Hi yeah, looking at google I have found -
What size is the animation grid in RPG Maker MV?
The format for animations is 192x192 pixels per cell, with a maximum of five cells in a row - resulting in 5*192 = 960 for the width. The length/height of the animation cell can be varied in multiples of 192 as well - 576 are three rows, but you could make it 768 or 960 for more cells as well.