Fewer vs. Less
The traditional distinction uses “fewer” with plural countable nouns and “less” with uncountable nouns, amounts, and degree. Modern informal speech also uses “less” with plural countable nouns, but Cambridge notes that this is traditionally not considered correct in formal standard usage.
Use “fewer” with plural countable things (“fewer cars”) and “less” with uncountable amounts (“less traffic”) as the standard formal rule. Informal speech often extends “less” to plural count nouns, so context and register matter.
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| plural countable things | fewer | Use the traditional formal choice with items you can count individually. |
| uncountable quantity or amount | less | Use “less” for mass nouns, amount, or degree. |
| informal plural-count use | less occurs | Recognize the informal pattern, but prefer “fewer” when formal standard usage is required. |
Quick tests
Meaning / construction test
Are you comparing a plural set of individually countable things?
If yes: Use “fewer” in formal standard writing.
If no: Use “less” for an uncountable amount or degree; informal speech can also extend “less” to plural count nouns.
Caveat: Cambridge notes that informal English can use “less” with plural count nouns, so the formal count/mass rule should not be presented as a claim that every other use is impossible English.
Examples
The revised form has fewer fields.
“Fields” are plural countable items.
There is less traffic after midnight.
“Traffic” is treated as an uncountable amount.
The new route is less difficult.
“Less” can compare degree as well as mass quantity.
Further guidance
Core Rule
Cambridge states the usual distinction as less with uncountable nouns and fewer with plural nouns.
Modern Informal Usage
Less is often heard with plural countable nouns in informal speech, although Cambridge labels fewer as the traditionally correct form in that construction.
Practical Examples
“Less work” and “less traffic” refer to amounts; “fewer cars” and “fewer mistakes” refer to countable plural items.
With Of
Before articles, demonstratives, possessives, or pronouns, use “less of” with singular/uncountable reference and “fewer of” with plural reference.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Less or fewer? — Cambridge Grammar (opens in a new tab)Cambridge University Press · Countability distinction and modern informal usage