How many cups is 250g of dutch-process cocoa?

250g of dutch-process cocoa is

2¾ cups + 3 tbsp

That's 2.91 US cups, 2.75 metric cups, or 46 level tablespoons.

Worked out from 1 US cup = 86g. 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 dutch-process cocoa

100g: 1 cup + 3 tbsp
200g: 2⅓ cups
1 cup: 86g
Half a cup: 43g
A quarter cup: 22g
1 tablespoon: 5.4g
Full table for dutch-process cocoa

Where these numbers come from

USDA FoodData Central, SR Legacy, food 19166: “Cocoa, dry powder, unsweetened, processed with alkali”. USDA lists these household measures for it:

1 cup = 86g
1 tbsp = 5.4g

Fractions of a cup are the cup weight scaled down. 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.