The widely accepted rule is to use farther when being literal and discussing a physical distance, as in “He went farther down the road.” Further is used when discussing a more symbolic distance or to discuss a degree or extent, as in “I wanted to discuss it further, but we didn’t have time.”

While “farther” is used for measurable physical distances, “further” is used when referring to a figurative distance, a metaphorical advancement, or an extension of time or degree. For example, Nothing could be further from the truth. In order to further myself, I need to receive more schooling.

“farther” is literally “further” when it comes to physical distance; “further” means the same but in a figurative sense, when we talk about the continuation of some action / time. Examples of the use of “farther”: The village is five miles farther. - There are five more miles to the village.

Farther and further can both be used as adjectives to mean “at a greater distance,” though farther is more common in US English. Example: Farther and further as adjectives When it is summer in the Northern Hemisphere, the earth is farther from the sun than during winter. Paul’s house is further from the town than Eoghan’s.