How many cups is 200g of pistachios (shelled)?

200g of pistachios (shelled) (shelled pistachios) is

1½ cups + 2 tbsp

That's 1.63 US cups, 1.54 metric cups, or 26 level tablespoons.

Worked out from 1 US cup = 123g. Cups are rounded to the nearest kitchen fraction, with what's left over in level tablespoons. If you have scales, weighing is more accurate.

Other amounts of pistachios (shelled)

Where these numbers come from

USDA FoodData Central, SR Legacy, food 12151: “Nuts, pistachio nuts, raw”. USDA lists these household measures for it:

1 cup = 123g
1 oz (49 kernels) = 28.35g
1 kernel = 0.7g

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.