“fewer” vs. “less”
Use "fewer" for countable nouns and "less" for uncountable nouns — with a widely recognized exception for measurements of time, money, and distance, which conventionally take "less" even though technically countable.
fewer
"Fewer" modifies countable nouns — things you can count individually ("fewer cars," "fewer mistakes," "fewer people"). "Fewer" comes from Old English "feawe" (few), and its comparative form has always applied specifically to countable pluralities, matching the same countable/uncountable split seen in "many" versus "much."
less
"Less" modifies uncountable nouns — things measured as a mass or amount rather than counted individually ("less water," "less time," "less patience"). "Less" comes from Old English "læssa," originally a comparative meaning "smaller," and its core sense of reduced quantity or degree has stayed remarkably stable across the entire history of the word, applying naturally to uncountable amounts.
The real distinction
The same countable/uncountable split that separates many/much and number/amount governs this pair too: "fewer" for things you could count one by one, "less" for things measured as an undivided quantity. The most famous flashpoint for this rule is supermarket express-lane signs ("10 items or less"), which grammar purists have long argued should read "10 items or fewer" since "items" is countable — a genuinely long-running, widely publicized usage debate that has made this particular pair one of the most publicly argued grammar rules in English, well beyond typical grammar-nerd circles. Major dictionaries and usage panels have gradually softened on strict enforcement, noting that "less" with countable nouns has been documented in respected English writing for centuries and is increasingly accepted in casual and even some formal contexts, particularly with numbers and measurements of distance, money, or time ("less than five miles," "less than twenty dollars") — cases where the quantity, though technically countable, is being thought of as a single measured amount rather than as individual countable units. This exception explains why "less than a hundred dollars" sounds natural to nearly every English speaker despite "dollars" being grammatically countable: money amounts, distances, and time spans are conventionally treated as single measured quantities rather than as collections of discrete countable units, a genuine, long-recognized exception to the general rule rather than an error. Style guides that still enforce the strict version of this rule tend to reserve that strictness for formal writing, while acknowledging that the express-lane "or less" usage is now so entrenched in everyday English that insisting on "fewer" there can come across as needlessly pedantic to most readers.
Examples with “fewer”
- There were fewer complaints this quarter than last.
- We received fewer applications than expected.
- Fewer students signed up for the elective this year.
- The new process resulted in fewer errors overall.
- There are fewer options available after the store closed early.
- Fewer cars were on the road during the holiday.
- The team made fewer mistakes in the second half.
- Fewer people attended the event due to the weather.
Examples with “less”
- We have less time than we thought before the deadline.
- She spends less money on takeout these days.
- There's less traffic on this route in the mornings.
- He showed less enthusiasm than usual during the meeting.
- The recipe needs less sugar than the original version.
- We're using less water since installing the new fixtures.
- There was less rainfall this year than average.
- The company reported less revenue than analysts expected.
Memory trick
Count on your fingers again: if you could tally the noun one by one (one complaint, two complaints, three complaints), reach for "fewer"; if the noun spreads out as an unbroken mass with no natural units (time, money as a general concept, water), reach for "less." One more useful check specific to this pair: for measurements of distance, time, or money treated as a single amount rather than individual units, "less" is broadly accepted even though the noun is technically countable — so don't over-correct to "fewer" in phrases like "less than a mile" or "less than an hour." One further quick check when time is short: read the express-lane test sentence itself ("ten items or less/fewer") back in your head — noticing the countable plural "items" is often the fastest way to remember which rule is even at stake in the sentence you're currently writing.