Which is cheaper for protein, canned tuna (in water) or sardines (canned in oil)?

Canned tuna (in water), at $0.042 per gram of protein against $0.055 for sardines (canned in oil) (July 2026 US grocery prices). A 30 g protein serving costs $1.27 vs $1.65.

Which has more protein per calorie, canned tuna (in water) or sardines (canned in oil)?

Canned tuna (in water), with 22.4 g protein per 100 kcal against 11.8 g for sardines (canned in oil), 1.9x leaner. That matters when you are cutting and calories are the binding constraint.

Which should I buy, canned tuna (in water) or sardines (canned in oil)?

Canned tuna (in water) wins on both axes here: cheaper per gram of protein and more protein per calorie. Unless taste, prep or the rest of your macros say otherwise, it is the better default.

Protein head-to-heads · July 2026

Canned tuna (in water) vs Sardines (canned in oil): which protein is cheaper?

USDA macros joined to current US grocery prices, reduced to the two numbers that decide it: dollars per gram of protein, and protein per calorie.

Canned tuna (in water) is 1.3x cheaper per gram of protein ($0.042/g vs $0.055/g), while it also carries more protein per calorie (22.4 g vs 11.8 g per 100 kcal), so it wins on both axes.

Food	$/g protein	30 g protein costs	You need	kcal that come with it	Protein/100 kcal
Canned tuna (in water)	$0.042	$1.27	115 g	134 kcal	22.4 g
Sardines (canned in oil)	$0.055	$1.65	122 g	254 kcal	11.8 g

Full macros, per serving

Food (per serving)	Price	kcal	Protein	Carbs	Fat
Canned tuna (in water) (100 g)	$1.10	116	26 g	0 g	1 g
Sardines (canned in oil) (100 g)	$1.35	208	24.6 g	0 g	11.4 g

A week of protein from each

Hitting a common 100 g/day protein target from canned tuna (in water) alone costs $29.62 a week; from sardines (canned in oil) alone, $38.41. That is a gap of $8.80 every week for the same protein. In practice you mix sources: the planner computes the cheapest mix for your exact target and calorie cap, live from the same dataset.

This one is not a trade-off

Canned tuna (in water) is both the cheaper protein ($0.042/g against $0.055/g) and the leaner one (22.4 g protein per 100 kcal against 11.8 g). Most matchups force you to pick a side. This one does not, so sardines (canned in oil) has to win on taste, prep time or what else it brings to the meal, because it is not winning on the numbers.

One of these is a convenience purchase

Sardines (canned in oil) ranks #22 of 25 on cost per gram of protein, near the bottom. It is not a bad food, it is an expensive way to buy protein: $1.65 per 30 g against $1.27 for canned tuna (in water). If it is in your basket for the protein, swap it. If it is there because it travels well or you enjoy it, that is a different and perfectly good reason.

Compare against other foods

Frequently asked

Which is cheaper for protein, canned tuna (in water) or sardines (canned in oil)?: Canned tuna (in water), at $0.042 per gram of protein against $0.055 for sardines (canned in oil) (July 2026 US grocery prices). A 30 g protein serving costs $1.27 vs $1.65.
Which has more protein per calorie, canned tuna (in water) or sardines (canned in oil)?: Canned tuna (in water), with 22.4 g protein per 100 kcal against 11.8 g for sardines (canned in oil), 1.9x leaner. That matters when you are cutting and calories are the binding constraint.
Which should I buy, canned tuna (in water) or sardines (canned in oil)?: Canned tuna (in water) wins on both axes here: cheaper per gram of protein and more protein per calorie. Unless taste, prep or the rest of your macros say otherwise, it is the better default.

Prices are representative US grocery prices as of July 2026; your store will differ. Educational content, not medical or dietary advice. Dataset: free download, CC-BY.