Double Double Burger w/ Onion vs Double ShackBurger

Cult-burger coast vs coast: West Coast legend against the East Coast challenger.

In-N-Out Burger

Double Double Burger w/ Onion

37gprotein

670calories

39gcarbs

41gfat

Source: In-N-Out Burger menu (via MenuStat) · vintage 2018 · 330 g

Shake Shack

Double ShackBurger

51gprotein

760calories

27gcarbs

48gfat

Source: Shake Shack website · vintage 2026

The verdict

Most protein

Double ShackBurger

51g vs 37g — a 14g gap

Fewest calories

Double Double Burger w/ Onion

670 vs 760 cal — 90 fewer

Best protein per 100 cal

Double ShackBurger

6.7g vs 5.5g

Least fat

Double Double Burger w/ Onion

41g vs 48g

More protein isn't automatically the better pick — it depends on your goals. Numbers are the chains' own published figures; vintages differ, so treat older ones as a guide.

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