And you’re asking us after you’ve decided upon pot size? That’s easy enough math right?
New growers are often surprised to learn that it almost doesn’t matter. The equation of light to space to soil quantity to nutrient availability all make the formula for yield. Quantity of plants is irrelevant, provided the space is filled.
You’d never really grow this way, but 225 solo cups in your space would deliver the same yield as 4 massive plants in big pots, and in a lot less time! Does that make sense?
Pick your poison. Decide how long you want to veg. And if you’re growing auto, which you shouldn’t be, they don’t get huge so you’ll need plenty.
Best wishes and enjoy the process!