How much spinach should I use for juicing?

I’m new to juicing and looking for some advice. I’ve been trying out different recipes I found online before making my own. One of them calls for half a cup of spinach. Does that mean loose leaves or 4 ounces of spinach?

I don’t measure exactly. I just throw in a bunch and expect to get very little juice from it.

I just add enough until it looks right.

Spinach and grapes together taste great.

Half a cup refers to volume, not weight.

Fin said:
Half a cup refers to volume, not weight.

That’s what I thought, thanks.