Free Keyword Density Checker

How to use this the keyword density checker

1. 1

   Paste your article text

   Copy your article or blog post content and paste it into the text area. The tool accepts plain text of any length.

2. 2

   Optionally enter a focus keyword

   Type your target keyword or phrase in the focus keyword field. This lets the tool calculate the exact density for that specific term.

3. 3

   Review 1-word, 2-word, and 3-word phrase frequency

   The tool breaks your content into n-grams and shows the most frequent phrases at each length. Look for overused terms and missing related keywords.

4. 4

   Check your focus keyword density

   If you entered a focus keyword, check its density percentage. Aim for 0.5% to 2% for natural optimization without keyword stuffing.

What is keyword density

Keyword density is the percentage of times a specific keyword or phrase appears relative to the total word count of a page. It is one of the oldest on-page SEO metrics, and while search engines have evolved well beyond simple word counting, density still serves as a useful sanity check when writing content.

The formula is straightforward: (keyword count / total words) x 100. For example, if the phrase "SEO tool" appears 5 times in a 500-word article, the keyword density is 1.0%. For multi-word phrases, the denominator adjusts to the number of possible n-grams. In a 500-word text, there are 499 possible bigrams, so a 2-word phrase appearing 5 times has a density of (5 / 499) x 100 = 1.0%.

What is the ideal keyword density for SEO

There is no perfect number. Google's John Mueller has stated on multiple occasions that there is no ideal keyword density. Google's algorithms analyze semantic meaning, topic coverage, and user satisfaction, not raw keyword counts.

That said, a Surfer SEO study of 25,000 top-ranking pages found that primary keyword density averages between 0.5% and 2%. General guidelines based on ranking studies and practitioner experience fall within these ranges:

• 0.5% to 2.5% for your primary keyword. This range signals relevance without triggering over-optimization filters.
• Below 0.5%: the keyword may not be prominent enough for search engines to associate the page with that query.
• Above 3%: risks keyword stuffing, which can trigger ranking penalties or algorithmic demotion.
• Secondary keywords: 0.5% to 1% is typical. These support topical depth without competing with the primary term.

Focus on natural language. If the keyword feels forced when you read the sentence aloud, it probably is. Readability always beats density targets.

Why n-gram analysis matters

Analyzing keyword density at the single-word level only tells part of the story. N-gram analysis breaks your content into phrases of different lengths to reveal deeper patterns.

• 1-word analysis shows individual term frequency. Useful for spotting overused words or confirming your main topic is clear.
• 2-word and 3-word phrases reveal topical patterns and natural keyword clusters. These map closely to how people actually search.
• Long-tail keywords (2-3 word phrases) often have lower competition and higher conversion rates than broad single-word terms.
• Comparing your n-grams with top-ranking competitors reveals content gaps and terms you may be missing.

Keyword density vs. semantic SEO

Modern search engines understand far more than exact-match keyword repetition. Google's algorithms process synonyms, related concepts, entity relationships, and overall topic coverage. This is often called semantic SEO or topical relevance.

Instead of repeating one keyword over and over, use semantically related terms throughout your content. For example, if your target keyword is "best running shoes," you should also include phrases like "trail running," "cushioned sole," "running sneakers," and "arch support." This signals topical authority to search engines and creates a better reading experience.

This keyword density checker helps you spot over-reliance on a single phrase. If one keyword dominates your n-gram tables while related terms are absent, that is a signal to broaden your vocabulary and cover the topic more comprehensively.