How many grams are in a cup of walnuts?

A cup of chopped walnuts is about 120 grams. Whole or halved walnuts can weigh slightly less per cup because larger pieces leave more air gaps.

Does this figure apply to walnut halves or whole walnuts?

This tool uses the density for chopped walnuts. Walnut halves pack less densely by volume, so a cup of halves typically weighs a bit less than 120 grams.

Is this the same as a US cup or a metric cup?

This tool uses the US cup (236.6 ml). A metric cup (250 ml) would give a slightly higher gram result.

Can I convert grams back to cups?

Yes. Divide your gram amount by 120 to get the equivalent number of cups of chopped walnuts.

Why measure walnuts by weight instead of cups?

Chopped walnuts settle differently depending on piece size and how firmly they are packed into the cup, so weight gives a more repeatable result across attempts.

Walnuts Cups to Grams

Enter a number of cups of chopped walnuts to get the weight in grams.

Walnuts Converter

Amount in Cups (chopped walnuts)

Result

120 g

≈ 4.2 oz

Quick Reference Table

Cups	Grams (chopped walnuts)

Values use 120 grams per cup for chopped walnuts, measured by US cup (236.6 ml). Walnut halves or whole walnuts can weigh slightly less per cup.

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Summary

Chopped walnuts are commonly measured by volume in US recipes, but baking results are more consistent by weight. This tool converts any cup amount to grams using 120 grams per cup for chopped walnuts, a commonly cited baking-reference figure, and includes a quick table for typical measurements so you do not need to run the math by hand.

How it works

Enter the number of cups of chopped walnuts you want to convert.
The tool multiplies that amount by 120 grams per cup.
The gram weight and ounce equivalent update instantly.
Use the reference table for common cup amounts.

Use cases

Scale a recipe written in cups to a kitchen scale in grams.
Convert a US recipe to metric for baking outside the US.
Check how much a bag of chopped walnuts weighs before buying.
Portion out walnuts by weight for meal prep or baking.

Frequently Asked Questions

Last updated: 2026-09-09 · Reviewed by Nham Vu