The short answer
The 10:1 rule is a fast way to spot protein-forward snacks: divide calories by 10; protein grams at or above that number pass.
Use it in the aisle
A 150-calorie snack needs about 15 grams of protein. Greek yogurt, cottage cheese, tuna pouches, edamame and some protein shakes often qualify—check the serving on the label.
Keep the shortcut in its lane
This is not an official nutrition rule or a score for overall health. Fiber, added sugar, sodium, ingredients, cost and what keeps you satisfied still matter.