Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Score your content against common on-page SEO best practices: length, keyword density, headings, and readability.
Enter your content to see an SEO score.
This tool scores your content against four commonly published on-page SEO best practices: word count, focus-keyword density, subheading usage, and readability -- each worth 25 points, for a transparent 0-100 score. This is a rules-based checklist, not an AI-generated opinion -- every point is explained.
Paste your content, enter your focus keyword, and specify how many subheadings it has. The score and a breakdown of each check appear instantly.
Word count -- 25 points if 300+ words (partial credit below that)
Focus keyword density -- 25 points if between 0.5% and 2.5%
Subheadings -- 25 points if 2 or more
Readability -- 25 points if Flesch Reading Ease is 50 or higher
This is a rough content-quality checklist, not a guarantee of ranking -- real SEO performance depends on many factors beyond on-page content (backlinks, site authority, user experience, search intent match). Treat this as one useful editing signal among many.
The page summary lists the four checks, but the partial-credit rules are worth knowing because they explain most scores you will see in practice.
The density check counts how many times your focus keyword appears in the text, lowercased, then divides the words those mentions cover by the total words. A multi-word keyword such as "meta description length" is counted as a whole phrase, each occurrence in order. Variants such as plural forms do not count: if your keyword is "calculator" and your text says "calculators", those mentions are not tallied.
Suppose a draft has 240 words, the keyword "budget" appears 4 times, you entered 1 subheading, and the Flesch Reading Ease comes out at 62. Word count gives 240 / 300 x 25 = 20 points. Density is 4 / 240 = 1.67 percent, inside the band, so 25 points. One heading gives 12 points. Readability of 62 passes, so 25 points. The total is 82 out of 100. The fastest single gain is adding one more subheading, which lifts the score by 13 points and probably improves the structure for readers too.
Very short pages such as a tool landing page, a contact page, or a product variant will naturally lose word-count points even when they fully serve their purpose. Long guides can lose readability points because of quoted material, code, or lists that confuse sentence detection. Sentences are split on periods, exclamation marks, and question marks, so abbreviations and decimal-style numbers can slightly distort the readability figure.
Use the tool as a quick pre-publish checklist: paste the final body text without navigation or footer content, enter your main keyword or phrase, count your real H2 and H3 headings, and review which rows failed. Then decide, as an editor, whether each failure is a real problem for your reader or an acceptable trade-off for this particular page.
No -- this checks a handful of well-known on-page signals, not the full ranking algorithm. Use it as a content-quality sanity check, not a ranking predictor.
Yes. A phrase such as "meta description" is counted each time the words appear together in that order. A density of 0% then means the exact phrase never appears, not that the words are missing.
The keyword check scores 0, so the maximum is 75 out of 100 from the other three checks.
No. It analyzes plain pasted text, and you type the number of subheadings yourself. Count the real H2 and H3 headings in your draft and enter that figure.
Not necessarily. A short, focused page can serve readers perfectly well with a lower score. Use the failed rows as prompts for editing decisions, not as requirements.
Reference: Google Search Central