car pool (carpool)

Short answer: write carpool as one word. Use carpool for the noun, verb, and adjective (for example, carpool lane).

Below: why carpool is one word, quick fixes, many ready-to-use rewrites, and memory tricks to stop the error for good.

Quick answer

Use carpool as a single word in modern English. Avoid "car pool" and "car-pool" unless a house style or layout forces a different form.

Correct: carpool (noun: We joined a carpool; verb: We carpool on Fridays; adjective: the carpool lane).
Avoid: car pool, car-pool - these are nonstandard in most dictionaries and style guides.
If unsure, follow your dictionary or house style; general web and editorial practice favors carpool.

Core explanation: why "carpool" is one word

"Carpool" names a recurring, established activity: sharing rides among people with similar routes. Frequent verb-noun combinations often fuse into single words (compare daycare, bookstore).

Dictionaries and mainstream style guides list carpool as the standard single-word form; using that form matches modern usage and search behavior.

If a phrase names a stable activity or system and people use it often, it tends to become one word.
When in doubt, prefer the dictionary form: carpool.

Spacing: how to spot and fix "car pool" quickly

Search for "car pool" and "car-pool" and replace them with "carpool" unless a style rule overrides that choice. Then confirm derived forms (carpooling, carpooled, carpooler) are correct.

Checklist: Find → Replace with "carpool" → Check adjacent words and verb tense → Re-read for clarity.
Use find-and-replace across a document or add "car pool" → "carpool" to your autocorrect to catch future errors.
After bulk fixes, scan for "carpooling" and "carpooler" to ensure forms remain correct.

Hyphenation and style guides: when (rarely) to use a hyphen

Most references list "carpool" as one word. Hyphenation ("car-pool") is outdated and normally only used for forced line breaks or historical texts.

If your publication or brand has a house style, follow it. For everyday writing and web content, use the single-word form.

Hyphenate only for typographic needs (very narrow columns) or when a specific style manual demands it.
Modern examples: "The carpool schedule is posted." Not: "The car-pool schedule is posted."

Grammar: noun, verb, adjective and common forms

Carpool functions as a noun (a carpool), a verb (to carpool), and an adjective (carpool lane). Use carpooling, carpooled, carpooler for other forms.

Noun: Join the carpool. Verb: We carpool every Tuesday. Adjective: the carpool lane.
Keep the root fused when adding endings: carpool → carpooling; carpooler (no space).

Wrong: They will car pool tomorrow.
Right: They will carpool tomorrow.
Wrong: We are car pooling this week.
Right: We are carpooling this week.
Right: Use the carpool lane between 7-9 AM.

Real usage and tone: work, school, and casual examples

Copy the "Right" sentences to replace incorrect versions in emails, notices, or messages.

Work 1 - Wrong: Please add your name to the car pool list on the intranet. Right: Please add your name to the carpool list on the intranet.
Work 2 - Wrong: HR is tracking the car-pool program costs. Right: HR is tracking the carpool program costs.
Work 3 - Wrong: Office car pool pick-up is at 7:30. Right: Office carpool pick-up is at 7:30.
School 1 - Wrong: The school car pool will run on Fridays. Right: The school carpool will run on Fridays.
School 2 - Wrong: Add your number to the PTA car-pool sheet. Right: Add your number to the PTA carpool sheet.
School 3 - Wrong: Do you need a car pool to the away game? Right: Do you need a carpool to the away game?
Casual 1 - Wrong: Anyone up for a car pool to the concert? Right: Anyone up for a carpool to the concert?
Casual 2 - Wrong: I put us in a car-pool for the trip. Right: I put us in a carpool for the trip.
Casual 3 - Wrong: Want to car pool there together? Right: Want to carpool there together?

Try your own sentence

Paste your full sentence into the checker below to see the correct form in context; context usually makes the right answer clear.

Examples: common wrong/right pairs grouped and extended

These pairs illustrate spacing, hyphenation, tense, and adjective uses so you can spot patterns at a glance.

