This entry describes walnuts measured after chopping. A recipe that measures whole walnuts and then chops them should keep that different sequence instead of silently using the chopped-volume relationship.
Read the preparation order
Keep the complete ingredient line. “A cup of chopped walnuts” and “a cup of walnuts, chopped” can communicate different measuring steps. If the recipe remains ambiguous, preserve its wording for review.
The available records do not quantify chop size. They are not a validated relationship for whole walnuts or finely ground walnut meal.
Inspect the chart or recipe reference
King Arthur provides a chopped-walnut chart relationship. The Women’s Weekly Food reference comes from a date-and-walnut loaf recipe that pairs a chopped-walnut measure with a weight and establishes its cup volume.
A recipe reference remains tied to that stated preparation. It should not be presented as a laboratory measurement covering every chopping style.
Use an original weight when supplied
If your recipe already gives grams of walnuts, scale those grams and keep chopping as a separate instruction. No nut density is needed for that serving change.
Keep chopped walnuts separate from chopped almonds in shopping totals. Buying similar pieces does not make the ingredients or their reference values interchangeable.