Word Choice B1–C1 7 min read Updated 10 June 2026

Use fewer with countable nouns (fewer students, fewer mistakes) — nouns you can count one by one. Use less with uncountable nouns (less water, less time) — nouns measured as a mass or amount.

The Core Rule: Countable vs Uncountable Nouns

The distinction between fewer and less follows a single principle: fewer goes with countable nouns; less goes with uncountable nouns.

A countable noun is one you can enumerate individually — one error, two errors, three errors. A uncountable noun (also called a mass noun) refers to a substance, concept, or quantity that is not naturally divided into separate units — water, time, traffic, information.

The simplest test: try putting a number directly in front of the noun.

  • one error, two errors → countable → fewer errors
  • one traffic? No. → uncountable → less traffic

When to Use Fewer

Use fewer whenever the noun can be counted as separate, individual items. If you can attach a number to the noun in its natural form, it is countable and takes fewer.

There were fewer students in the class this term.

She made fewer mistakes on her second attempt.

The new process produces fewer errors.

We had fewer complaints than last month.

Buy a model with fewer moving parts.

Countable nouns commonly paired with fewer: people, students, mistakes, errors, words, pages, calories, items, jobs, hours, cars, trees, problems.

When to Use Less

Use less with uncountable nouns — things that come in an undivided mass or abstract quantity. You measure uncountable nouns (a litre of water, an hour of time) rather than count them.

Try to drink less coffee.

We have less time than I thought.

There is less traffic on Sundays.

The proposal generated less enthusiasm than expected.

The new software requires less memory.

Uncountable nouns commonly paired with less: water, time, money, information, traffic, energy, noise, space, work, research, progress, evidence, confidence.

Correct and Incorrect Examples

Correct Incorrect Noun type
✓ fewer students ✗ less students countable
✓ fewer mistakes ✗ less mistakes countable
✓ fewer calories ✗ less calories countable
✓ fewer words ✗ less words countable
✓ fewer complaints ✗ less complaints countable
✓ less water ✗ fewer water uncountable
✓ less time ✗ fewer time uncountable
✓ less traffic ✗ fewer traffic uncountable
✓ less noise ✗ fewer noise uncountable
✓ less confidence ✗ fewer confidence uncountable

The Supermarket Sign Mistake

One of the most debated grammar questions in British English involves supermarket checkout signs. Signs reading "10 items or less" appear in shops across the country — but they are grammatically incorrect.

Because items is a countable noun (one item, two items, ten items), the correct form is:

10 items or less — commonly seen, but incorrect

10 items or fewer — grammatically correct

Some major supermarkets, including Waitrose, have updated their signs to use fewer. The error persisted because the signs were written by designers rather than copy editors. It is a useful example to remember: whenever you see a countable noun, reach for fewer.

The “Less Than” Exception with Measurements

There is one well-established exception where less is used correctly even when a number appears: quantities treated as a single, unified amount.

When a number expresses a distance, duration, sum of money, or percentage as a single measure, use less than — not fewer than:

The office is less than five miles away.

The journey takes less than three hours.

The repair cost less than £100.

She finished in less than ten minutes.

Here, five miles, three hours, and £100 are all treated as single amounts rather than individual countable units. Compare this with individual items: "fewer than ten passengers" — because each passenger is individually countable.

A simple guide: if the number precedes a unit of measurement (miles, hours, pounds, kilograms, percent), use less than. If the number precedes individually countable items (people, books, errors), use fewer than.

Fewer and Less in Academic and Professional Writing

Getting this right matters in essays, reports, and formal correspondence. Examiners and editors notice the distinction. Here are examples typical of IELTS, academic, and business English:

Countries with fewer regulations often attract more investment.

The study found less evidence of a causal link than expected.

Employees working remotely reported less stress and fewer interruptions.

The revised policy generated fewer complaints and less controversy.

Spending less time on social media leads to fewer feelings of anxiety.

