Tracking macros means counting the grams of protein, carbohydrates, and fat you eat each day instead of just counting total calories. This approach gives you more control over body composition because where your calories come from affects hunger, muscle retention, and how efficiently your body burns energy. The process has a few steps: estimate your calorie needs, set a deficit, divide those calories into macro targets, then track your food to hit those targets consistently.
What Macros Are and Why They Matter
Every calorie you eat comes from one of three macronutrients. Protein and carbohydrates each provide 4 calories per gram. Fat provides 9 calories per gram, more than double the other two. This is why small changes in fat intake have an outsized effect on your total calorie count, and why understanding the math behind macros makes weight loss more predictable than vague portion control.
Beyond raw calories, each macro behaves differently in your body. Protein has the highest thermic effect of food, meaning your body uses 15 to 30 percent of protein calories just to digest and process it. Carbohydrates use 5 to 10 percent, and fats use only 0 to 3 percent. So 200 calories from chicken breast costs your body significantly more energy to process than 200 calories from butter. This is one reason high-protein diets consistently outperform other approaches for fat loss, even at the same calorie level.
Step 1: Calculate Your Calorie Target
Before you can set macros, you need a calorie target. Start by estimating your total daily energy expenditure (TDEE), which is how many calories you burn in a full day including all activity. The most widely used method is the Mifflin-St Jeor equation, which calculates your basal metabolic rate (the calories your body burns at rest) and then multiplies by an activity factor.
The base formula works like this: multiply your weight in kilograms by 10, add your height in centimeters multiplied by 6.25, then subtract your age multiplied by 5. Men add 5 to the result; women subtract 161. That gives you your resting metabolic rate. Then multiply by an activity factor: 1.2 if you’re sedentary, 1.375 if you’re lightly active (light exercise one to three days per week), 1.55 for moderate activity, 1.725 for heavy training, or 1.9 for very intense daily exercise.
For example, a 35-year-old woman who weighs 70 kg (154 pounds), stands 165 cm (5’5″), and exercises moderately would calculate: (10 × 70) + (6.25 × 165) − (5 × 35) − 161 = 1,396 calories at rest. Multiplied by 1.55, her TDEE is roughly 2,164 calories. To lose about one pound per week, she’d subtract 500 calories, landing at a daily target of around 1,664 calories. A deficit of 500 to 1,000 calories per day produces weight loss of one to two pounds per week, which is the rate most experts consider safe and sustainable. Just keep your intake above 1,200 calories per day for women or 1,500 for men.
Step 2: Set Your Protein Target First
Protein is the most important macro to get right during a deficit. It preserves muscle mass while you lose fat, keeps you fuller for longer, and burns more calories during digestion than the other macros. The general recommendation of 0.8 grams per kilogram of body weight is a minimum for basic health, not an optimal target for someone actively losing weight.
For fat loss, aim for 1.0 to 1.6 grams of protein per kilogram of body weight. Using our example above, the 70 kg woman would target 70 to 112 grams of protein daily. If you’re strength training (which you should be during a cut to protect muscle), lean toward the higher end. At 4 calories per gram, 100 grams of protein accounts for 400 of her 1,664 daily calories.
Step 3: Set Your Fat Minimum
Dietary fat isn’t just a calorie source. Your body needs it to produce hormones like testosterone, estrogen, and progesterone. Cholesterol from dietary fat serves as the raw material for these hormones, so cutting fat too low can cause hormonal disruptions that stall weight loss and affect energy, mood, and recovery. The minimum recommendation for hormonal health is about 0.8 to 1.0 grams of fat per kilogram of body weight.
For our 70 kg example, that’s 56 to 70 grams of fat per day. At 9 calories per gram, 63 grams of fat equals 567 calories. This is a floor, not a ceiling. You can eat more fat if you prefer a higher-fat diet, as long as your total calories stay in your deficit range.
Step 4: Fill the Rest With Carbs
Once protein and fat are set, your remaining calories go to carbohydrates. This is simple subtraction. Using our running example with 1,664 total calories, 400 from protein, and 567 from fat, that leaves 697 calories for carbs. At 4 calories per gram, that’s about 174 grams of carbohydrates.
Her final macro targets would be: 100g protein, 63g fat, 174g carbs. That works out to roughly 24% protein, 34% fat, and 42% carbs. This falls well within the range that research supports for weight loss: 25 to 35 percent protein, 20 to 30 percent fat, and 30 to 40 percent carbs. But notice that you arrived at these percentages by setting absolute gram targets based on body weight, not by picking arbitrary percentages. That’s the more reliable approach because a percentage-based split can leave a smaller person eating too little protein or a larger person eating too much fat.
Tracking Your Food
An app like MyFitnessPal, Cronometer, or MacroFactor is the easiest way to log meals. Weigh your food with a kitchen scale, at least for the first few weeks. People routinely underestimate portions by 30 to 50 percent, and eyeballing servings is the most common reason macro tracking “doesn’t work.” A $15 food scale removes the guesswork.
When logging, use total carbohydrates rather than net carbs. Net carbs subtract fiber and sugar alcohols from the total, but this calculation isn’t always accurate. Some fibers and sugar alcohols are partially digested and still contribute calories. The FDA and the American Diabetes Association both recommend using total carbohydrates for more reliable tracking.
You don’t need to hit your targets to the exact gram. Within 5 to 10 grams of each macro is close enough. Prioritize hitting your protein target and staying at or below your calorie goal. If you go slightly over on carbs one day and under on fat, the effect on your weekly progress is negligible. Consistency over weeks matters far more than perfection on any single day.
What to Do When Weight Loss Stalls
Plateaus are normal. As you lose weight, your body requires fewer calories to function, so the deficit that worked at 180 pounds won’t produce the same results at 165. If your weight hasn’t changed in two full weeks despite consistent tracking, it’s time to adjust. The standard approach is a small reduction of about 5 percent of your daily calories, which typically means cutting 100 to 200 calories.
Where you pull those calories from matters. Don’t cut protein. If anything, increase protein slightly during a plateau to help with satiety and muscle preservation. Instead, reduce carbs or fat. If your energy during workouts has been fine, pulling from carbs is the simplest move. If you’re already on the lower end of carb intake and feeling sluggish during exercise, trim fat instead, but don’t drop below that 0.8 grams per kilogram minimum.
Recalculate your TDEE every 10 to 15 pounds of weight loss. Your calorie needs change as your body gets smaller, and the macro targets that worked at the start of your cut may need updating. This recalculation is the single most overlooked step in long-term macro tracking, and skipping it is the most common reason people feel like they’ve hit a permanent wall.
Putting It All Together
Here’s the full process in order:
- Calculate TDEE using the Mifflin-St Jeor equation and your activity level
- Subtract 500 calories for roughly one pound of loss per week (or up to 1,000 for two pounds)
- Set protein at 1.0 to 1.6 grams per kilogram of body weight
- Set fat at a minimum of 0.8 to 1.0 grams per kilogram
- Assign remaining calories to carbohydrates
- Track daily with a food scale and an app
- Reassess every two weeks and adjust by 5 percent if progress stalls
The macro approach works because it gives you structure without eliminating entire food groups. You can eat carbs, fat, and the foods you enjoy as long as they fit your numbers. That flexibility is what makes it sustainable over months, which is ultimately what determines whether any diet produces lasting results.