all though (although)

Writers often type "allthough" or split it into "all though." Neither form is the conjunction you want for contrast. Use although (one word) for contrast; use all through or throughout for duration.

Find quick fixes, concrete wrong/right sentence pairs, rewrite patterns, and simple checks to spot and fix this error in work, school, and casual writing.

Quick answer: which form is correct?

Use although (one word) to introduce contrast or concession. Do not use allthough. If you mean "during the whole time," use all through (two words) or throughout.

Although = correct conjunction for contrast (e.g., Although it rained, we went out).
Allthough = incorrect spelling; treat it as a typo.
All through / throughout = duration (e.g., I stayed up all through the night).

Core grammar: what although does

Although is a subordinating conjunction that links a contrasting clause to a main clause (similar to despite or even though). It is always one word.

If the idea is duration rather than contrast, use all through or throughout.

Function: show contrast or concession - Although she was tired, she finished the report.
Form: one word; spelling affects how readers parse the sentence.

Wrong: Allthough she was tired, she finished the report.
Right: Although she was tired, she finished the report.

Grammar details: punctuation and clause order

If an although-clause begins the sentence, follow it with a comma. If it follows the main clause, the comma is optional and often left out.

Make sure each clause has a verb to avoid run-ons.

Although + clause first → comma: Although it rained, we left on time.
Main clause + although + clause → comma optional: We left on time although it rained.
When the clause is short, pick the rhythm that reads naturally.

Usage: Although the software was new, the team adopted it quickly.
Usage: The team adopted it quickly although the software was new.

Spacing and meaning: all through vs. although

Ask whether you mean duration or contrast. If the sense is "throughout the time," use all through or throughout. If the sense is "despite," use although.

Try replacing the phrase with despite (for contrast) or throughout (for duration) to check your meaning quickly.

Contrast? → although. Duration? → all through / throughout.
Substitute test: replace with despite or throughout to see which preserves meaning.

Wrong: All though the band played, few people danced.
Right: Although the band played, few people danced.
Usage: I listened to the band all through the night.
Usage: I listened to the band throughout the night.

Hyphenation: is "all-through" ever correct?

You almost never hyphenate all-through. Hyphens are used for compound modifiers before nouns (e.g., well-known study). all through is a phrase meaning duration; prefer throughout or reword if you need an adjective.

If you need a compound adjective meaning "lasting the whole night," write all-night, not all-through-night.

Avoid: an all-through-night meeting.
Use: an all-night meeting or a meeting that lasted all night.
Use hyphens for established compounds (all-time high), not for arbitrary joins like all-through.

Wrong: We had an all-through-night meeting.
Right: We had an all-night meeting / We had a meeting that lasted all night.

Real usage: work, school, and casual examples

Although works across registers. Use it in formal reports and essays for clear contrast; use all through for continuous duration in narratives and notes.

Work: use although or despite for contrast; use all through for long stretches of work.
School: although is the safe choice in essays and lab reports when noting unexpected results.
Casual: all through is fine for storytelling; although still marks contrast.

Work:
Wrong: Allthough the deadline is tight, we can still deliver. →
Right: Although the deadline is tight, we can still deliver a draft by Friday.
Work:
Wrong: The client sign-off failed allthough we completed the tasks. →
Right: Although we completed the tasks, client sign-off failed.
Work: Correct duration: We worked all through the quarter to meet targets.
School:
Wrong: Allthough the sample was contaminated, we learned something. →
Right: Although the sample was contaminated, the test still produced useful data.
School: Correct duration: She studied all through the semester and improved her grade.
School:
Right: Although the hypothesis was disproved, the experiment suggested a new direction.
Casual:
Wrong: Allthough I was tired, I went to the concert. →
Right: Although I was tired, I went to the concert.
Casual: Correct duration: I was awake all through the movies.
Casual:
Right: Although it rained, we had a great time at the picnic.

Try your own sentence

Test the whole sentence, not just the phrase. Context usually makes the correct choice obvious.

