Calories in Cornflakes
Per 1 cup, 28 g
Cornflakes have 101 calories per 1 cup, 28 g. That is about 5% of a 2,000-calorie day. The same serving provides 2.1 g of protein, 24.0 g of carbohydrate, 0.1 g of fat and 0.8 g of fibre. Per 100 g, that works out at 361 calories and 7.5 g of protein. Against the thresholds EU food labelling uses, they qualify as fat free. Very little fibre and not very filling — the milk usually does more work than the cereal.
Calories and macros
| Per 1 cup, 28 g | Serving | Per 100 g | % of daily intake |
|---|---|---|---|
| Calories | 101 kcal | 361 kcal | 5% |
| Protein | 2.1 g | 7.5 g | 4% |
| Carbohydrate | 24.0 g | 85.7 g | 9% |
| Fat | 0.1 g | 0.4 g | 0% |
| Fibre | 0.8 g | 2.9 g | 3% |
Daily intake percentages use the EU reference intakes an average adult label is based on: 2,000 kcal, 50 g protein, 260 g carbohydrate, 70 g fat, 30 g fibre.
What this is good for
These are the nutrition claims this food would qualify for under EU labelling rules — thresholds, not opinions.
Worth knowing
Figures are for a typical example and will vary by brand, ripeness and how it was cooked. For a target of your own, run the calorie calculator or take the short quiz. To log this without doing the arithmetic, Joules is free.
Figures last reviewed 29 August 2026.
Common questions about cornflakes
How many calories are in cornflakes?
Cornflakes have 101 calories per 1 cup, 28 g, which is about 5% of a 2,000-calorie day.
How many calories are in 100 g of cornflakes?
100 g of cornflakes contains 361 calories.
How much protein is in cornflakes?
One serving of 1 cup, 28 g provides 2.1 g of protein — 7.5 g per 100 g, or 4% of the 50 g daily reference intake.
How many carbs are in cornflakes?
One serving of 1 cup, 28 g contains 24.0 g of carbohydrate, of which 0.8 g is fibre.
What are cornflakes a good source of?
Measured against EU food labelling thresholds, cornflakes qualify as fat free. Under 0.5 g of fat per 100 g.