Short answer
In US English, ‘fewer’ generally refers to a smaller number of countable things, while ‘less’ is used for mass quantities or amounts. However, ‘less’ is widely accepted with measures of time, money, distance, and in certain set phrases, even when the items are countable. 1 2 3
Both words are comparatives indicating a reduction, but ‘fewer’ typically modifies count nouns, while ‘less’ is used for mass nouns and some countable measures by convention.
On this page
At a glance
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| Question | fewer | less |
|---|---|---|
| Used with count nouns? | Yes, typically | Rarely, with exceptions |
| Used with mass nouns? | No | Yes, standard |
The table summarizes the stated definitions and scope. 1 2 3
What each thing is
Fewer. Fewer is a comparative adjective or pronoun used to indicate a smaller number of countable items, such as people or objects, in contrast to a larger quantity. It typically applies to things that can be individually counted. 2
Less. Less is a comparative adjective, adverb, noun, or preposition used to refer to a smaller amount or quantity, especially with mass nouns or things measured rather than counted. It also appears in set phrases and exceptions. 3
Key differences
The main distinction is whether the noun refers to countable items (‘fewer’) or an uncountable amount or mass (‘less’), though conventions allow ‘less’ with certain countable measures. 1 2 3
How to tell them apart
A practical test is to ask if you can count the items individually. If so, ‘fewer’ usually fits. However, this test has limits, as ‘less’ is common with time, money, and measurements, regardless of countability. 1
Where they overlap
While ‘fewer’ and ‘less’ sound similar and both indicate a decrease, their usage overlaps in phrases like ‘250 words or less’ and ‘less than 10 miles,’ where ‘less’ is standard even with countable things. 1 3
Edge cases
A notable exception is signage like ‘10 items or less’ at supermarkets, where ‘less’ is widely used and accepted, though some prefer ‘fewer.’ Measures of time, money, and distance also favor ‘less’ regardless of countability. 1 2
Why the distinction exists
The difference reflects linguistic roles: ‘fewer’ derives from ‘few’ and is tied to number, while ‘less’ comes from ‘little’ and relates to amount. Usage has shifted over centuries, with conventions shaping current patterns. 1 2 3
Common misconceptions
A common misconception is that ‘less’ can never be used with countable nouns. In reality, ‘less’ is standard in many contexts involving numbers, measures, and set phrases, despite the traditional rule. 1
Examples
She has fewer books than her brother, but less time to read them. Here, ‘fewer’ applies to countable books, while ‘less’ refers to the uncountable concept of time. 2 3
Sources
Sources checked October 3, 2026.
- Merriam-Webster — Fewer vs. Less: Correct Usage Guide. Usage guide: definitions, examples and exceptions.
- Merriam-Webster — Fewer Definition & Meaning. Dictionary entry: definitions, usage examples and word history.
- Merriam-Webster — Less Definition & Meaning. Dictionary entry: definitions, usage examples and word history.