hundreds of thousand (thousands of) users

Writers sometimes type "hundreds of thousand" when they mean either several thousand or many hundreds of thousands. That phrase is ungrammatical: use "thousands of" for several thousand, or "hundreds of thousands" when you mean multiples of 100,000.

Quick answer

Don't write "hundreds of thousand." Use "thousands of" for several thousand, or "hundreds of thousands" for 100,000 or more.

"There are hundreds of thousand users" → incorrect
If you mean ~1,000-99,999, write "thousands of" (or an approximate numeral: "about 3,000").
If you mean 100,000+, write "hundreds of thousands" (or an approximate numeral: "around 200,000").

Why "hundreds of thousand" is wrong (core explanation)

"Hundreds of" is a plural quantifier and needs a plural noun after "of" (hundreds of people, hundreds of books). "Thousand" alone is singular, so "hundreds of thousand" mixes plural quantifier with a singular noun.

Fix it two ways: pluralize the noun ("hundreds of thousands") or change the quantifier to match the intended scale ("thousands of").

'hundreds of' + plural noun → correct (hundreds of examples)
'hundreds of' + singular noun (thousand) → incorrect
'a hundred thousand' → means exactly 100,000

Wrong → Right: Wrong: There are hundreds of thousand users on the website.
Correct: There are thousands of users on the website.
Wrong → Right: Wrong: Hundreds of thousand people watched the stream.
Correct: Hundreds of thousands of people watched the stream.
Wrong → Right: Wrong: She saved hundreds of thousand dollars.
Correct: She saved hundreds of thousands of dollars.

Quick grammar rules you can use

"Hundreds of" and "thousands of" are plural quantifiers and take plural nouns. Use numerals for precision: 200,000, or combine with an approximation word: about 200,000.

'hundreds of' + plural noun (hundreds of voters) - correct
'thousands of' + plural noun (thousands of users) - correct
'a hundred thousand' = 100,000 (singular because of 'a')

Wrong → Right: Wrong: She saved hundreds of thousand dollars.
Correct: She saved hundreds of thousands of dollars.
Wrong → Right: Wrong: He earned thousand of dollars last year.
Correct: He earned thousands of dollars last year.

Spacing and hyphenation notes

Keep "hundreds of thousands" spaced normally. Do not hyphenate that phrase in running text.

Use hyphens when a number-plus-noun becomes a compound adjective before another noun: "a 200,000-person conference" is correct; avoid "hundreds-of-thousands-person."

Correct noun phrase: "hundreds of thousands of people" (spaces)
Hyphenated adjective: "a 250,000-member club" or "a 10,000-person marathon"
Avoid "hundreds-of-thousands" as a hyphenated chunk in prose

Wrong → Right: Wrong: We reached hundreds-of-thousand downloads last quarter.
Correct: We reached hundreds of thousands of downloads last quarter.
Usage: Correct (adjective use): We hosted a 200,000-person event.

Real usage and tone: pick the right scale

"Thousands of" feels casual and approximate; it's common in emails, posts, and general reporting. "Hundreds of thousands" signals a much larger quantity - use it only when the number genuinely exceeds 100,000.

For formal reports or academic work, prefer rounded numerals ("around 3,000", "approximately 250,000") instead of vague quantifiers.

Casual: use "thousands of" for rough statements (social posts, messages).
Work/reports: use "hundreds of thousands" only if the figure is in that range; otherwise give a rounded numeral.
School/academic: give exact or rounded numerals when data precision matters.

Work: Our Q1 analytics show thousands of active users this month.
Work: We project hundreds of thousands of dollars in annual savings from automation.
School: The dataset contains thousands of records for analysis.
School: The national survey gathered responses from hundreds of thousands of students.
Casual: I've posted that joke thousands of times online.
Casual: There must be hundreds of thousands of memes about that.

Try your own sentence

Test the whole sentence, not just the phrase. Context usually shows whether "thousands" or "hundreds of thousands" fits.

Examples you can copy (short templates and corrections)

Swap the noun after the quantifier or choose a quantifier that matches the scale. If unsure, use a rounded numeral with "about" or "around."

Replace the wrong phrase with: "thousands of", "hundreds of thousands of", "about 3,000", "around 200,000".
Adjust the noun: people, users, dollars, downloads, responses.

