Combined Readability Score Checker

Get All Readability Scores at Once

This combined readability score checker runs nine formulas on the same text: Flesch-Kincaid, SMOG, Gunning Fog, Dale-Chall, Automated Readability Index (ARI), Coleman-Liau, Linsear Write, Lix, and Rix. Paste once, compare every formula. No signup. Use it when you need to meet multiple guidelines (e.g. Flesch for marketing, SMOG for healthcare) or want a quick overview without opening nine separate pages.

Writers, editors, and content teams use a combined checker to measure clarity across different standards. Search engines and accessibility guidelines favor clear content; many organizations set targets like "8th grade or below." Seeing all scores side by side helps you spot where your text lands and revise accordingly.

This tool is especially useful when your audience or client requires a specific metric—for example, patient materials often need a SMOG grade, while marketing teams may report Flesch Reading Ease. Running all nine formulas here gives you one place to verify compliance and compare how the same text performs under each standard. Educators, healthcare communicators, and legal writers regularly use a combined readability checker to meet institutional guidelines without switching between multiple tools.

Why Compare Multiple Formulas?

Different formulas use different inputs—syllables, complex words, word lists, or character counts—so the same text can score differently. Comparing them shows you how each formula rates your content. Use the results to target a specific standard (e.g. SMOG for patient materials) or to get a fuller picture of readability.

What Each Formula Measures

Each of the nine formulas in this combined checker uses a different method to estimate reading difficulty. A short overview:

Flesch-Kincaid gives you both a 0–100 Reading Ease score and a U.S. grade level. It uses average sentence length and syllables per word. Widely used in business, education, and content marketing.

SMOG (Simple Measure of Gobbledygook) counts polysyllabic words (3+ syllables) and sentences to produce a grade level from 4th grade through college. Often required for healthcare and patient education.

Gunning Fog also uses sentence length and complex words (3+ syllables) to output a grade level. A score of 7–8 is commonly recommended for general audiences.

Dale-Chall measures vocabulary difficulty using a list of familiar words. Words not on the list count as difficult, and the result is interpreted as a grade level. Good for assessing vocabulary load.

Automated Readability Index (ARI) uses character and word counts instead of syllables, so it works well for automated processing. It outputs a grade level and is often used in technical or academic contexts.

Coleman-Liau uses letters per 100 words and sentences per 100 words. No syllable counting—useful when you want a character-based measure. It often produces slightly lower grade estimates than ARI.

Linsear Write was developed for U.S. Air Force technical manuals. It classifies words as easy (1–2 syllables) or hard (3+ syllables) and uses sentence length to produce a grade level.

Lix is a language-neutral formula based on sentence length and long words (over 6 letters). It outputs a score from about 20 to 60 rather than a grade level. Popular in Nordic countries and for multilingual content.

Rix is a simplified variant of Lix: long words (7+ letters) per sentence, expressed as a grade level. Used by teachers and librarians for quick assessment.

When to Use Which Score

No single formula fits every situation. Industry and institutional guidelines often specify which one to use. In healthcare and patient-facing materials, SMOG is frequently required or recommended; many organizations aim for 6th to 8th grade. For general marketing, web copy, and content strategy, Flesch Reading Ease (e.g. 60–70) or Flesch-Kincaid grade level (e.g. 8th grade or below) are common targets. Legal and academic writing may not set a strict readability target, but checking with ARI or Coleman-Liau can still help you gauge complexity.

Use this combined checker when you need to satisfy more than one standard—for example, a health campaign that must meet both internal Flesch targets and external SMOG requirements. When only one formula is mandated, you can still run all nine here to see how your text compares across methods, then focus revisions on the metric that matters for your audience.

Why Scores Differ Between Formulas

The same passage can score 6th grade on one formula and 9th on another because each formula measures different things. Flesch-Kincaid and SMOG both use syllables, but SMOG focuses on polysyllabic words, so text with many short sentences but long words can get a higher SMOG grade. Dale-Chall ignores sentence length and looks only at vocabulary against a word list. ARI and Coleman-Liau use character or letter counts, so they can rate text differently from syllable-based formulas. When scores disagree, trust the formula that your guideline or audience expects, and use the others as a broader picture of readability.

How to Improve Readability Across Formulas

Most readability formulas respond to shorter sentences and simpler vocabulary. Breaking long sentences into two or three shorter ones usually helps. Replacing jargon or rare words with common alternatives lowers difficulty on syllable- and vocabulary-based formulas. One main idea per sentence makes text easier to follow and tends to improve scores across the board.

That said, each formula weighs factors differently. Cutting syllables helps Flesch-Kincaid and SMOG more than ARI or Coleman-Liau, which care about character count. Simplifying vocabulary has a strong effect on Dale-Chall. Use the combined results to see which formulas rate your text highest or lowest, then revise with your target metric in mind and run the checker again to confirm.

How to Use This Tool

Using the combined readability score checker is straightforward:

1. Paste your text into the box at the top of the page. You can use a paragraph, a full article, or any sample you want to evaluate.
2. Click Analyze. The tool runs all nine formulas on your text and displays every score in one view.
3. Compare the results. Check which formulas give higher or lower grades and use the section above to understand what each one measures.
4. Revise and recheck. After editing for clarity or vocabulary, paste the updated text and run the analysis again to see how your scores change.

No account or signup is required. For deeper guidance on a single formula, use the dedicated calculator pages linked in the section below.

Other Readability Tools

For a single formula in depth: Flesch-Kincaid Calculator, Flesch Reading Ease, Flesch-Kincaid Grade Level, SMOG, Gunning Fog, Dale-Chall, ARI, Coleman-Liau, Linsear Write, Lix, Rix, and the full Readability Calculators hub.