For all of your essays, you must use Times New Roman 12 pt. font or the equivalent. So, if you are using something like Cambria or Calibri, you cannot use size 12 because it is significantly larger than Times New Roman size 12. You have to use a lower font size to make it equivalent. When in doubt, just use Times New Roman size 12 and you’ll know that you’re fine or try changing your essay to that font to see if the length ends up being the same.