How many cups is 250g of dried milk powder?

250g of dried milk powder (dry whole milk) is

1¾ cups + 3 tbsp

That's 1.95 US cups, 1.85 metric cups, or 31 level tablespoons.

Worked out from 1 US cup = 128g. 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 dried milk powder

100g: ¾ cup + 1 tbsp
200g: 1½ cups + 1 tbsp
1 cup: 128g
Half a cup: 64g
A quarter cup: 32g
1 tablespoon: 8g
Full table for dried milk powder

Where these numbers come from

USDA FoodData Central, SR Legacy, food 01212: “Milk, dry, whole, without added vitamin D”. USDA lists these household measures for it:

1 cup = 128g
0.25 cup = 32g

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.