Less vs. Fewer
The traditional edited-English distinction uses “fewer” with plural countable nouns and “less” with uncountable nouns. Current English also uses “less” in several countable contexts, especially measurements, time, money, distances, and informal speech, so the rule is not absolute.
A safe default is “fewer errors” but “less work.” Use “less” naturally for measurements and amounts such as “less than five years” or “less than ten dollars.”
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| countable plural items | fewer | Use “fewer” as the safe default. |
| uncountable amount or mass | less | Use “less.” |
| measurement, time, money, distance, or aggregate amount | less | “Less” is natural in many measurement expressions. |
Quick tests
Meaning / construction test
Are you modifying separate countable plural items?
If yes: Use “fewer” as the default.
If no: Use “less” for mass/amount meanings and normal measurement expressions.
Caveat: Actual usage includes established measurement and idiomatic exceptions; do not reduce the distinction to a mechanical noun-counting rule.
Examples
We found fewer errors in the second draft.
“Errors” are separate countable items.
The revision required less work.
“Work” is treated as an amount.
The trip took less than five hours.
Measurements of time naturally take “less.”
Further guidance
Core Rule
Cambridge gives the traditional pattern: less with uncountable nouns, fewer with plural countable nouns.
Fast Test
Ordinary countable things → fewer is the safest edited choice. Masses, amounts, degree, money, time, distance or measurement → less is often natural.
Usage Boundary
Cambridge also notes that less with plural countables is common in informal speech and that less is natural with quantities such as time and money when treated as amounts.
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