How to convert chopped walnuts
Our reference is 113 grams per US reference cup of chopped walnuts, chopped walnuts; not whole walnut halves. That works out to about 0.4776 grams per millilitre, so cups = grams ÷ 113 and grams = cups × 113 in US customary measures.
For metric and Australian recipes the cup holds 250 ml, so one cup of chopped walnuts is about 119.41 grams. Australian tablespoons hold 20 ml rather than 15 ml, which the calculator handles when you pick that system.
Preparation changes the weight
The reference describes chopped walnuts as: chopped walnuts; not whole walnut halves. A different form, such as sifted, packed, melted, chopped or cooked, can hold a different weight in the same cup and needs its own reference. When a recipe gives a gram amount, weigh that amount instead of converting.
Brand, moisture and how firmly the cup is filled all move the practical result. Treat the numbers here as recipe equivalents, not laboratory densities.
Where the number comes from
The reference comes from King Arthur Baking ingredient weight chart, which lists 1 cup as 113 grams. Published recipe weight, normalised to one reference cup. This site assigns the published cup weight to its adopted US reference cup of 236.5882365 ml; the source itself does not define an exact millilitre cup volume. Checked September 25, 2026.