WellByNumbers.

Corn flakes vs Rolled oats (dry)

Both count toward 30 plants a week.

Corn flakesRolled oats (dry)
Protein · per 100 g5.9 g13.5 g
Carbs · per 100 g88.0 g68.7 g
Fat · per 100 g0.9 g5.9 g
Fiber · per 100 g2.7 g10.1 g
Energy · per 100 g384.0 kcal379 kcal
Protein · per 100 kcal1.5 g3.6 g
To hit 30 g protein508 g · 1953 kcal222 g · 842 kcal

The same three numbers, drawn

Protein / 100 g5.913.5Fiber / 100 g2.710.1Protein / 100 kcal1.53.6Corn flakesRolled oats

What 30 g of protein looks like on a plate

508 gCorn flakes1953 kcal rides along222 gRolled oats842 kcal rides alongsquare area drawn to scale · grams needed for 30 g protein

Where the calories come from

6%carbs 92%2%
protein 14%carbs 72%fat 14%

The one-line verdict: Rolled oats (dry) delivers 2.3× the protein per calorie of Corn flakes (3.6 g vs 1.5 g per 100 kcal).

More protein / 100 g: Rolled oatsMore fiber / 100 g: Rolled oatsLighter per 100 g: Rolled oatsSmaller 30 g portion: Rolled oats

Swap in your own pair

Bold marks the better side of each row. "Per 100 kcal" answers the density question — which food delivers more protein for the energy it costs. Portion row is computed live from the same USDA base values shown on each food page.