A good rule of thumb is 14 or 16 points in common fonts like Calibri, Courier, Arial or Times New Roman.
ກົດລະບຽບທີ່ດີຂອງຫົວຂໍ້ແມ່ນ 14 ຫຼື 16 ຈຸດໃນໂປຣແກຣມທົ່ວໄປເຊັ່ນ Calibri, Courier, Arial ຫຼື Times New Roman.