100 ml of soy sauce contains 15~ 17 g of sodium chloride-that is, 2 g of salt is about 0.3~0.34 ml of soy sauce.

A spoonful of soy sauce is about 10g.

Gram and milliliter are two units of measurement with different physical properties. Gram is the unit of mass, and milliliter is the unit of volume. If you want to compare these two units, you need to connect and transform them with the density of the object, because the volume multiplied by the density equals the volume. For example, the density of water is one gram per milliliter, so one gram of water is equal to one millilitre of water.

Three spoonfuls of soy sauce is about 30 grams. Assuming that the density of soy sauce and water is roughly similar, 30 grams of soy sauce is about 30 ml. According to the conversion, 30 ml of soy sauce is about 200 grams of salt.