Oz of formula a day for a newborn

So I recently switched my 4 day old over to formula because I’m not producing enough just yet. So far my baby is eating between 1-2 oz every 2/3 hours. Not sure how many oz a newborn needs to be eating in a day since I’m a ftm and I always imagined myself breast feeding. My baby seems pretty satisfied with what we are giving him, but I certainly don’t want to starve him.