when i make butter, 16 ounces (4 sticks) of butter usually yields about 4 ounces (1 stick) of cannabutter. the amount of weed to add is up to you. for reference, when i did do on the fly brownies, muffins or cookies, i usually did 1/2 ounce of weed to whatever amount of butter or oil was called for.

it all depends on how potent u want it.