Counting macros means setting daily gram targets for protein, carbohydrates, and fat, then tracking what you eat to hit those numbers. It’s a flexible approach to nutrition that works for weight loss, muscle gain, or simply eating more intentionally. The process boils down to three steps: figure out how many calories you need, divide those calories among the three macronutrients, and track your food. Here’s exactly how to do each one.
What Macros Are and Why They Matter
Every calorie you eat comes from one of three macronutrients. Protein and carbohydrates each contain 4 calories per gram. Fat is more than twice as calorie-dense at 9 calories per gram. Alcohol, if you drink it, adds 7 calories per gram but provides no nutritional benefit.
The reason people track macros rather than just calories is that the source of your calories changes how your body responds. Two people eating 2,000 calories a day can look and feel very different depending on whether those calories come mostly from protein, carbs, or fat. Protein builds and preserves muscle. Carbohydrates fuel intense exercise and brain function. Fat supports hormone production and helps your body absorb certain vitamins. Getting the ratio right for your goals is the whole point.
Step 1: Find Your Daily Calorie Target
Before you split anything into macros, you need to know how many total calories your body uses in a day. This number is called your Total Daily Energy Expenditure, or TDEE, and it’s built from three components: your resting metabolic rate (the energy your body burns just staying alive), the calories you burn through physical activity, and the energy used to digest food (roughly 10% of your total intake).
The simplest way to estimate your resting metabolic rate is by body weight. Men burn approximately 1 calorie per kilogram of body weight per hour. Women burn about 0.9 calories per kilogram per hour. Multiply that across 24 hours to get your daily resting rate.
Then multiply your resting rate by an activity factor:
- Sedentary (desk job, little exercise): 1.2
- Somewhat active (light exercise 1-2 days/week): 1.3
- Moderately active (exercise 3-4 days/week): 1.4
- Very active (hard exercise 5-6 days/week): 1.6
- Extremely active (2+ hours daily): 1.7-1.8
For example, a 180-pound (82 kg) man with a moderate exercise routine would calculate: 82 kg × 1 cal/kg/hr × 24 hours = 1,968 calories at rest, then 1,968 × 1.4 = about 2,755 calories per day. To lose weight, you’d eat below that number. To gain muscle, you’d eat above it. A deficit of 300 to 500 calories per day is a common starting point for fat loss.
Step 2: Set Your Macro Targets
Once you have a calorie number, you divide it among protein, carbs, and fat. There are two ways to do this: the percentage method and the weight-based method. The weight-based method tends to be more precise, especially for protein.
Start With Protein
The government’s minimum recommendation for protein is 0.8 grams per kilogram of body weight, but that’s the floor for basic health, not a performance target. If you’re exercising regularly or trying to change your body composition, you need more. Research on active adults and physique athletes recommends 1.8 to 2.7 grams per kilogram per day. People who are cutting calories aggressively can benefit from going as high as 3.5 grams per kilogram to manage hunger, though that level isn’t necessary for most people.
For a 150-pound (68 kg) person aiming to build muscle, a solid target might be 2.0 g/kg, which works out to about 136 grams of protein per day, or 544 calories from protein.
Set Your Fat Minimum
Fat should make up roughly 20 to 30% of your total calories for general health. Going below 15% for extended periods can interfere with hormone production and isn’t recommended. For someone eating 2,000 calories, 25% from fat equals 500 calories, or about 56 grams of fat per day (500 ÷ 9 calories per gram).
Fill the Rest With Carbs
Whatever calories remain after protein and fat go to carbohydrates. Using the example above: 2,000 total calories minus 544 from protein minus 500 from fat leaves 956 calories for carbs. Divide by 4 calories per gram, and you get about 239 grams of carbohydrates.
Your final targets for this example would be: 136g protein, 56g fat, 239g carbs. Write these numbers down or plug them into a tracking app.
Step 3: Track What You Eat
Tracking means logging every meal and snack so you can see how your actual intake stacks up against your targets. The learning curve is steepest in the first week or two, then it gets faster as you start repeating meals.
A food scale is the single most useful tool for accuracy. Weigh food in its raw, uncooked state whenever possible. A raw chicken breast always has the same macros per gram regardless of how you cook it, but a cooked piece of chicken could weigh very different amounts depending on cooking method and time. You can’t reverse-engineer the original weight reliably. The one exception is packaged food that lists its nutrition facts for the cooked or prepared version.
For tracking apps, MyFitnessPal is the most widely used option, with a barcode scanner and a large restaurant database, though the free version has ads and some user-submitted food entries can be inaccurate. Cronometer uses a verified food database and gives detailed micronutrient breakdowns, which is useful if you care about vitamins and minerals too, but logging is a bit slower. MacroFactor uses an algorithm that adjusts your targets automatically based on your progress, though it has a steeper learning curve. Lose It! has the cleanest interface for people who want simplicity over deep data.
A Note on Net Carbs and Fiber
If you see “net carbs” on a label or in a recipe, that’s total carbohydrates minus fiber and sugar alcohols. A food with 24 grams of total carbs but 10 grams of fiber and 8 grams of sugar alcohols would have only 6 net carbs. This distinction matters most for people following low-carb or ketogenic diets. If you’re just tracking total macros without a specific carb restriction, counting total carbs is simpler and works fine.
When to Adjust Your Numbers
Your starting macros are an educated estimate, not a permanent prescription. Expect to adjust them. Weigh yourself at the same time each day (morning, after using the bathroom) and look at the weekly average rather than any single day’s reading.
If you’re trying to lose weight and your average weight hasn’t budged for two to three weeks, you’ve likely hit a plateau. This happens because your body burns fewer calories as you get lighter, and the calories you eat eventually match what you burn. At that point, you can reduce your daily intake by another 100 to 200 calories, ideally by trimming carbs or fat rather than protein. The Mayo Clinic cautions against dropping below 1,200 calories total, as chronic hunger at that level makes overeating more likely.
If you’re gaining weight for muscle but also putting on noticeable fat, scale your surplus back by 100 to 200 calories. And whenever your body weight changes by more than 10 pounds in either direction, it’s worth recalculating your TDEE from scratch, since your resting metabolic rate shifts with your weight.
Practical Tips That Make Tracking Easier
Meal prep is the single biggest shortcut. If you cook a batch of chicken, rice, and vegetables on Sunday, you weigh and log each ingredient once, then just copy that entry for every meal you pull from the batch. Most tracking apps let you save meals or recipes so you can log them with one tap.
You don’t need to hit your targets to the gram. Landing within 5 to 10 grams of each macro on most days is precise enough to see results. Obsessing over single-gram accuracy often leads to burnout. Focus on protein first, since it’s the macro most people under-eat, then get your fat above the minimum, and let carbs fill in around those anchors.
Eating out is the hardest situation for tracking. Chain restaurants often have nutrition information available online or in the app databases. For independent restaurants, estimate portions by comparing to foods you’ve weighed at home. A palm-sized piece of meat is roughly 4 ounces raw. A cupped handful of rice is about half a cup cooked. These aren’t perfect, but occasional estimates won’t derail your progress if your home meals are dialed in.