WellByNumbers.

Cheerios (plain) vs Corn flakes

Both count toward 30 plants a week.

Cheerios (plain)Corn flakes
Protein · per 100 g12.4 g5.9 g
Carbs · per 100 g73.2 g88.0 g
Fat · per 100 g6.6 g0.9 g
Fiber · per 100 g10.1 g2.7 g
Energy · per 100 g372.0 kcal384.0 kcal
Protein · per 100 kcal3.3 g1.5 g
To hit 30 g protein242 g · 900 kcal508 g · 1953 kcal

The same three numbers, drawn

Protein / 100 g12.45.9Fiber / 100 g10.12.7Protein / 100 kcal3.31.5CheeriosCorn flakes

What 30 g of protein looks like on a plate

242 gCheerios900 kcal rides along508 gCorn flakes1953 kcal rides alongsquare area drawn to scale · grams needed for 30 g protein

Where the calories come from

protein 12%carbs 73%fat 15%
6%carbs 92%2%

The one-line verdict: Cheerios (plain) delivers 2.2× the protein per calorie of Corn flakes (3.3 g vs 1.5 g per 100 kcal).

More protein / 100 g: CheeriosMore fiber / 100 g: CheeriosLighter per 100 g: CheeriosSmaller 30 g portion: Cheerios

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.