How much is 400 mg of coffee?

It's not possible to determine the amount of coffee in "400 mg" because that measurement refers to weight (milligrams), not volume.

To understand how much coffee 400 mg is, we need more information:

* Type of coffee: Is it ground coffee, instant coffee, or coffee beans?

* Brewing method: How is the coffee being brewed? Different methods use different amounts of coffee.

Here's how to think about it:

* 400 mg is a very small amount of coffee. A typical cup of brewed coffee contains around 100-200 milligrams of caffeine, and 400 mg would be equivalent to just a small fraction of a cup.

* Coffee is usually measured by volume, not weight. For example, you might use 1 tablespoon of ground coffee or a single coffee pod.

To get a better idea of how much coffee 400 mg is, you would need to:

1. Specify the type of coffee.

2. Provide details about the brewing method.

With this information, you could then calculate the approximate volume of coffee that contains 400 mg of caffeine.