🔗 Coordinated clause analyzer
Compound sentence counter
Paste prose, essays, book copy, or classroom drafts to count coordinated independent clauses, classify FANBOYS, semicolon, and conjunctive-adverb patterns, and filter common false positives.
Load realistic passages with balanced compounds, comma lists, semicolon joins, conjunctive adverbs, dialogue, and deliberately weak coordination.
DISCLOSURE: This post may contain affiliate links, meaning when you click the links and make a purchase, I receive a commission. As an Amazon Associate I earn from qualifying purchases.
Review candidate rows before editing. The counter favors independent clauses, not every sentence with a comma or conjunction.
| # | Signal | Connector | Confidence | Clause words | Risk note | Sentence preview |
|---|---|---|---|---|---|---|
| Choose a preset or paste text to see compound candidates. | ||||||
| Pattern | Typical cue | Compound strength | False-positive control |
|---|---|---|---|
| Comma + FANBOYS | , and / , but / , so | High when both sides have verbs | Reject serial lists and short second phrases |
| Semicolon join | Clause; clause | High in formal prose | Require words and verbs on both sides |
| Conjunctive adverb | ; however, / ; therefore, | Very high when after a semicolon | Check adverb is not just sentence opener |
| Bare coordinator | and / but without comma | Low to moderate | Only include in weak-link mode |
| Target text | Compound ratio | Usually means | Revision check |
|---|---|---|---|
| Middle grade | 5-20% | Quick, clear movement | Break crowded clauses first |
| Fiction prose | 10-30% | Flexible rhythm | Vary with simple and complex lines |
| Academic prose | 20-45% | Argument links are visible | Watch overextended chains |
| Rhetorical prose | 25-55% | Parallel movement | Confirm repetition is intentional |
| False positive | Looks like | Why it fails | Control used |
|---|---|---|---|
| Serial list | books, notes, and maps | No second independent clause | Verb and clause-length test |
| Compound predicate | She opened and read | One subject shares two verbs | Left-right subject evidence |
| Fragment tail | He paused, and then silence | Right side lacks finite verb | Strict verb check |
| Quote noise | Comma inside dialogue | Boundary may be speech punctuation | Dialogue-safe filter |
A compound sentence counter will identify coordinated independent clauses for you. A compound ratio is a thing. Semicolon signals is a thing, as are word combinations known as FANBOYS. False positives are common; check those first.
When writers begin paying attention to compounds, they typicaly start to notice that their sentences breathe. A page will feel either bloated or brisk depending on how often you connects independent clauses with a semicolon, a comma, or a FANBOYS word. And that’s no mere academic difference: it alters emphasis and rhythm. It also alters the sound of trustworthiness in an argument.
What Is a Compound Sentence?
Once you get into revision mode, you’ll find a tool that can counts actual coordinated clauses rather than every stray “and” coming in handy. The other type (which count as a compound) has two or more independent clause (clauses that could each stand alone). While this may sound simple, the calculator ignores what seems like same thing on surface and looks out for those true connections.
For example, a series of three things linked with commas and an “and” on the end may appear compound from across the room but it typically isn’t. That’s because second half does not contain a complete subject-verb pair in the relevant sense. Knowing this helps avoid error of assuming that all conjunctions are created equal.
There is options to set your parameters to make it looser or tighter based off whether you’re writing formal prose or dialogue. But these structures serves differing purposes, depending on genre. Compound ratios stays low in middle-grade fiction where there’s a need for ongoing movement through a story. Tightly linked academic writing is often higher, as the writer demands tighter connections between ideas.
When you look at ratio of your own page and compare it to what you know the intended home page should of be, you immediately have a sense. Gut feel alone rarely gives us this piece of the puzzle; most folks miss it. Even if grammar is impeccable, a spike to sixty percent in a memoir begins to sound repetitious. If your ear is complaining, the numbers just bear out what the ear has been saying all along.
The art, though, is in the false positives. “However” may be part of a sentence that’s realy just a couple of ideas jammed back to back with insubstantial punctuation. Maybe second half is a fragment in disguise, prettied up with a capital letter. The analyzer alerts you to those dangers and stops you from defending a structure that fall apart when examined closely.
It also identifies simple “and”s that connects things casually and drain energy from sentences. These connections often sneak into early drafts but should of been removed before they make prose feel as if it keeps having to pause for breath. You can see from the sample patterns on page that some signals bear greater weight then others.
Using two strong clauses with a semicolon feels more thoughtful and formal than using “but” between commas. A conjunctive adverb (e.g., “meanwhile” or “nevertheless”) provides a thoughtful pause that is lovely in an essay but can bring fiction to a halt. Understanding this pattern allow for careful choice, not just counting. It’s about control of pacing which means controlling the pace you build.
And no: Perfecting the percentage isnt the point. This is something writers fear will make their voice sound mechanical if they pay attention to it, but the reverse usualy occurs. Once you have permission to break these patterns on purpose, you can recognize which ones really work together and which ones just pretend to. Then, you can use a sudden simple sentence after a long compound passage to land with real force. You didn’t have that contrast unless you knew what you were looking at.
But ultimately, it isn’t about style; it’s about a tool to make a previously invisible habit visible so that you might change it. And then one day the rain stops. People fill the square. The page becomes a place again, not because all sentences are compound, but because you decided what to make them.