Examples: focused wrong/right pairs (six common mistakes)

Read the corrected sentence aloud to hear the correct rhythm. Each wrong example shows allthough or the split all though; each right example shows the fix.

Wrong: Allthough I disagree, I respect your opinion.
Right: Although I disagree, I respect your opinion.
Wrong: I stayed up allthough the noise outside wouldn't let me focus.
Right: Although there was noise outside, I stayed up to finish my report.
Wrong: All though the team trained hard, they lost the game.
Right: Although the team trained hard, they lost the game.
Wrong: We failed allthough the plan was sound.
Right: We failed although the plan was sound.
Wrong: All though everyone agreed, the plan changed.
Right: Although everyone agreed, the plan changed.
Wrong: Allthough we rehearsed, the presentation faltered.
Right: Although we rehearsed, the presentation faltered.

Rewrite help: quick fixes and ready rewrites

Decide: contrast → although; duration → all through/throughout. If you're unsure, rewrite to remove the ambiguous phrase (use despite, throughout, or split the sentence).

Move the clause if the sentence rhythm feels off.
Swap in despite or throughout as a test, or split long clauses into two sentences.

Rewrite:
Original: Allthough tired, I couldn't sleep. → Although I was tired, I couldn't sleep. →
Alternative: I was tired, but I couldn't sleep.
Rewrite:
Original: Allthough everyone agreed, the plan changed. → Although everyone agreed, the plan changed. →
Alternative: Everyone agreed. The plan still changed.
Rewrite:
Original: I worked allthough the storm lasted. → I worked all through the storm. → Or: Although the storm lasted, I kept working.
Rewrite:
Original: Allthough the device was cheap, it failed. → Although the device was cheap, it failed. →
Alternative: The device was cheap; however, it failed.
Rewrite:
Original: We read allthough the lights were out. → Although the lights were out, we read by flashlight. →
Alternative: The lights were out. We still read by flashlight.

Memory tricks and quick checks

Two fast checks help: meaning test and word-count test. Meaning test: does the phrase mean "despite"? If yes, use although. If it means "throughout," use all through or throughout. Word-count test: contrast conjunctions are usually one word (although, because, since).

Mnemonic: "One-bridge for contrast" - although is a single bridge joining opposing ideas.
Sound test: read the sentence without the phrase. If you hear a contrast connector (but, yet, despite), use although.
Visual test: if you see two words (all though), check whether duration makes sense; otherwise join them into although.

Usage: Although she practiced, she still felt nervous. (contrast → one word)
Usage: I read all through the night. (duration → two words)

Similar mistakes to watch for

Writers also mix up although with albeit, altogether, and all together. Each word has a distinct meaning and use.

albeit = although (often clause-internal): The plan, albeit risky, worked.
altogether = entirely/completely: That's altogether different.
all together = in a group: We were all together in the lobby.
throughout = during the whole time (often cleaner than all through).

Usage: Albeit expensive, the tool saved time.
Usage: The costs were high, and the results were altogether disappointing.
Usage: We arrived all together at the conference.

FAQ

Is "allthough" correct?

No. "Allthough" is a misspelling. Use although (one word) for contrast.

Should I write "all though" or "all through"?

Write all through (two words) or throughout for duration. Write although (one word) for contrast.

How can I quickly fix every allthough mistake in my document?

Search for allthough and the two-word sequence "all though." For each instance ask: does it mean 'despite'? If yes, replace with although. If it means 'throughout/during,' replace with all through or throughout.

Does spellcheck automatically correct allthough to although?

Many spellcheckers flag allthough and suggest although, but they may not catch whether the context requires duration or contrast. Read each suggestion to confirm meaning.

Can I use albeit instead of although?

Albeit is a valid substitute in many formal contexts, but it's clause-internal and can sound old-fashioned in casual writing. Use it only if the tone fits.

Still unsure about a sentence?

Paste a sentence into a quick grammar checker or compare it to the wrong/right pairs above. Fixing one mistaken conjunction usually clears the whole sentence.

Bookmark these examples so you can scan for the pattern the next time you edit.