Calories and Macros. How to Set Them for Any Goal

Nutrition is the lever that decides whether your training shows. You do not need to track forever, but you do need to start from real numbers rather than guesswork. This is how to set your calories and macros for a lean phase, for maintenance or recomposition, and for building, and what each macronutrient actually does once it is in you.

Your maintenance figure is the energy you burn in a day. Estimate it in two steps.

First, your resting energy, the calories you burn at complete rest. The Mifflin-St Jeor equation is the most accurate of the common predictive equations, landing within about ten percent of measured rates in healthy adults.[1][2]

Resting energy (kcal/day)

Men:    (10 x weight kg) + (6.25 x height cm) - (5 x age) + 5
Women:  (10 x weight kg) + (6.25 x height cm) - (5 x age) - 161

Second, multiply that resting figure by an activity factor to get your total daily energy expenditure, your maintenance.

This number is a starting estimate, not a verdict. Hold your intake steady for two to three weeks and watch the scale and the mirror. If weight is not moving the way the goal needs, adjust the calories, not the formula.

Once you know maintenance, you shift up or down depending on what you are chasing.

Lean phase. Eat below maintenance. A deficit of roughly ten to twenty percent, often around 300 to 500 calories, is sustainable and protects training quality. Aim to lose about 0.5 to 1 percent of bodyweight per week. Slower is better for holding muscle. The leaner and harder you push, the more protein matters, covered below.[4]

Maintenance or recomposition. Eat at maintenance with high protein and hard progressive training. Building muscle while losing fat at the same time, a recomposition, is realistic mainly for newer trainees, those returning after a break, or those carrying higher body fat. For lean and experienced lifters it is slow, and a dedicated build or cut moves faster. An energy surplus is not strictly required to grow, but it makes muscle gain easier and faster in trained lifters.[7]

Build phase. Eat above maintenance. A surplus of about ten to twenty percent supports muscle gain while limiting fat. Target a gain of roughly 0.25 to 0.5 percent of bodyweight per week for novice and intermediate trainees. The more advanced you are, the smaller the surplus and the slower the gain should be, because the rate you can actually build muscle is capped and the rest arrives as fat.[5]

Calories decide weight. Macros decide what that weight is made of, and how you train and recover. Set them in order: protein, then fat, then carbohydrates fill the rest. Protein and carbohydrate are 4 calories per gram, fat is 9.

Protein first. For building muscle, total intake beyond about 1.6 grams per kilogram of bodyweight per day adds little, with a sensible upper bound near 2.2.[3] In a lean phase, when calories are low and you are already lean, needs rise to roughly 2.3 to 3.1 grams per kilogram of fat free mass, scaled up with how aggressive the cut is, to protect muscle.[4] A simple practical target most people can run: 1.6 to 2.2 grams per kilogram of bodyweight when building or maintaining, toward the higher end or above when cutting.

Fat next. Set fat at roughly 0.5 to 1.5 grams per kilogram of bodyweight per day. Do not drop it too low. Holding fat above about twenty percent of total calories protects hormone production, including testosterone.[5][6]

Carbohydrates fill the rest. Whatever calories remain after protein and fat go to carbohydrates. Carbohydrate is your training fuel, so a build or performance phase generally runs higher carbs, a cut runs lower as calories come down.

Worked example. An 85 kg man, 180 cm, 32 years old, training four days a week, in a build phase.

Resting:      (10 x 85) + (6.25 x 180) - (5 x 32) + 5  = 1820 kcal
Maintenance:  1820 x 1.55                               = 2821 kcal
Build (+15%): 2821 x 1.15                               ~ 3250 kcal

Protein  2.0 g/kg x 85 = 170 g  = 680 kcal
Fat      1.0 g/kg x 85 =  85 g  = 765 kcal
Carbs    remainder 3250 - 680 - 765 = 1805 kcal = ~451 g

Daily target: ~3250 kcal, 170 P / 451 C / 85 F

Protein. The raw material for repairing and building muscle. It drives the muscle protein synthesis that resistance training switches on, which is why intake matters most around a training stimulus.[3] It is also the most filling macronutrient and carries the highest thermic effect, meaning more of its energy is spent on digestion, both useful in a lean phase.

Carbohydrates. Your primary and preferred training fuel. Carbohydrate refills muscle glycogen, the stored energy that powers hard sets, so adequate intake supports training output and recovery. It also spares protein, leaving protein free to do its building job rather than being burned for energy.

Fat. Essential, not optional. Dietary fat supports hormone production, builds the membrane of every cell, and is required to absorb the fat soluble vitamins A, D, E and K. Certain fats are essential, meaning the body cannot make them and they must come from food. This is why cutting fat too hard backfires on health and hormones.[5][6]

1. Calculate resting energy with Mifflin-St Jeor.
2. Multiply by your activity factor to get maintenance.
3. Shift up or down for your goal: deficit to lean, maintenance to hold or recomp, surplus to build.
4. Set protein, then fat, then fill the rest with carbohydrates.
5. Run it for two to three weeks, track weight and how you look and train, then adjust the calories by 100 to 200 at a time.

The maths gives you the start line. Your own results over the following weeks give you the truth. Consistency over intensity. The standard is daily.