Your macro goals depend on your body weight, activity level, and whether you’re trying to lose fat, build muscle, or maintain your current weight. The U.S. Dietary Guidelines recommend a baseline split of 45–65% of calories from carbohydrates, 20–35% from fat, and 10–35% from protein. But those ranges are wide for a reason: the right targets for you narrow considerably once you factor in your specific situation.
Here’s how to figure out your actual numbers.
Start With Your Total Calories
Before you can set macro goals, you need a calorie target. Your body burns energy in three ways: keeping you alive at rest (your resting metabolic rate), digesting food, and moving throughout the day. Together, these make up your total daily energy expenditure, or TDEE.
The simplest method is to estimate your resting metabolic rate using an online calculator (the Mifflin-St Jeor equation is the most commonly recommended), then multiply by an activity factor:
- Sedentary (desk job, little exercise): multiply by 1.2
- Somewhat active (light exercise 1–2 days/week): multiply by 1.3
- Moderately active (exercise 3–4 days/week): multiply by 1.4–1.5
- Very active (hard training 5–6 days/week): multiply by 1.6
- Extremely active (2+ hours daily): multiply by 1.7–1.8
That number is your maintenance calories. To lose weight, subtract 300–500 calories. To gain muscle, add 200–300. To maintain, eat at or near that number. Once you have a calorie target, you can divide it among your three macros: protein, fat, and carbohydrates. Each gram of protein or carbohydrate provides 4 calories, while each gram of fat provides 9.
Set Protein First
Protein is the macro worth nailing down most precisely, because it directly affects whether you build muscle, lose muscle, or maintain what you have. The official RDA is 0.8 grams per kilogram of body weight (about 0.36 grams per pound), but that number represents the minimum to prevent deficiency, not the amount that optimizes body composition.
For most people who exercise regularly, a better range is 1.2 to 2.0 grams per kilogram of body weight. Where you land within that range depends on your goal:
- General health or maintenance: 1.2–1.6 g/kg is typically sufficient.
- Fat loss while preserving muscle: Aim toward the higher end, around 1.6–2.0 g/kg. When you’re in a calorie deficit, extra protein helps protect lean tissue.
- Muscle building: 1.6–2.0 g/kg covers most people. Going above 2.0 g/kg rarely provides additional benefit for muscle growth.
For a 70 kg (154 lb) person, that works out to roughly 84–140 grams of protein per day. For an 85 kg (187 lb) person, it’s about 102–170 grams.
If You’re Over 65
Older adults lose muscle more easily and use dietary protein less efficiently. Researchers recommend that adults over 65 consume 1.0–1.2 grams of protein per kilogram of body weight even without intense exercise, simply to prevent age-related muscle loss.
Set Fat Second
Dietary fat is essential for absorbing certain vitamins, producing hormones, and maintaining cell structure. Dropping fat too low can disrupt hormone levels, particularly testosterone and estrogen. A practical minimum is about 0.8–1.0 grams of fat per kilogram of body weight.
For most people, fat should make up 20–35% of total calories. If you’re eating 2,000 calories a day, that’s roughly 44–78 grams of fat. Staying at or above that 20% floor protects hormonal health. Going above 35% is fine for some eating patterns (like lower-carb approaches), but it leaves less room for carbohydrates, which fuel higher-intensity exercise.
One practical tip: if you consistently feel sluggish, have dry skin, or notice hormonal changes after cutting calories, your fat intake may be too low. It’s one of the first macros people slash when dieting, and often the wrong one to cut aggressively.
Fill the Rest With Carbohydrates
Once protein and fat are set, your remaining calories go to carbohydrates. This isn’t because carbs are less important. It’s because carb needs vary the most based on how much and how hard you exercise.
Carbohydrate recommendations for active people, measured in grams per kilogram of body weight:
- Light activity or skill-based sports (golf, yoga): 3–5 g/kg
- Moderate to high intensity, about 1 hour/day: 5–7 g/kg
- High intensity endurance, 1–3 hours/day: 6–10 g/kg
- Extreme training, 4–5 hours/day: 8–12 g/kg
If you’re sedentary or lightly active and your primary goal is fat loss, you’ll naturally end up on the lower end (or below these ranges) after accounting for protein and fat. That’s fine. Carbs fuel activity, so people who move less simply need fewer of them.
Within your carb target, aim for 14 grams of fiber per 1,000 calories you eat. For most women eating around 2,000 calories, that’s about 28 grams. For most men eating around 2,400–2,600 calories, it’s roughly 34 grams. Hitting that fiber target naturally pushes you toward whole grains, fruits, vegetables, and legumes rather than refined sources.
A Worked Example
Say you’re a 75 kg (165 lb) person who exercises moderately (4 days a week, mix of lifting and cardio), and your goal is to lose some fat while keeping muscle. Here’s how the math might look:
Your estimated TDEE is around 2,250 calories. Subtracting 400 for a moderate deficit gives you a target of 1,850 calories per day.
- Protein: 1.8 g/kg = 135 g = 540 calories
- Fat: 1.0 g/kg = 75 g = 675 calories
- Carbohydrates: remaining 635 calories ÷ 4 = about 159 g
As a percentage split, that’s roughly 29% protein, 36% fat, and 34% carbs. Notice it doesn’t match any clean “40/30/30” template, and that’s perfectly normal. Percentage-based splits are a rough guide. Setting protein and fat in grams based on your body weight, then filling the remainder with carbs, produces a more personalized result.
Why Percentages Can Be Misleading
Many popular macro calculators spit out a simple percentage like 40% carbs, 30% protein, 30% fat. The problem is that percentages shift your actual gram targets whenever your calorie goal changes. Someone eating 1,500 calories at 30% protein gets 113 grams of protein. Someone eating 2,500 calories at 30% protein gets 188 grams. Their bodies may need the same amount of protein, but the percentage approach gives them wildly different numbers.
A better approach is to set protein and fat as fixed gram amounts based on your body weight, then let carbs absorb whatever flexibility your calorie target requires. When you cut calories to lose weight, the reduction comes mostly from carbs and a little from fat, while protein stays high enough to protect your muscle.
Adjusting for Higher Body Fat
If you carry a significant amount of body fat, using your total body weight to calculate protein and fat goals can overshoot your needs. A 120 kg person at 40% body fat has very different lean tissue than a 120 kg person at 15% body fat. In these cases, using your goal weight or an estimate of your lean body mass (total weight minus fat mass) as the basis for your calculations gives more realistic targets. If you don’t know your body fat percentage, using your goal weight as a rough proxy works well enough.
How to Know Your Macros Are Working
The right macro split should produce noticeable results within 2–4 weeks. For fat loss, you should see the scale trending downward by about 0.5–1% of body weight per week. For muscle gain, expect roughly half a pound to one pound per week if you’re relatively new to lifting, less if you’re experienced. If the scale isn’t moving in the direction you want after 2–3 consistent weeks, your total calories are the first thing to adjust, not your macro ratios.
Energy levels matter too. If your workouts feel flat and you’re struggling to recover, you may need more carbohydrates. If you’re constantly hungry between meals, adding more protein or fat (while staying within your calorie range) often helps. Macros aren’t a set-it-and-forget-it calculation. They’re a starting framework you refine based on how your body actually responds.