How many cups is 200g of red lentils (dried)?

200g of red lentils (dried) (red lentils) is

1 cup + 1 tbsp

That's 1.04 US cups, 0.99 metric cups, or 17 level tablespoons.

Worked out from 1 US cup = 192g. 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 red lentils (dried)

100g: ½ cup
250g: 1¼ cups + 1 tbsp
1 cup: 192g
Half a cup: 96g
A quarter cup: 48g
1 tablespoon: 12g
Full table for red lentils (dried)

Where these numbers come from

USDA FoodData Central, SR Legacy, food 16144: “Lentils, pink or red, raw”. USDA lists these household measures for it:

1 cup = 192g

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.