Fewer vs Less: The Rule, the Exceptions, and Email Fixes

"We had less complaints this month" or "We had fewer complaints this month"? Many English learners are taught a strict rule for these two words, then notice native speakers breaking it all the time, including on supermarket signs. Both dictionaries below agree on a simple rule, and both explain where it bends. Here is how to use it in work writing without second-guessing every sentence.

1. The basic rule

Cambridge Dictionary explains that less is the comparative of little and fewer is the comparative of few. It states that we usually use less with uncountable nouns and fewer with plural nouns.

Merriam-Webster phrases the same rule in terms of counting and measuring: fewer is used when a number of things can be counted ("fewer problems"), and less is used when an amount is measured ("less trouble" or "less time").

A quick test: if you can put a number in front of the noun (three meetings, ten errors), use fewer. If the noun names an amount you would measure rather than count, like time or effort, use less.

2. Before and after in work emails

Before: We had less complaints this month. After: We had fewer complaints this month. Why: complaints can be counted.

Before: The new tool means fewer manual work. After: The new tool means less manual work. Why: work is uncountable here.

Before: Less people attended the webinar than expected. After: Fewer people attended the webinar than expected. Why: people are counted.

Before: This process takes fewer effort. After: This process takes less effort.

Cambridge notes that less with plural countable nouns is often heard in informal speech but is traditionally not considered correct. Merriam-Webster adds that using less with ordinary plural count nouns, as in "made less mistakes," is pretty rare in writing and usually better avoided. In a business email, that means following the basic rule.

3. The accepted exceptions

Merriam-Webster explains that the strict rule is not accurate for all usage. Less has been used with countable things for well over a thousand years. The rule became widespread after the critic Robert Baker stated it as a personal preference, which was later turned into an absolute rule.

According to Merriam-Webster, less is standard, and often more likely than fewer, with:

• Distances: less than three miles
• Sums of money: less than twenty dollars
• Units of time and weight: less than five years, less than ten ounces
• Statistical numbers: less than 50,000 people

The reasoning is that these are usually thought of as amounts rather than as separate items. You do not picture twenty individual dollars; you picture a price.

Merriam-Webster also says less is preferred in phrases like "an essay of 250 words or less," is common after a number ("three less than the others"), and is the typical choice after "one," as in "one less worry."

So these are all fine in a work email:

• "The project should take less than six weeks."
• "The upgrade costs less than $500."
• "Please keep your summary to 200 words or less."
• "That is one less thing to worry about."

4. A tricky pair: amounts with "of"

Cambridge adds a structure that trips up learners. Before a/an, the, words like this and that, possessives like your, or pronouns like them, you need of. Use less of with singular nouns and fewer of with plural nouns:

• "As the project went on, it became less of a priority."
• "Fewer of the new hires chose the remote option."

You can also drop the noun when it is obvious. Cambridge's example uses "Fewer are killed at work" to mean fewer people. In email: "We expected 40 sign-ups, but fewer came in."

5. Advice for non-native writers

Merriam-Webster gives direct guidance: if you are not a native speaker, the simple rule is a good place to start, but be sure to consider the exceptions. That is a practical approach for business writing:

1. Use fewer with things you count, and less with amounts.
2. Switch to less for time, money, distance, weight, and phrases like "or less" and "one less."
3. When unsure, rewrite: "We received 12 complaints, down from 20" avoids the choice and gives the reader more information.

6. Key takeaways

• Use fewer with plural countable nouns (fewer errors) and less with uncountable nouns (less time).
• Using less with ordinary plural nouns is common in speech but usually better avoided in writing.
• Less is standard with distances, money, time, weight, and large statistical numbers, which are treated as amounts.
• Phrases like "250 words or less" and "one less worry" use less by standard practice.
• Use less of before singular nouns and fewer of before plural nouns when followed by "the," "this," or a possessive.