What Is a Good Readability Score? Flesch-Kincaid Explained

I was staring at a readability score like it was a blood test

I was sitting in a coffee shop, editing a 1,300-word draft for a client, and the tool I was using threw out a number: Flesch Reading Ease 41 and Flesch-Kincaid Grade 12.3.

I nodded like I understood. I didn’t.

Because the draft felt… fine? It wasn’t poetry, but it also wasn’t legalese. And yet the software was basically telling me “congrats, you wrote something a tired adult doesn’t want to read.”

So I did what I always do when a metric annoys me: I chased it down until it stopped feeling mysterious. And the thing is, readability scores aren’t magic and they aren’t useless either. They’re just blunt instruments. If you treat them like a speedometer instead of a judge, they’ll keep you out of trouble (and yes, sometimes they’ll help you rank).

What a “good” readability score actually means (and why it depends)

A good readability score is the one that matches the reader’s situation. That’s the whole game. Someone skimming a “how to reset your router” post at 11:47 pm wants short sentences and familiar words. Someone reading a clinical trial summary expects longer sentences and some jargon, because that’s the job.

So when you ask “what is a good readability score,” I translate it as: “What score gets this piece accepted, read, and acted on?” That’s a craft question, not a math question.

Here’s the practical range I use when I’m writing stuff that needs to perform (search, conversions, newsletters, product education). I’m not saying these are laws. I’m saying if you land in these ballparks, you’re rarely embarrassed later.

Notice what I didn’t say: “Always aim for grade 7.” That advice floats around because it’s easy to repeat, and sometimes it’s right. But if you’re writing a compliance page, grade 7 can actually make you sound like you don’t know what you’re talking about.

So why does everyone get this wrong?

Because they treat readability like a universal score instead of a reader-fit score.

Flesch-Kincaid, explained like you’re not trying to impress anyone

Flesch-Kincaid is basically counting two things: sentence length and word complexity (measured by syllables). That’s it. One number tries to describe how hard your text is to read.

And yes, it can be gamed. You can write choppy nonsense with tiny words and “win” the score. You can also write something genuinely helpful that scores “bad” because you used necessary terms like “interoperability” or “dehumidification” or whatever.

Still, it’s useful because it catches the boring stuff we do when we’re tired: long sentences, stacked clauses, and that weird habit of turning verbs into nouns.

So if your sentences get longer, the grade goes up. If your words get more syllable-y, the grade goes up. And if you do both at the same time (which we all do when we’re trying to sound “professional”), your score climbs fast.

Here’s a worked example with real-ish numbers, because otherwise it stays abstract.

Example: You wrote 1,020 words across 51 sentences, and your text averages about 1.45 syllables per word.

• ASL = 1,020 ÷ 51 = 20 words per sentence
• ASW = 1.45 syllables per word
• Grade = (0.39 × 20) + (11.8 × 1.45) − 15.59
• Grade = 7.8 + 17.11 − 15.59 = 9.32

Grade 9-ish is… honestly pretty readable for a lot of web writing. Not “kids book,” not “academic journal.” Just normal.

And if you’re thinking, “Cool, I’ll just shorten every sentence,” yeah, you can, but you’ll also start sounding like a robot. The trick is to shorten the right sentences: the ones that carry the main idea.

Short sentences are a tool.

Not a personality.

The part people miss: readability is formatting, not just words

If you’ve written professionally for any amount of time, you’ve seen this: a piece can have “easy” sentences and still feel like a brick wall. That’s because readability tools mostly ignore layout. Readers don’t.

Here’s what actually moves the needle in the real world, especially for getting published, getting clients to approve drafts without 47 comments, and keeping bounce rates from doing that sad little spike.

So, yes, you’ll tweak sentences. But you’ll also do the boring craft stuff: break up paragraphs, add signposts, and stop hiding the point until the end. I’m going to be slightly redundant here because it matters: people don’t read your article, they scan it and then decide whether they’re going to read it.

What I do in practice (for a 1,000–1,600 word how-to):

• Paragraph length: I keep most paragraphs to 1–4 lines on mobile. If I see a paragraph that looks “tall,” I split it, even if the sentences are fine.
• Subheads every 200–350 words: Not because of some rule, but because that’s the moment a skimmer needs a new hook.
• One idea per paragraph: If a paragraph has “and also” twice, it’s probably two paragraphs.
• Lists for sequences: If there’s a process, I list it. Readers love a list because it feels finishable.
• Front-load definitions: If you’re going to use a term 12 times, define it once early (then move on with your life).

And here’s the funny part: when you do those layout fixes, your readability score often improves anyway. Shorter paragraphs tend to mean shorter sentences, because you stop stacking ideas.

(Also, if you’re writing for SEO, Google isn’t “grading” your Flesch score directly in any simple way I’d bet my reputation on. But users behave differently when text is easier to consume, and user behavior is the whole quiet feedback loop.)

That’s the real reason I care.

How I raise readability without dumbing anything down

I’ll give you my actual workflow. It’s not glamorous. It’s the stuff you do when you want clean copy and you don’t want to rewrite the entire draft from scratch.

Step 1: Find the “sentence snakes.” I search for sentences over about 25–30 words. Not all of them are bad, but that’s where the sludge hides. Split them where the thought naturally turns.

Step 2: Kill nominalizations (the sneaky ones). If you wrote “implementation,” “utilization,” “optimization,” there’s often a verb hiding underneath. “Implement,” “use,” “improve.” Your grade level drops and your writing gets punchier. And it sounds more like a human wrote it, which is increasingly… useful.

Step 3: Swap “glue phrases.” Stuff like “in regard to,” “with respect to,” “in the event that.” You don’t need them. Replace with “about,” “for,” “if.”

Step 4: Keep the technical terms that earn their keep. If the term is necessary, keep it. Just don’t stack three of them in one sentence. Define it once, then use it consistently.

Step 5: Read it out loud once. This is the oldest trick in the book and it still works. If you run out of breath, the reader ran out of patience three clauses ago.

And yes, sometimes you’ll do all that and your score barely moves. That’s okay. If the piece reads better, it is better.

But if you want the number too, you can get it.

For quick checks, I use calculators instead of guessing. Here are the ones I built into ProCalc.ai for this exact kind of work:

• Flesch-Kincaid Grade Level calculator
• Flesch Reading Ease calculator
• Readability score checker (multi-metric)
• Average sentence length calculator
• Words per paragraph estimator

If you’re editing for publication, I’ll give you a very specific move: run the draft, then run just your intro and your first two subhead sections. If the opening scores way worse than the rest, it usually means you’re “warming up on the page” and the reader is paying the price.

Fix the beginning, and the whole piece suddenly feels easier. And it works!

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