Fewer vs less: use fewer for things you count and less for amounts

The rule: fewer for number, less for amount

Cambridge Dictionary explains that we use the quantifiers less and fewer to talk about quantities, amounts and degree. QuillBot states the general rule clearly: use "fewer" with plural, countable nouns (for example, "fewer water bottles") and "less" with uncountable nouns (for example, "less water").

Amerilingua gives a way to think about it: fewer is used when talking about a smaller number of something, while less is used when talking about a smaller amount of something. For things that can be counted, use fewer. For things that cannot be counted, use less.

A Cambridge example uses both: better cycle routes would mean fewer cars and fewer accidents. Cars and accidents are things you can count.

The test: can you count it?

Put a number in front of the noun and see whether it sounds natural.

• cars: two cars, three cars. You can count them, so fewer cars.
• traffic: two traffic? No. You cannot count it, so less traffic.
• bottles: five bottles. Fewer bottles.
• water: five water? Not in this sense. Less water.
• mistakes: four mistakes. Fewer mistakes.
• patience: four patience? No. Less patience.

Singular countable nouns are not used with either word in this way. You say one car, not fewer car. If a noun is singular and countable, use another structure, such as a smaller car or not as much of a car.

Some nouns can be both countable and uncountable, with a change of meaning. Hair is uncountable (less hair), but a single hair is countable (fewer hairs on the brush). Coffee is uncountable (less coffee), but a cup of coffee is countable (fewer coffees, meaning cups). Think about whether you mean the substance or the items.

Fewer than and less than

The same rule applies with than. QuillBot's common guideline is to use "less than" when modifying uncountable nouns (for example, "less than a gallon left") and "fewer than" when modifying countable nouns (for example, "fewer than three people").

This answers the question what does "fewer than 4" mean? It means 3, 2, 1 or 0. The number 4 is not included.

More examples:

• Fewer than ten students passed the test.
• There is less than a litre of milk left.
• I sleep fewer hours than I need.
• We have less money than we hoped.

Percentages follow the same rule. QuillBot's example: we learned that 10% fewer students preferred online classes this year. Students are countable, so it is fewer. For a percentage of an uncountable noun, use less: 10% less rainfall.

Another point from Cambridge: when we use fewer or less before articles (a, an, the), demonstratives (this, that), possessives (my, your) or pronouns (him, them), we need to use of. So you say fewer of the students and less of the cake, not fewer the students. Cambridge adds that we use less of with singular nouns and fewer of with plural nouns.

Exceptions that are fine: time, money, distance

Some measurements are counted in numbers but treated as one amount. In these cases, less is normal, even in careful writing.

• Time: I have less than five minutes. (the period of time is seen as one amount)
• Money: It costs less than ten pounds.
• Distance: The station is less than two miles away.
• Weight and size: This bag weighs less than five kilos.

Merriam-Webster's usage guide says that less used of things that are countable is standard in many contexts, and in fact is more likely than fewer in a few common constructions, especially ones involving distances (as in "less than three miles"), sums of money, units of time and weight. The reason is that you are talking about the whole amount of time, money or distance, not about separate items. You would say fewer than five coins (separate things) but less than five pounds (an amount of money).

Be careful with the idea of "exceptions". Many style guides allow this use, but if you are writing for an exam or a formal report, you can often avoid any doubt by rewording: Fewer than five coins or an amount below five pounds.

The British Council's reference shows how informal use differs from the traditional rule: "We have less time than you" but "We have fewer friends than you", yet in everyday speech and writing people use less with countable nouns too, as in the supermarket sign "10 items or less". Merriam-Webster adds that less with ordinary plural count nouns ("made less mistakes") is pretty rare in writing and is usually better avoided.

The famous supermarket sign "10 items or less" is a case where careful writers prefer "10 items or fewer", because items are countable. In everyday speech, you will hear less often. Cambridge notes that you will often hear less used with plural countable nouns in informal spoken situations, but traditionally it is not considered to be correct.

Fewer and less in speech and writing

In casual speech, native speakers often use less with plural nouns: There are less people today. Because it is so common, you will hear it everywhere, and nobody will misunderstand you. But in writing, in exams and in formal speech such as a presentation or an interview, use fewer with countable nouns. It sounds more careful, and some readers will notice the error.

A practical plan:

• In an exam or formal writing: follow the rule.
• In formal speaking, such as an interview: follow the rule, because you are being judged on accuracy.
• In relaxed conversation: do not worry. You will hear less both ways.

Pronunciation is simple. Fewer has two syllables: FEW-er (like few plus er). Less has one: LESS. The two words do not sound alike, so mixing them up is a grammar problem, not a hearing problem. A short practice: say "fewer cars, less traffic" five times, stressing the first word each time.

If you want to see how this kind of small accuracy matters in speaking tests, see our IELTS speaking topics and practise with a timer.

Common mistakes

• Wrong: There are less people in the office today.
• Right: There are fewer people in the office today.
• Wrong: I have fewer time than before.
• Right: I have less time than before.
• Wrong: Fewer of the cake was left.
• Right: Less of the cake was left.
• Wrong: Fewer than 4 means 4 or fewer.
• Right: Fewer than 4 means 3 or fewer.

Other mistakes to avoid:

• "Less" with a plural noun after "of": Less of the students came. Use fewer of the students.
• "Few" and "little" confusion: few goes with countable nouns (few books), little goes with uncountable nouns (little time). These are the small-quantity partners of fewer and less.
• Using "more less" or "most less": not standard. Use less alone, or fewer.

A final habit: when you see less, ask whether the noun is countable. When you see fewer, ask whether the noun is plural. Two seconds of checking catches almost every error.

If you are working on grammar through speaking, our guide on how to speak English fluently shows how to make small corrections part of a daily routine.

Practice: fewer or less?

Choose the correct word. The answers follow.

1. We need ___ meetings.
2. I drink ___ coffee now.
3. There are ___ chairs than people.
4. She has ___ patience than her brother.
5. ___ than twenty people applied.
6. I would like ___ sugar, please.
7. This road has ___ accidents than the old one.
8. We have ___ time than we thought.

Answers: 1. fewer. 2. less. 3. fewer. 4. less. 5. Fewer. 6. less. 7. fewer. 8. less.

Now write three sentences about your own life with fewer and three with less, and say them aloud. For example: "I have fewer meetings this month, and I have less time for hobbies." Speaking examples from your real life makes the rule stick better than a list of rules does. A conversation partner, including an AI tutor, can listen for these small grammar choices while you talk.