WellByNumbers.

Sardines (canned, drained) vs Canned tuna (in water)

Sardines (canned, drained)Canned tuna (in water)
Protein · per 100 g24.6 g25.5 g
Carbs · per 100 g0.0 g0.0 g
Fat · per 100 g11.4 g0.8 g
Fiber · per 100 g0.0 g0.0 g
Energy · per 100 g208.0 kcal116.0 kcal
Protein · per 100 kcal11.8 g22.0 g
To hit 30 g protein122 g · 253 kcal118 g · 136 kcal

The same three numbers, drawn

Protein / 100 g24.625.5Fiber / 100 g0.00.0Protein / 100 kcal11.822.0SardinesCanned tuna

What 30 g of protein looks like on a plate

122 gSardines253 kcal rides along118 gCanned tuna136 kcal rides alongsquare area drawn to scale · grams needed for 30 g protein

Where the calories come from

protein 49%fat 51%
protein 93%fat 7%

The one-line verdict: Canned tuna (in water) delivers 1.9× the protein per calorie of Sardines (canned, drained) (22.0 g vs 11.8 g per 100 kcal).

More protein / 100 g: Canned tunaLighter per 100 g: Canned tunaSmaller 30 g portion: Canned tuna

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.