Keyword Difficulty
Estimates how hard it is to rank for a search query by scoring the competitiveness of its search results page on a numeric scale.
If you have ever picked a keyword with a low difficulty score and still failed to rank, you already know the number is not the whole story.
Key points
- Treat keyword difficulty as a directional estimate, not a guaranteed prediction of ranking success.
- Compare difficulty scores only within the same tool; different tools use different formulas and scales.
- Always pair keyword difficulty with search intent and volume to choose realistic targets.
- A high difficulty score does not mean a keyword is impossible; it signals stronger competition requiring more resources.
- Free backlink checkers often use simplified models, so their difficulty scores may differ from paid tools.
- Incorporate keyword difficulty into your keyword research process, but never rely on it alone.
The same keyword, three different scores
A search for 'best running shoes' might show a keyword difficulty of 85 in Ahrefs and 72 in Semrush. Meanwhile, 'best running shoes for flat feet' scores 35 in both tools. The long-tail keyword also matches purchase intent better, making it the smarter target despite lower search volume. This illustrates why you should never rely on a single score without context.
Three situations where this changes your decision
- Intent mismatch A low difficulty score is meaningless if the keyword intent does not match your page. For example, a transactional query requires a product page, not a blog post.
- SERP features If the results page is dominated by featured snippets, videos, or local packs, the organic difficulty may be higher than the score suggests.
- Topical authority A high difficulty keyword becomes more achievable if your site already has strong topical authority on the subject, as search engines reward expertise.
Four ways it goes wrong
- Cross-tool comparison Comparing difficulty scores from different tools is invalid because each uses its own model and data sources.
- Ignoring search volume A very low difficulty keyword with zero search volume is not worth targeting, regardless of the score.
- Overlooking intent Choosing a keyword solely by low difficulty can lead to content that does not satisfy user intent, hurting performance.
- Assuming static scores Keyword difficulty changes over time as new pages rank, backlinks shift, and algorithms update. Recheck before committing.
What to check before acting on a score
- Search intent Verify that the top-ranking pages match the intent you plan to target. If they are all product pages, a blog post will struggle.
- Backlink profile Analyse the backlink strength of current top results. If they have thousands of links from authoritative domains, the difficulty is real.
- Content quality Assess whether you can create content that matches or exceeds the depth and quality of current top pages.
- Your own authority Consider your site's current domain authority and topical relevance. A new site should target lower difficulty terms first.
Common questions
Where is the best place to include your target keyword?
In the title tag, H1, and naturally within the first 100 words of the body, but never forced.
What is a good keyword difficulty score?
There is no universal 'good' score; it depends on your site's authority and resources. A score under 30 is generally easier for new sites.
Sources
- Semrush Knowledge Base: Keyword Difficulty score Explains how Semrush calculates KD and how to use it.
- Ahrefs Blog: Keyword Difficulty Covers the concept, factors, and best practices for keyword difficulty.