Cups of walnuts to grams

What the sources say about a cup of walnuts

Two published sources, side by side. Where a source lists several forms or ways of measuring, each is a row.

Spread across sources: 4% between USDA and King Arthur for the main entry. Ingredient weights vary by brand, packing and humidity; the table is a reference, not a guarantee.

Why this number: 113 g per US cup

We use King Arthur's published figure, which is a stated reference for home bakers and is the weight most gram-based recipes from that source use. Where the two sources disagree, both figures are in the table above and in the calculator, so you can switch to the one your recipe was written with.

Walnuts are a clean example of preparation changing the cup: USDA gives 117 g chopped, 120 g for pieces, 100 g for halves and 80 g ground. King Arthur lists chopped at 113 g. The same nuts weigh up to 50% more per cup depending on how finely they have been cut.

King Arthur lists whole walnuts as 64 g for half a cup (128 g a cup), a little higher than USDA's 100 g for halves, possibly because of how the nuts are packed or what counts as whole; neither source says. If a recipe says "1 cup walnuts" without a form, assume chopped.

Toasting reduces weight slightly (moisture loss); the figures here are for raw nuts.

Cups of walnuts to grams chart

Grams of walnuts to cups

US cup, metric cup and spoons

One US cup of walnuts at our default weight is 113 g. A 250 ml metric cup, used in Australia, New Zealand, Canada and many metric recipes, holds the same volume plus 5.7%, which is 119 g. A US legal (nutrition label) cup of 240 ml is 115 g. These all assume the same packing as the US cup; read about it on US cup vs metric cup.

Sources and when they were checked

• USDA FoodData Central, SR Legacy (April 2018 release), food Nuts, walnuts, english (FDC ID 170187). Gram weights per household measure as published; per-cup figures where USDA lists a different amount (such as 2 tablespoons) are scaled.
• King Arthur Baking, Ingredient Weight Chart, row(s): Walnuts (chopped), Walnuts (whole). Chart rows that list a quarter cup, half cup or tablespoon are scaled to a full cup on this page; the original listing is shown in the table above.
• Cup volumes: the US customary cup is exactly 236.5882365 ml; the US nutrition-label cup is defined in US law as 240 ml (21 CFR 101.9); the metric cup is 250 ml (see US cup vs metric cup).

Last checked 27 October 2026. Weights are for reference: ingredients vary by brand, humidity and how they are packed. If your recipe gives gram weights, use those.

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