My old recipe for buckeyes (cookies) calls for one package of crackers. That was when the box was a pound box. Does anyone know the conversion since the box is now less weight and less crackers?
Just divide one pound (16 ounces) by the weight of the box you have now. For example, if the new box is 14.4 ounces (seems to be a common size for graham crackers), then you need 16/14.4 = 1.11 boxes.
You might find Google helpful for this kind of thing: you can search for 1 pounds / 14.4 ounces and get an answer.
In the end you're probably best off just weighing, though: get enough boxes to have more than a pound, then weigh out a pound.
Or... if you're in exactly this situation, with a 14.4 ounce box that contains 3 packages of 9 crackers each, then that 0.11 of a box is an extra three crackers (27 * 16 / 14.4 = 30).