Food Calorie Calculator
A food’s calories come from its macronutrients. Enter the grams of carbs, protein, fat and any alcohol to get the total calories and where they come from, using the Atwater factors.
Your numbers
Result
- From carbskcal
- 200
- From proteinkcal
- 80
- From fatkcal
- 135
| Macronutrient | Calories | Share |
|---|---|---|
| Carbs (4 kcal/g) | 200 | 48% |
| Protein (4 kcal/g) | 80 | 19% |
| Fat (9 kcal/g) | 135 | 33% |
| Alcohol (7 kcal/g) | 0 | 0% |
The Atwater factors
Each macronutrient supplies a set number of calories per gram: carbs and protein 4 kcal/g, fat 9 kcal/g, and alcohol 7 kcal/g. Total calories are the sum. For 50 g carbs, 20 g protein and 15 g fat: 50x4 + 20x4 + 15x9 = 200 + 80 + 135 = 415 kcal.
Why fat looks calorie-dense
Fat packs more than twice the calories of carbs or protein per gram, so a small amount adds up fast. That is why cooking oils and nuts are calorie-dense. Reading a label, you can check the math: multiply each macro by its factor and the totals should roughly match the stated calories.
Informational and educational result. Not a substitute for professional advice.
Frequently asked questions
Sources
- Atwater general factors (energy per gram of macronutrient)
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