Southwire has a nice calculator for conduit capacity. I wouldn't pull and x/2 or x/3 wire through a conduit, that's what THHN is for except in very special and specific circumstances.
I'm only pulling 12 gauge. It shouldn't be a problem for the 75 watts or less that will be used out there. If I was building a shop and welding out there then maybe, but a light, camera, and a fan is all I'm after.
Southwire has a nice calculator for conduit capacity. I wouldn't pull and x/2 or x/3 wire through a conduit, that's what THHN is for except in very special and specific circumstances.