To check keyword difficulty online, use an SEO tool such as Ahrefs, Semrush, or Moz to enter your target keyword and receive a difficulty score — typically on a scale of 0 to 100. Keyword difficulty (KD) is a metric that estimates how hard it will be to rank on the first page of Google for a given search term, based primarily on the authority and quantity of backlinks pointing to competing pages. Most free and paid tools provide this score instantly, making it one of the fastest ways to evaluate whether a keyword is worth targeting. Choosing keywords with lower difficulty scores is one of the highest-leverage moves in any SEO strategy, especially for newer or smaller websites.
⚡ Key Takeaways
- Keyword difficulty is scored 0–100; scores under 30 are generally considered “easy” for most sites.
- Free tools like Google Keyword Planner and Ubersuggest let you check KD at no cost.
- Paid tools (Ahrefs, Semrush) give the most accurate difficulty scores, factoring in domain authority, backlink profiles, and content quality.
- Always pair keyword difficulty with search volume — a low-difficulty keyword with zero searches isn’t worth targeting.
- Different tools calculate KD differently, so cross-referencing two tools is best practice.
What Is Keyword Difficulty and Why Does It Matter?
Keyword difficulty (KD) is a numerical score — usually ranging from 0 to 100 — that predicts how competitive it will be to rank organically for a specific search query. The higher the score, the more authoritative your content and backlink profile need to be to appear on page one of Google’s search results. Tools calculate this score by analyzing the PageRank signals, domain authority, and backlink counts of the pages currently ranking for that keyword.
Understanding KD helps you prioritize your content calendar intelligently. According to Ahrefs, 90.63% of all pages get zero organic traffic from Google — largely because they target keywords that are too competitive for their current domain authority. By checking keyword difficulty before creating content, you dramatically improve your odds of actually ranking and driving traffic.
This metric is especially critical for new websites. If your domain is brand new, targeting keywords with a KD above 50 is often a waste of resources. Instead, building a foundation of low-difficulty, high-intent keywords is the smart path to sustainable organic growth. Learn more about how to build domain authority to improve your ability to rank for harder keywords over time.
How to Check Keyword Difficulty Online: Step-by-Step
The process to check keyword difficulty online is straightforward regardless of which tool you use. Here is a universal step-by-step workflow using Ahrefs’ free keyword checker as an example:
- Choose your SEO tool. Go to a keyword research tool such as Ahrefs Free Keyword Generator, Semrush, Moz Keyword Explorer, or Ubersuggest. Free tiers are available on most platforms.
- Enter your target keyword. Type the keyword or phrase you want to rank for into the search bar. Be specific — use the exact phrase your audience would type into Google.
- Select your target country. Most tools allow you to filter by country so you see difficulty scores relevant to your target market (e.g., United States, United Kingdom).
- Review the KD score. The tool will return a difficulty score (0–100). Note the number alongside the keyword’s monthly search volume and any SERP features (featured snippets, ads, etc.).
- Analyze the SERP competition. Click through to see which pages currently rank for that keyword. Examine their domain authority, content depth, and backlink count to validate the KD score.
- Compare related keywords. Use the tool’s suggestions to find related keywords with lower difficulty but similar search intent — these are your best opportunities.
- Record and prioritize. Export or copy your findings into a keyword tracking spreadsheet, sorting by difficulty and volume to build your content roadmap.
Repeating this process across a cluster of related keywords gives you a comprehensive picture of the competitive landscape before you invest time and resources in content creation. You can also explore our guide on keyword clustering strategies to maximize topical authority.
“Targeting the right keyword difficulty is not about avoiding competition — it’s about finding the exact intersection where your current authority meets real search demand. That’s where rankings happen.”
— SEO Best Practice, RankAuthority.com
Best Tools to Check Keyword Difficulty Online: Compared
How to Interpret Keyword Difficulty Scores
Once you have a KD score, knowing what it actually means for your site is critical. Here is a practical interpretation guide:
New and mid-authority sites can rank with well-written, optimized content and minimal backlinks. Ideal for building initial traffic.
Requires solid content, some backlinks, and a reasonable domain authority. Achievable for established blogs and businesses.
Competing pages have strong backlink profiles. You’ll need significant link-building efforts and high-quality, comprehensive content.
Dominated by high-authority domains (think Wikipedia, Forbes, major brands). Requires massive domain authority and extensive backlink campaigns.
Remember: KD scores are relative to your own domain’s authority. A site with a Domain Rating (DR) of 70 can target KD 50 keywords far more realistically than a site with a DR of 15. Always contextualize the score against your own site’s current strength.
Common Mistakes When Checking Keyword Difficulty
Even experienced SEOs make errors when evaluating keyword difficulty. Avoiding these pitfalls will save you months of wasted effort:
- Trusting one tool blindly. Each tool uses its own algorithm. Cross-reference at least two tools before making a final decision.
- Ignoring search intent. A low-KD keyword with mismatched intent (informational vs. transactional) won’t convert, even if you rank for it.
- Overlooking SERP features. If a keyword’s SERP is dominated by featured snippets, video carousels, or ads, organic CTR drops significantly even at position #1.
- Chasing volume over difficulty ratio. A keyword with 100 monthly searches and KD 5 can often generate more ROI than a keyword with 10,000 searches and KD 80.
- Not re-checking over time. Keyword difficulty changes as competitors publish and acquire links. Re-evaluate your target keywords every quarter.
Frequently Asked Questions
Can I check keyword difficulty for free?
Yes. Tools like Ubersuggest, Moz Keyword Explorer, KWFinder, and Ahrefs’ Free Keyword Generator all offer limited free access to keyword difficulty scores. Google Keyword Planner also provides a basic competition indicator (Low/Medium/High) at no cost, though it is less precise than dedicated SEO tools.
What is a good keyword difficulty score for a new website?
For brand-new websites with little domain authority, targeting keywords with a KD score of 0–20 is ideal. These low-competition keywords allow you to rank more quickly, build organic traffic, and establish topical authority before going after harder, higher-volume terms.
Why do different SEO tools show different keyword difficulty scores?
Each tool uses its own proprietary algorithm and data set. Ahrefs bases KD primarily on the number of referring domains linking to the top-ranking pages. Semrush factors in a broader set of signals. Moz uses its own Domain Authority metric. These methodological differences mean scores can vary significantly — sometimes by 20–30 points for the same keyword.
Is keyword difficulty the only metric I should consider?
No. Keyword difficulty should always be evaluated alongside monthly search volume, search intent (informational, navigational, transactional), SERP features, click-through rate (CTR) potential, and your own domain authority. A holistic view of these metrics leads to far better keyword prioritization decisions than KD alone.
How often should I check keyword difficulty for my target keywords?
Check keyword difficulty at the start of any new content project and revisit your entire keyword list at least quarterly. Competition changes as new pages are published, backlinks are built, and algorithm updates roll out. Regular audits help you spot newly accessible opportunities and avoid wasting resources on keywords that have become too competitive.
Knowing how to check keyword difficulty online is a foundational SEO skill that separates sites that grow from sites that stagnate. By using the right tools, interpreting scores in the context of your own domain authority, and pairing KD data with search volume and intent, you can build a keyword strategy that generates real, compounding organic traffic. Start with free tools if you’re on a budget, graduate to paid platforms as your site grows, and always cross-reference two sources before committing to a target keyword. Consistent, data-driven keyword selection is the engine behind every successful SEO campaign — and it all starts with checking that difficulty score. Visit RankAuthority.com for more in-depth SEO guides and tools to accelerate your rankings.
