How many grams is 1 tablespoon of chopped walnuts?

1 tablespoon of chopped walnuts weighs

7.3g

That's 0.3oz. An Australian 20ml tablespoon holds 9.9g.

A level US or UK tablespoon (15ml). USDA doesn't measure a tablespoon of this, so this is a sixteenth of its cup weight.

Other amounts of chopped walnuts

Where these numbers come from

USDA FoodData Central, SR Legacy, food 12155: “Nuts, walnuts, english”. USDA lists these household measures for it:

1 cup, chopped = 117g
1 cup, ground = 80g
1 cup, in shell, edible yield (7 nuts) = 28g
1 cup shelled (50 halves) = 100g
1 cup pieces or chips = 120g
1 oz (14 halves) = 28.35g

Fractions of a cup are the cup weight scaled down. The tablespoon figure is the cup weight divided by 16, since USDA doesn't list a tablespoon for this ingredient. The teaspoon is a third of the tablespoon. Metric-cup figures assume a 250ml cup, and Australian tablespoons hold 20ml. Weights under 10g are rounded to 0.1g, everything else to the nearest gram. Full source list.