Health calculator
Macro Calculator by Calories, Protein, Carbs and Fat
Calculate protein, carbohydrate, and fat gram targets from daily calories, macro percentages, direct protein grams, or grams per kilogram body weight.
FormulaProtein grams = protein calories / 4; carbs grams = carb calories / 4; fat grams = remaining calories / 9
Formula
Macro calorie conversion
Macro targets are planning estimates and should not replace nutrition or medical guidance.
Protein grams = protein calories / 4; carbs grams = carb calories / 4; fat grams = remaining calories / 9
2,000 kcal at 30% protein and 40% carbs gives 150 g protein, 200 g carbs, and about 66.7 g fat.
SourcesThis calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.
Sources and assumptions
Source notes
This calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.
- Effective year
- Current rules
- Last verified
- 2026-06-18
Macro targets are planning estimates and should not replace nutrition or medical guidance.
Official and reference sources
Assumptions
- Protein and carbohydrate are converted at 4 kcal per gram.
- Fat is converted at 9 kcal per gram.
- When protein is entered by body weight, the body-weight input is treated as kilograms.
Not included
- Fiber-specific calorie adjustments, alcohol calories, micronutrients, meal timing, allergies, medical diets, and individualized clinical nutrition.
FAQ7 common questions for this calculator.
FAQs
How do I calculate macros from calories?+
Choose daily calories, set protein and carbohydrate targets, and the calculator assigns the remaining calories to fat using 4 kcal/g for protein and carbs and 9 kcal/g for fat.
Can I use grams per kilogram for protein?+
Yes. Select the g per kg protein option, enter body weight in kilograms, and set the grams-per-kilogram target.
Are macro targets medical advice?+
No. They are planning estimates and should be adjusted for goals, training, preferences, and health needs.
How does the Macro Calculator calculate the result?+
For the Macro Calculator, it uses the Macro calorie conversion: Protein grams = protein calories / 4; carbs grams = carb calories / 4; fat grams = remaining calories / 9. 2,000 kcal at 30% protein and 40% carbs gives 150 g protein, 200 g carbs, and about 66.7 g fat.
What information do I need to use the Macro Calculator?+
Enter daily calories and the protein, carbohydrate, and fat split you want to test. Keep the percentages aligned to your nutrition target before comparing gram totals.
How accurate is the Macro Calculator?+
Macro results are accurate for the calorie target and percentage split you enter. Real meal plans can differ because food labels are rounded, cooked weights change, and fiber or alcohol may be tracked differently.
What should I check before using the Macro Calculator result?+
Check that protein, carbohydrate, and fat percentages reflect your target and that they make sense against total calories. Compare gram targets with food labels or a nutrition plan before using them daily.
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Health guide
How to use the Macro Calculator
Calculate protein, carbohydrate, and fat gram targets from daily calories, macro percentages, direct protein grams, or grams per kilogram body weight. The page also explains the macro calorie conversion and shows a practical example: 2,000 kcal at 30% protein and 40% carbs gives 150 g protein, 200 g carbs, and about 66.7 g fat.
- 1
Enter your details
Enter daily calories, macro percentages, direct protein grams, or grams per kilogram body weight, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the macro calorie conversion: Protein grams = protein calories / 4; carbs grams = carb calories / 4; fat grams = remaining calories / 9.
- 3
Compare scenarios
Change one or more inputs to see how they affect the macro Calculator result before you use the estimate.
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