sorry, i'm an idiot, i must have been tired when i posted my post.
First of all, what is the extract %?
Next thing you'll need is a scale that measures to .01g.
You'll want to weigh out so that you have 150-250mg active.
So, if the extract is 50% for example(which i doubt, but easy to display math), you'd want to weigh out 300-500mg.
You would then want to cap it more than likely.
That would ensure more math though, i first want to know the extract % and if you have a scale.