Macro Calculator
The macro calculator splits your daily calorie target into protein, carbohydrate, and fat grams based on your fitness goal. Supports cutting, bulking, maintaining, and ketogenic diet ratios. Visual breakdown of your macronutrient split. Free, no account required.
How to use Macro Calculator
- Enter your daily calorie target in the input field.
- Select a diet preset: balanced, low fat, low carb, high protein, keto, or custom.
- The daily gram targets for protein, carbohydrates, and fat calculate instantly.
- If you choose custom, adjust each ratio slider until the total reaches 100%.
- Copy or note your targets for your nutrition tracking app.
Macronutrient calculator: protein, carbs, and fat ratios by goal
The macronutrient calculator converts your daily calorie target into grams of protein, carbohydrate, and fat. Each macronutrient provides a fixed energy density: protein and carbohydrate each provide 4 calories per gram, and fat provides 9 calories per gram. To calculate macro grams: multiply your total daily calories by the percentage allocated to each macro, then divide by the calorie density for that macro. The calculator performs this calculation automatically for the goal you select.
Standard macro ratios by goal: For cutting (fat loss), 40% protein, 35% carbohydrate, 25% fat. This high-protein approach preserves lean muscle during a calorie deficit. For maintaining, 30% protein, 40% carbohydrate, 30% fat. For bulking (muscle gain), 25–30% protein, 50% carbohydrate, 20–25% fat. Higher carbohydrate supports training performance and glycogen replenishment. For keto, 5% carbohydrate, 25% protein, 70% fat. This ratio induces nutritional ketosis by limiting carbohydrate to approximately 20–50g per day.
Protein calculator daily: how much protein you actually need
Protein is the most important macro to get right, especially when dieting. It is the only macronutrient that directly supports muscle protein synthesis. The protein calculator daily target is based on body weight: for muscle building or maintenance during a cut, 1.6 to 2.2 grams of protein per kilogram of body weight per day is the evidence-based range supported by sports nutrition research. For sedentary adults, the RDA of 0.8g per kg is sufficient, but this is a floor, not an optimal target for people who exercise.
Macros for fat loss require prioritizing protein over the other two macros. When in a calorie deficit, higher protein intake reduces the proportion of weight lost from muscle. This is called the protein-sparing effect. Aiming for 2g of protein per kg of body weight while cutting effectively protects lean mass. The keto macro calculator ratio restricts carbohydrate to 5 percent of total calories, which shifts energy dependence toward fat oxidation and dietary fat, making fat the dominant calorie source at 70 percent.
Frequently asked questions
Macros (macronutrients) are the three main classes of nutrients that provide energy: protein, carbohydrate, and fat. Total calorie intake determines whether you gain, lose, or maintain weight. But the ratio of macros within those calories determines what kind of weight you gain or lose, muscle or fat, and how well your body performs and recovers. Tracking macros rather than just calories gives you more precise control over body composition.
To build muscle, the research-supported range is 1.6 to 2.2 grams of protein per kilogram of body weight per day. A 75 kg person would target 120 to 165 grams of protein per day. Higher protein intakes (up to 3g per kg) have been studied in athletes during aggressive cuts without producing additional muscle-building benefits, but they do help prevent muscle loss. For practical purposes, aiming for 2g per kg is a well-supported target for most people engaged in resistance training.
A standard ketogenic diet uses a macro ratio of approximately 5% carbohydrate, 25% protein, and 70% fat. For a person eating 2,000 calories per day, this translates to 25g of carbohydrate, 125g of protein, and 155g of fat. The strict carbohydrate limit (typically 20–50g per day) is what induces nutritional ketosis, the metabolic state where the body produces ketones from fat as the primary fuel source. The keto macro calculator field in this tool automatically applies this ratio when you select the ketogenic goal.
For most people starting out, tracking total calories is simpler and produces good results. As you advance, adding protein tracking, the most important single macro, provides significant additional benefit for body composition. Full macro tracking (all three macros) is most valuable for athletes, individuals with specific body composition goals, and those following structured diets like keto. If you are new to nutrition tracking, start with calories and protein, then add carbs and fat tracking once those habits are established.