How many grams is 1 tablespoon of coriander seeds?

1 tablespoon of coriander seeds (coriander seed) weighs

That's 0.2oz. An Australian 20ml tablespoon holds 6.8g.

A level US or UK tablespoon (15ml).

Other amounts of coriander seeds

Full table for coriander seeds

Where these numbers come from

USDA FoodData Central, SR Legacy, food 02013: “Spices, coriander seed”. USDA lists these household measures for it:

1 tsp = 1.8g
1 tbsp = 5g

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