbohydrates, and fat. Each one provides a specific number of calories per gram (protein has 4, carbs have 4, fat has 9), and by setting a target for each one rather than just tracking total calories, you get much more control over your body composition, energy, and performance. Here’s exactly how to set your numbers and start tracking.
Step 1: Find Your Daily Calorie Target
Before you can split calories into macros, you need to know how many calories your body burns in a day. The most widely used method starts with the Mifflin-St Jeor equation, which estimates how many calories you burn at complete rest based on your weight, height, age, and sex.
For women: (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) − 161
For men: (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + 5
To convert pounds to kilograms, divide by 2.2. To convert inches to centimeters, multiply by 2.54. A 30-year-old man who weighs 180 pounds (81.8 kg) and stands 5’10” (177.8 cm) would get: (10 × 81.8) + (6.25 × 177.8) − (5 × 30) + 5 = 1,782 calories at rest.
That resting number isn’t your actual daily burn, though. You need to multiply it by an activity factor:
- Sedentary (desk job, no exercise): × 1.2
- Lightly active (light exercise 1–3 days/week): × 1.375
- Moderately active (moderate exercise 3–5 days/week): × 1.55
- Active (hard exercise 6–7 days/week): × 1.725
- Very active (intense daily training or physical job): × 1.9
That same 30-year-old man exercising moderately would multiply 1,782 × 1.55 = roughly 2,762 calories per day. This is his maintenance number. To lose fat, subtract 300–500 calories from it. To gain muscle, add 200–300.
Step 2: Set Your Protein Target
Protein is the macro most people should set first, because the range varies dramatically based on how active you are. The baseline recommendation for a sedentary adult is 0.8 grams per kilogram of body weight per day, but that’s a minimum to prevent deficiency, not an optimal target.
If you exercise regularly, you need more. People who do cardio or general fitness training do well with 1.1 to 1.5 grams per kilogram. If you lift weights or train for endurance events like running or cycling, aim for 1.2 to 1.7 grams per kilogram. Intake above 2 grams per kilogram per day is generally considered excessive for most people.
For our 180-pound (81.8 kg) man who lifts weights, a good protein target might be around 1.5 grams per kilogram, which comes out to roughly 123 grams of protein per day. At 4 calories per gram, that’s 492 calories from protein.
Step 3: Set Your Fat Target
Fat is the second macro to lock in because it has a floor you shouldn’t drop below. Your body needs dietary fat to produce hormones, absorb certain vitamins, and maintain cell function. The recommended minimum for both men and women is around 0.8 to 1 gram of fat per kilogram of body weight. Going below that threshold consistently can disrupt hormone production.
Federal dietary guidelines place the healthy range for fat at 20 to 35 percent of total calories. For someone eating 2,262 calories (our example man in a 500-calorie deficit), 25 percent from fat would be about 565 calories, or 63 grams of fat. That also happens to land right at 0.77 grams per kilogram, so he’d want to round up slightly to hit the minimum. Bumping to 70 grams (630 calories) gives a comfortable margin.
Step 4: Fill the Rest With Carbs
Once protein and fat are set, the remaining calories go to carbohydrates. This is simple math. Take your total calorie target, subtract the calories from protein and fat, then divide by 4 (since carbs have 4 calories per gram).
Using our running example: 2,262 total calories − 492 protein calories − 630 fat calories = 1,140 calories left. Divide by 4, and you get 285 grams of carbs per day. Federal guidelines suggest carbohydrates make up 45 to 65 percent of total calories, and this lands at about 50 percent, right in the middle.
So his final macros would be: 123g protein, 70g fat, 285g carbs.
How to Track What You Eat
With your targets set, the practical part is logging food accurately. A food scale is the single most useful tool for this. Eyeballing portions is notoriously inaccurate, especially for calorie-dense foods like nuts, oils, cheese, and peanut butter, where a tablespoon more or less can mean 100 extra calories.
Most people use an app like MyFitnessPal, Cronometer, or MacroFactor. You weigh your food, search for the item in the app’s database, and enter the amount. The app calculates the macros automatically and shows your running totals for the day.
One important detail: always check whether a database entry refers to raw or cooked weight. Meat loses roughly 20 to 25 percent of its weight during cooking as water evaporates. If you weigh a cooked chicken breast but log it as raw, you’ll undercount your protein and calories. Pick one approach (raw or cooked) and make sure the database entry matches. Raw entries tend to be more standardized and consistent.
Reading Nutrition Labels
Packaged foods make tracking easier because the macros are printed right on the label. The key numbers are total fat, total carbohydrate, and protein, all listed in grams. Multiply each by its calorie value (fat × 9, carbs × 4, protein × 4) and you have the caloric breakdown.
Pay attention to serving sizes. A bag of chips might list 15 chips as one serving, and the bag could contain three servings. If you eat the whole bag, you triple every number on the label.
Net Carbs vs. Total Carbs
If you’re following a lower-carb approach, you may want to track net carbs instead of total carbs. Fiber passes through your body without being fully digested, so many people subtract fiber grams from total carbohydrate grams. For products containing sugar alcohols (common in protein bars and sugar-free snacks), the UCSF Diabetes Teaching Center recommends subtracting half of the sugar alcohol grams from total carbs, not all of them. So a bar with 29 grams of total carbs and 18 grams of sugar alcohols would count as 20 grams of net carbs (29 minus 9).
Making It Sustainable
The first week of tracking feels tedious. That’s normal. It gets dramatically faster once you’ve logged your usual meals a few times, because apps save your frequent foods and recent entries. Most people rotate through 15 to 20 meals regularly, and after a couple of weeks, logging takes under five minutes a day.
A few strategies that help with consistency:
- Meal prep in batches. Cook a large quantity of protein and carbs at once, weigh and divide it into containers, and log the whole batch as a recipe in your app. Each container is one serving with known macros.
- Front-load protein. Protein is the hardest macro for most people to hit. Planning a protein source at every meal (eggs at breakfast, chicken at lunch, fish at dinner) keeps you from scrambling at 9 PM with 60 grams still to go.
- Don’t aim for perfection. Landing within 5 to 10 grams of each target is close enough. Obsessing over hitting exact numbers creates stress that makes tracking feel punishing rather than useful.
- Log before you eat. Planning your meals the night before or the morning of lets you adjust portions before the food is on your plate, rather than realizing at dinner that you’ve already used up your fat target.
Adjusting Your Macros Over Time
Your starting macros are an educated estimate, not a permanent prescription. Track consistently for two to three weeks, then evaluate. If you’re trying to lose fat and the scale hasn’t budged, your actual calorie needs are likely lower than the equation predicted. Drop total calories by 100 to 200 (usually by reducing carbs or fat slightly) and reassess after another two weeks.
If you’re losing weight but feeling flat during workouts, your carbs may be too low. If you’re constantly hungry, bumping protein up (and reducing carbs or fat by the same calorie amount) often helps, since protein is the most satiating macronutrient. Your macros should shift as your weight changes, your activity level shifts, or your goals evolve. Recalculating every 10 to 15 pounds of weight change keeps your targets relevant.