Tell it apart
| Aspect | Farther | Further |
|---|---|---|
| Physical distance | Yes | Yes |
| 'More, additional' | No | Yes: 'further details' |
| Degree or extent | Less usual | Preferred: 'take it further' |
| More common for distance in | North American English | British English |
For physical distance, either word is correct: 'a few miles farther' and 'a few miles further' mean the same thing. Further is more common in British English, farther is more common in North American English for distance. Only further works for 'more' or 'additional' ('further questions', 'until further notice'), and further is usually preferred for degree ('let's think about this further').
What it really means
Farther and further are both comparative forms of far, which is exactly why people worry about them. Two words for one idea feels like a trap. The good news is that most of the time there isn't one.
When you're talking about physical distance, the two are interchangeable. "Is it much farther?" and "Is it much further?" are both correct, and Cambridge's grammar guide is clear that there's no difference in meaning. The choice is mostly a matter of where you live: in British English, further is the more common form; in North American English, farther is more usual for distance.
The split comes when the meaning moves away from miles. Further can mean more or additional: further details, a further two minutes, closed until further notice. Farther can't do that job. Further is also the usual word for degree or extent, for going deeper rather than further down the road: "Let's take this idea further", "Nothing could be further from the truth."
So a safe policy is simple. Use further for anything that isn't a literal distance, and use either word, by habit or region, for anything that is.
Memory trick. Farther has far inside it, so keep it for real distance you could measure on a map. Everything else, from further notice to further thought, goes to further.
In real life
- Right: The station is farther than it looks. (distance, either word works)
- Right: For further information, call the number below. (additional, only further)
- Wrong: The museum is closed until farther notice. (this means 'additional notice', so it's 'further')
Questions
Q01What is the difference between farther and further?
Both can describe physical distance: 'we walked farther/further than planned'. Only further means 'more' or 'additional' ('further questions'), and further is the usual choice for degree ('I won't discuss it further').
Q02Which is British and which is American?
Oxford Learner's Dictionaries says further and furthest are the more common forms in British English, and farther and farthest are more common in North American English, when talking about distance.
Q03Is it 'further information' or 'farther information'?
Further information. In the sense of 'additional', only further is used.
Sources
- Farther, farthest or further, furthest? — Cambridge Dictionary, English Grammar Today.
- farther (adverb), with the farther / further note — Oxford Learner's Dictionaries.
- further (adjective) — Oxford Learner's Dictionaries.