Download and print these PDFs of graph paper/grid paper. Grid spacing is 2 lines per inch (0.5 inch squares).
Currently available on letter, A4, and A3 paper size. Minimal border (margin) is 0.25 inch. Grid line weight is 0.5 points. Print in grey color.
Don’t forget to TURN OFF the option “shrink to fit” in print setting, because it may resize the grid to fit your printer’s printable area.