Wrong → Right: Wrong: I have hundreds of thousand unread emails.
Correct: I have hundreds of thousands of unread emails.
Wrong → Right: Wrong: They donated hundreds of thousand dollars to charity.
Correct: They donated hundreds of thousands of dollars to charity.
Usage (Work): Our launch attracted thousands of downloads in the first week.
Usage (School): Thousands of students completed the online assignment.
Usage (Casual): There are thousands of photos from that trip on my phone.
General: Around 200,000 people attended the festival (or: hundreds of thousands attended).

How to fix your sentence (step-by-step rewrites)

Three steps: spot "hundreds of thousand"; decide the intended scale; replace with the correct phrase or a rounded numeral.

If the figure is ~1,000-99,999 → use "thousands of" or "about X,000".
If the figure is ≥100,000 → use "hundreds of thousands" or "around X00,000".
When precision matters, use a rounded numeral with "about" or "around".

Rewrite:
Original: There are hundreds of thousand of visitors each month.
Rewrite: There are hundreds of thousands of visitors each month.
Rewrite:
Original: We expect hundreds of thousand dollars in revenue next year.
Rewrite: We expect hundreds of thousands of dollars in revenue next year.
Rewrite:
Original: There are hundreds of thousand reasons to try it.
Rewrite: There are thousands of reasons to try it.
Rewrite:
Original: We estimate hundreds of thousand users by launch.
Rewrite: We estimate around 200,000 users by launch (or: hundreds of thousands of users).

Memory tricks and quick heuristics

Use a quick mental substitution: if the number would be written as "200,000" in digits, say "hundreds of thousands"; if it would be "3,000", say "thousands of."

Visualize the number in digits - that tells you the phrase.
Ask: can I pluralize the noun after "of"? If not, change the phrase.
When rushing, prefer a rounded numeral + "about/around" for clarity.

Tip: Visualize "200,000" → use "hundreds of thousands"; visualize "3,000" → use "thousands of."

Similar mistakes to watch for

The same plurality mismatch appears in errors like "thousand of" (should be "thousands of") and "a hundreds of" (should be "a hundred" or "hundreds of"). Apply the same fixes: pluralize the noun or use numerals.

Wrong patterns: "thousand of", "a hundreds of", "hundreds of thousand".
Fix by pluralizing or using numerals: "thousands of", "a hundred", "hundreds of thousands", "about 150,000".
Watch compound adjectives: use numerals with hyphens ("200,000-person") when modifying a noun directly.

Wrong → Right: Wrong: He earned thousand of dollars last year.
Correct: He earned thousands of dollars last year.
Wrong → Right: Wrong: They counted a hundreds of votes.
Correct: They counted a hundred votes (or: hundreds of votes).
Wrong → Right: Wrong: I saw about thousands of comments.
Correct: I saw thousands of comments (or: about 3,000 comments).

FAQ

Is "hundreds of thousand" ever correct?

No. It's ungrammatical because "hundreds of" needs a plural noun after "of". Use "hundreds of thousands" or "thousands of" depending on the scale.

When should I use "thousands of" versus "hundreds of thousands"?

"Thousands of" fits several thousand (roughly 1,000-99,999). "Hundreds of thousands" fits quantities of 100,000 or more. For precision, use rounded numerals: "about 3,000" or "around 200,000".

How do I write 200,000 in natural English?

You can write the numeral "200,000", spell it out as "two hundred thousand", or say "around two hundred thousand" if approximate. "Hundreds of thousands" is less precise but acceptable if you don't want an exact figure.

Can I say "a hundred thousand" instead?

"A hundred thousand" means exactly 100,000. If you mean many multiples of 100,000, use "hundreds of thousands". If you mean roughly 100,000, "about a hundred thousand" works.

What's a fast editing checklist to catch this error?

Scan for "hundreds" or "thousand"; check the noun after "of" - if it's the singular "thousand", change it. If unsure, swap in a rounded numeral with "about" or "around".

Need a quick fix for a sentence?

Paste your sentence into a checker or read it aloud, check the digit scale, then swap in "thousands of", "hundreds of thousands", or a rounded numeral. A brief edit will make your meaning clear for work, school, or casual posts.