What is a macro calculator?
A macro calculator takes the calories you plan to eat in a day and splits them into grams of protein, carbs, and fat. Calories tell you how much energy you eat. Macros tell you where that energy comes from, which shapes how full you feel, how your training goes, and how much muscle you keep while losing fat.
You pick a split (balanced, high protein, or low carb), and the tool returns the grams of each macronutrient plus the calories that macro contributes. If you do not have a calorie number yet, find it first with the TDEE calculator.
How it’s calculated
The math is short. Each macro carries a fixed amount of energy per gram. Protein and carbohydrate give about 4 calories per gram, and fat gives about 9. To turn a percentage of your calories into grams, take that share of your daily calories and divide by the macro’s calories per gram:
- Grams of a macro = (calories × percent ÷ 100) ÷ calories per gram
For example, on a 2,000 calorie day with a balanced split (30 percent protein), protein calories are 2,000 × 0.30 = 600, and 600 ÷ 4 gives 150 grams of protein. Here are the three splits this calculator offers:
| Split | Protein | Carbs | Fat |
|---|---|---|---|
| Balanced | 30% | 40% | 30% |
| High protein | 40% | 30% | 30% |
| Low carb | 40% | 20% | 40% |
Grams are rounded to whole numbers, so the calories add back up to roughly your target rather than exactly. That rounding is fine for planning meals.
Using macros to lose weight
Weight loss still comes down to a calorie deficit. Macros decide how comfortable that deficit feels. A higher protein share helps you stay full and hold onto muscle, which is why many weight-loss plans push protein up and let carbs or fat flex around it. Once you have your grams, the practical question is what to eat to hit them. Our calorie-counted meal plans are built around protein-forward days, so you can pick one near your target and skip the math.
Frequently asked questions
What are macros?
Macros are the three macronutrients that supply the calories in your food: protein, carbohydrates, and fat. Protein and carbs each give about 4 calories per gram, and fat gives about 9. When people talk about hitting their macros, they mean eating a set amount of grams of each one to match a calorie target and a goal like fat loss or muscle gain.
How do I calculate my macros?
Start with your daily calorie target, then split those calories by percentage across protein, carbs, and fat. Convert each percentage to grams by dividing its share of calories by the energy per gram (4 for protein, 4 for carbs, 9 for fat). This calculator does that math for you once you enter your calories and pick a split.
What macro split is best for weight loss?
For weight loss, a higher-protein split tends to help, because protein keeps you full and protects muscle while you are in a calorie deficit. A common choice is around 40 percent protein with the rest divided between carbs and fat. The split matters less than staying under your calorie target, so pick one you can actually eat day to day.
Plans and guides
Now that you have your grams, here’s where to put them to work.
Keep going: find your calories with the TDEE calculator, set a protein goal with the protein calculator, or check your BMI.