If using large tile I would lay it all out to scale on a floor plan drawing so you can determine where to center the tile along the length and along the width for the best layout. And be prepared for a lot of waste. In a 5 foot wide room it may make the most sense to have a full tile down the middle with an 18" tile down each side. That means that 2 out of every 3 tiles will have unusable waste with that particular layout.

@everdebz did you do 6x24 on the entire floor? im looking to do larger tiles to avoid having to clean grout.

IMO use 12 x24 on the floor and the shower walls but you need to rethink a 30" shower if not just atub/ shower . I use a stacked tile pattern in small spaces . If you reall want help we need a to scale floor plan and some pictures too.

My daughter’s hall bathroom is 61” wide and only 76” long plus a tub alcove. She used 24” square tiles on her floor and 12x24” on the tub walls.

Maybe these pics will help you envision what you those size tiles will look like in your bathroom

@badgergal thank you so much. the bathrooom looks great.