Choosing a printable grid for your task
Use a coarse grid for a worksheet with room to draw in each cell. Use more rows and columns for a denser planning sheet. Keep labels off for clean paper, or turn them on when students or collaborators need to refer to the same cell.
The printing guide calculates spacing from the selected paper size. Printer margins and fit-to-page settings can change the final spacing, so measure a test print before using the grid as a physical scale.