It doesn't matter if it's exact, it all equals out. The point of taking them is to saturate your body over time with Finasteride and it only works when taken like that. I've screwed up a lot of times and cut some pills wrong to where I take a bit too much on one day and less on another but when that happens I just take the large portion, then the small one, then the large, then the small and it equals out in the end.