Calories in corn flakes
Calories, protein, carbohydrate and fat per 100 g and per serving, from the USDA reference database — plus what actually changes the number on your plate.
Short answer
100 g of corn flakes contains 384 kcal, with 5.9 g of protein, 88 g of carbohydrate and 0.9 g of fat.
A typical serving — 1 cup, about 28 g — is roughly 108 kcal.
That is a fairly calorie-dense food, so portion size matters.
Nutrition facts
| Nutrient | Per 100 g | 1 cup (28 g) |
|---|---|---|
| Calories | 384 kcal | 108 kcal |
| Protein | 5.9 g | 1.7 g |
| Carbohydrates | 88 g | 24.6 g |
| Sugars | 7.8 g | 2.2 g |
| Fibre | 2.7 g | 0.8 g |
| Fat | 0.9 g | 0.3 g |
| Saturated fat | 0.2 g | 0.1 g |
| Cholesterol | 0 mg | 0 mg |
| Sodium | 571 mg | 160 mg |
| Potassium | 107 mg | 30 mg |
| Calcium | 2 mg | 1 mg |
| Iron | 19.4 mg | 5.4 mg |
| Vitamin C | 65 mg | 18.2 mg |
| Water | 3 g | 1 g |
Calories per serving
| Serving | Weight | Calories | Protein | Carbohydrates | Fat |
|---|---|---|---|---|---|
| 1 cup | 28 g | 108 | 1.7 g | 24.6 g | 0.3 g |
| 1 serving | 30 g | 115 | 1.8 g | 26.4 g | 0.3 g |
Photograph it instead of looking it up
Wellix identifies corn flakes on your plate, estimates the portion and logs calories, protein, carbs and fat in seconds. Free to start on iPhone and Android.
Calories by weight
Use this table when you know the weight but not the serving:
| Amount | Calories | Protein | Carbohydrates | Fat |
|---|---|---|---|---|
| 25 g | 96 | 1.5 g | 22 g | 0.2 g |
| 50 g | 192 | 3 g | 44 g | 0.5 g |
| 100 g | 384 | 5.9 g | 88 g | 0.9 g |
| 150 g | 576 | 8.9 g | 132 g | 1.4 g |
| 200 g | 768 | 11.8 g | 176 g | 1.8 g |
| 250 g | 960 | 14.8 g | 220 g | 2.3 g |
| 300 g | 1,152 | 17.7 g | 264 g | 2.7 g |
Where the calories come from
Calories come from three macronutrients: protein and carbohydrate at 4 kcal per gram, fat at 9 kcal per gram. For corn flakes the split is:
- Protein: 5.9 g × 4 = 24 kcal — 6% of calories
- Carbohydrates: 88 g × 4 = 352 kcal — 92% of calories
- Fat: 0.9 g × 9 = 8 kcal — 2% of calories
- Most of the energy in corn flakes comes from carbohydrate (92% of calories).
- For 200 kcal you can eat about 50 g.
What actually changes the number
Corn flakes are 384 kcal per 100 g but light — a 30 g serving is 115 kcal. The realistic bowl people pour is 50–60 g, plus 150 ml of milk, so 280–300 kcal.
How accurate are these numbers?
The values on this page are reference averages from the USDA FoodData Central database (SR Legacy release), measured on samples of corn flakes as sold and prepared in the United States. Your portion will differ: produce varies by variety and ripeness, meat by cut and trim, and anything cooked by the fat and water it gained or lost.
For most foods the per-100 g figure is reliable to within about 10%. The larger uncertainty is almost always the weight of what is on your plate and the cooking fat you cannot see — the two things worth checking before you worry about the database.
How accurate are AI calorie counting apps? →
Related foods
More in Grains, rice, pasta and bread →
Frequently asked questions
How many calories are in 100 g of corn flakes?
100 g of corn flakes contains 384 kcal (5.9 g protein, 88 g carbohydrate, 0.9 g fat), according to USDA reference data.
How many calories are in a serving of corn flakes?
A typical serving of corn flakes — 1 cup, about 28 g — has roughly 108 kcal. Weigh your own portion once to see how it compares; serving sizes vary more than the food does.
How much protein is in corn flakes?
Corn flakes: 5.9 g of protein per 100 g, which is low. Foods above about 15–20 g per 100 g, or where protein supplies a third or more of the calories, are usually considered high-protein.
What amount of corn flakes equals 200 kcal?
At 384 kcal per 100 g, about 50 g of corn flakes equals 200 kcal.
Can I track corn flakes by taking a photo?
Yes. A photo calorie app like Wellix identifies corn flakes on the plate and estimates the portion from the image. The estimate is most accurate when you confirm the weight or the count, and tell the app about anything the camera cannot see — cooking oil, butter, dressings and sauces.
Source
Nutrition data: U.S. Department of Agriculture, FoodData Central — SR Legacy, FDC ID 174648: "Cereals ready-to-eat, RALSTON Corn Flakes". Values are per 100 g of edible portion. Serving weights are USDA household measures or typical retail sizes; check the label where one exists. View the USDA record.
Wellix provides general nutrition information and is not medical advice. Nutrition values are reference averages and individual foods vary. Consult a qualified healthcare professional before making significant dietary changes.
Photograph it instead of looking it up
Wellix identifies corn flakes on your plate, estimates the portion and logs calories, protein, carbs and fat in seconds. Free to start on iPhone and Android.
