WellByNumbers.

Protein bar vs Whey protein (dry)

Protein barWhey protein (dry)
Protein · per 100 g30.3 g78.0 g
Carbs · per 100 g38.4 g8.0 g
Fat · per 100 g15.2 g6.0 g
Fiber · per 100 g7.3 g0.0 g
Energy · per 100 g412.0 kcal385 kcal
Protein · per 100 kcal7.4 g20.3 g
To hit 30 g protein99 g · 407 kcal38 g · 148 kcal

The same three numbers, drawn

Protein / 100 g30.378.0Fiber / 100 g7.30.0Protein / 100 kcal7.420.3Protein barWhey protein

What 30 g of protein looks like on a plate

99 gProtein bar407 kcal rides along38 gWhey protein148 kcal rides alongsquare area drawn to scale · grams needed for 30 g protein

Where the calories come from

protein 29%carbs 37%fat 33%
protein 78%carbs 8%fat 14%

The one-line verdict: Whey protein (dry) delivers 2.8× the protein per calorie of Protein bar (20.3 g vs 7.4 g per 100 kcal).

More protein / 100 g: Whey proteinMore fiber / 100 g: Protein barLighter per 100 g: Whey proteinSmaller 30 g portion: Whey protein

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.