“There are less people in the room.”
People are countable — one, two, three. ‘Less’ is for amounts you can’t count.
For things you measure versus things you count.
“There are less people in the room.”
People are countable — one, two, three. ‘Less’ is for amounts you can’t count.
“There are fewer people in the room.”
‘Fewer’ agrees with countable nouns. Supermarkets get this wrong; you don’t have to.
Less than ten employees showed up.
Fewer than ten employees showed up.
Employees are counted one by one — ‘fewer.’
Fewer time was spent on the review.
Less time was spent on the review.
Time is a continuous amount here, not discrete units — ‘less.’
If you can put a number in front of it, use FEWER. If you can’t, use LESS. Fewer chairs, less furniture.
Long-standing rule in edited writing. In casual speech, ‘less’ with countables (‘less people’) is common but still noticed.
Plural units of measure (‘less than 5 miles,’ ‘less than $20,’ ‘less than two hours’) keep ‘less’ — because they refer to a single quantity, not individual items.
You count people, not water. Fewer people, less water.
Real-world-style usage — how this looks in a sentence people would actually write.
Which is right?