Grammarama

Farther vs. Further

Farther and farthest are used to refer to a greater physical distance. Further and furthest refer to a greater degree or other non-distance quantity. It’s more noticeable when farther is used incorrectly, but further should not be used exclusively.


Examples:

How much farther do we have to travel?
What further evidence do you need?
Neptune is always the planet farthest from the Sun now that Pluto has been demoted.
That’s the furthest thing from my mind.