Notice how both words can appear naturally in the same sentence — less time (uncountable) alongside fewer feelings (countable). This is not only correct but demonstrates a strong command of English.

Memory Tip

The Count Test: Can you say one ___, two ___s? If yes → fewer. If no → less.
Or try this rhyme: FEWer for things you can ENUMERATE. Both few and enumerate share the idea of counting individual items.
Quick check: one calorie, two calories → fewer calories. One traffic? No → less traffic.

Related Grammar Topics

If you found this page helpful, these related topics cover similar word-choice questions:

Frequently Asked Questions

What is the basic rule for fewer vs less?
The rule is simple: use fewer with countable nouns (things you can count one by one: fewer books, fewer errors, fewer people) and less with uncountable nouns (things measured as a mass or amount: less water, less time, less traffic). Ask yourself: can I count them individually? If yes, use fewer. If no, use less.
Why do supermarket signs say “10 items or less”?
Strictly speaking, “10 items or less” is grammatically incorrect because items is a countable noun — it should be “10 items or fewer”. The sign became standard through widespread use rather than grammatical accuracy. Major style guides including the Oxford Style Manual and the BBC Style Guide note that fewer is the correct form here. Some supermarkets (including Waitrose) have updated their signs to “10 items or fewer”.
Is it “less people” or “fewer people”?
The correct form is fewer people because people is a countable noun — you can count people one by one. “Less people” is a very common error in both spoken and written English. Correct: “There were fewer people at the meeting than last time.” Incorrect: “There were less people at the meeting.”
When is “less than” correct with numbers?
Use less than (not fewer than) when a number expresses a single quantity or measurement treated as a unit: less than five miles, less than £10, less than three hours. These are treated as amounts rather than individual countable items. However, when referring to individually countable things, use fewer than: “fewer than five students passed” (individual students).
Is it “less calories” or “fewer calories”?
The grammatically correct form is fewer calories because calories are countable (you count them individually: 100 calories, 200 calories). “Less calories” is a widespread error, particularly in food labelling and advertising. Look for fewer calories on carefully edited packaging. In everyday conversation, “less calories” is widely used but remains technically incorrect.
Can “less” ever be used with countable nouns?
In careful written English, less should not be used with countable nouns. However, there is one accepted exception: quantities expressed as a single unit of measurement use less than even if the noun is technically countable — less than two miles, less than ten minutes, less than £5. These feel like amounts rather than individual items. Outside this exception, stick to fewer for countable nouns in formal writing.
Is it “less mistakes” or “fewer mistakes”?
The correct form is fewer mistakes because mistakes are countable — you can have one mistake, two mistakes, three mistakes. “Less mistakes” is a common error. Examples: “She made fewer mistakes on the second test.” “With practice, you will produce fewer mistakes in your writing.” This distinction is particularly important in academic and business writing.
How do I remember whether to use fewer or less?
Use the Count Test: ask yourself whether you can count the noun one by one. If you can say “one ___, two ___s”, use fewer. If you cannot, use less. Quick test: “one error, two errors” — yes, so: fewer errors. “One traffic, two traffics” — no, so: less traffic. Another memory trick: FEWer rhymes with counter — fewer for things you can count.
Is it “less words” or “fewer words”?
The correct form is fewer words because words are countable. “Less words” is incorrect. Examples: “Try to use fewer words in your summary.” “The second version had fewer words but was clearer.” A related contrast: fewer words (countable) but less language (uncountable) — which illustrates that the same topic area uses different words depending on the noun.
Does this rule apply equally in British and American English?
Yes, the fewer/less rule is the same in both British and American English. Major style guides on both sides of the Atlantic — the Oxford Style Manual, the Chicago Manual of Style, AP Stylebook — all recommend fewer for countable nouns and less for uncountable nouns. The widespread use of less with countable nouns (especially in informal speech) is considered an error in formal writing in both varieties of English.