Pair 1 - Wrong: We use a car pool app to coordinate rides. Right: We use a carpool app to coordinate rides.
Pair 2 - Wrong: She signed the car-pool sheet outside the classroom. Right: She signed the carpool sheet outside the classroom.
Pair 3 - Wrong: Is there a car pool from the north side? Right: Is there a carpool from the north side?
Pair 4 - Wrong: They car pooled last summer. Right: They carpooled last summer.
Pair 5 - Wrong: Car pool lanes are congested. Right: Carpool lanes are congested.
Pair 6 - Wrong: We started an office car-pool to save parking fees. Right: We started an office carpool to save parking fees.
Pair 7 - Wrong: Who will car pool with me on Monday? Right: Who will carpool with me on Monday?
Pair 8 - Wrong: Car-pool coordinator needed. Right: Carpool coordinator needed.
Pair 9 - Wrong: Kids' car pool schedule updated. Right: Kids' carpool schedule updated.
Pair 10 - Wrong: Car pooling saves money and reduces emissions. Right: Carpooling saves money and reduces emissions.

Rewrite help: ready-to-use rewrites for work, school, and casual contexts

Three short patterns-announcement, RSVP/email sentence, SMS invite-followed by context variants. Drop these into templates or messages.

Work - Announcement: Original: Office car pool sign-up.
Rewrite: Office carpool sign-up.
Work - Email: Original: Join the car pool to reduce costs.
Rewrite: Join the carpool to reduce costs.
Work - RSVP: Original: Please RSVP if you want to join the car pool.
Rewrite: Please RSVP if you want to join the carpool.
School - Announcement: Original: PTA car pool volunteers needed.
Rewrite: PTA carpool volunteers needed.
School - Note: Original: Will there be a car pool for the field trip?
Rewrite: Will there be a carpool for the field trip?
Casual - Text: Original: Anyone want to car pool to the festival?
Rewrite: Anyone want to carpool to the festival?
Casual - Invite: Original: Let's make a car pool for the game.
Rewrite: Let's make a carpool for the game.

Memory tricks and quick checks

Short habits beat long rules. Use these quick mnemonics and automations.

Mnemonic: "carpool lane" - you would never write "car pool lane," so fuse the first two words.
Automation: Add a replace rule from "car pool" and "car-pool" to "carpool" in your editor or phone.
Quick check: If it names shared rides (noun, verb, or adjective), use one word.

Habit: Before sending, press Ctrl+F for "car pool" and replace matches with "carpool."

Similar mistakes and confusable terms

Pick the term that matches your meaning; similar words are often used incorrectly in place of carpool.

Car park (British) = parking area. American equivalent: parking lot.
Carport = a covered shelter for a car (one word).
Rideshare = app-based, on-demand paid trips; different from planned carpooling among acquaintances.

Example: British: We left the car in the car park near the stadium. (Do not confuse with carpool.)
Example: Home: He built a carport beside the garage.
Example: App: She used a rideshare app to get home (not the same as carpooling with coworkers).

FAQ

Is "carpool" one word or two?

Carpool is one word in modern English. Most dictionaries and style guides prefer the single-word form.

Should I ever hyphenate it as "car-pool"?

No for standard text. Hyphenation is outdated and only needed for typographic or forced layout reasons.

Can I use "carpool" as a verb?

Yes. Say "We carpool to work." Use carpooling, carpooled, carpooler for other forms.

What's the fastest way to fix every instance in a long document?

Run a project-wide find-and-replace for "car pool" and "car-pool" to "carpool," then scan for derived forms like "carpooling" to confirm usage.

Is "rideshare" the same as "carpool"?

Not exactly. Rideshare usually refers to paid app-based trips; carpool describes planned shared rides among friends, neighbors, or coworkers.

Quick check before you send

Find "car pool" and "car-pool" in your draft and replace them with "carpool." Add the replacement to autocorrect to prevent repeat errors.

If you use a grammar checker or editor with custom rules, add "car pool" → "carpool" so spacing mistakes are flagged automatically.