The doser will measure grinds out at 7 grams at a time. This is enough for one espresso shot. This is a fixed number you can not adjust the amount in each dose. However, I don't really use the doser for "measuring", I pull the doser handle until I have enough coffee to fill the basket just below the top. I scrape off any excess back into the doser for the next shot. The Non-doser version of the Rancilio Rocky is a popular seller that just directs the ground coffee into the filter basket.