I do not know what number of cells the A4 has. I suppose there are just a few frequent ones. Yet, you may even think about a customized grid in your explicit wants.
And I do not know the way large would you like the outcome to be on display. Keep in thoughts that that is additionally associated to the pixel decision, display dimension, and scaling.
So, you see, I can’t prescribe you a quantity.
But you do know. You have the A4 paper in query, and the scale on display is so that you can resolve.
Thus: make an A4 value of pixels at one to 1 ratio. Then examine it with the scale you need. If it’s a good outcome, then that is it.
If it is not, then you may resolve if you will use a special ratio primarily based on the scale comparability between what you need and what you bought. Or if you will use the one to 1 ratio however scale the outcome afterwards through software program.
And in case you are but to provide the drawings in paper, then you may think about printing a customized grid. Or maybe you may reduce and glue a few of these A4 to make the scale you want. Or make the sprite totally digitally, no paper concerned. Or another answer I may not have considered… To the power of the artist and the constraints of the finances.