What Is Keyword Difficulty? A Simple Guide (2026)

Keyword difficulty is a score, usually from 0 to 100, that estimates how hard it will be to rank in Google’s top 10 results for a keyword. A low score means the keyword should be easier to rank for. A high score means the pages already ranking are strong, and it will take more time, better content, and more links to beat them.

Every major SEO tool has its own version of the score. Ahrefs, Semrush, and Moz all call it keyword difficulty, but they do not work it out the same way, so the same keyword can get a different score in each tool. That is normal. The score is a rough guide, not an exact measurement — and Google does not publish a difficulty score of its own.

What Is Keyword Difficulty in Simple Terms?

Think of it this way. When you search for something on Google, ten pages sit on the first page of results. To rank for that keyword, your page has to beat at least one of them. Keyword difficulty looks at how strong those ten pages are and turns the answer into a number.

If the top 10 is full of small blogs with few backlinks, the score is low. If it is full of big brands with thousands of links each, the score is high. Keyword difficulty and what domain authority is are related ideas — both measure strength — but they are not the same thing. Domain authority scores a whole website. Keyword difficulty scores one keyword.

How the 0–100 Scale Works

Most tools use a 0 to 100 scale, where 0 is the easiest and 100 is the hardest. Semrush splits its score into six bands:

• 0–14: Very easy — a new site can rank with good content.
• 15–29: Easy — reachable with solid content and a few links.
• 30–49: Medium — you will need good content and real links.
• 50–69: Hard — the ranking pages are strong and well linked.
• 70–84: Very hard — mostly big brands and old, trusted pages.
• 85–100: Extremely hard — only the strongest sites compete here.

These bands are a guide, not a rule. A keyword with a score of 65 can still be worth targeting if your site already has authority on that topic. A keyword with a score of 20 can still be hard if the top results match the search intent perfectly and yours does not.

How Do SEO Tools Work Out Keyword Difficulty?

Each tool looks at the pages already ranking and measures their strength. The exact method is different in each one.

Ahrefs

Ahrefs bases its score on how many websites link to each of the top 10 ranking pages. The logic is simple: if every page on page one has links from hundreds of websites, you will need a similar number to compete. This is close to what domain rating is — Ahrefs’ own score for how strong a website’s link profile is.

Semrush

Semrush blends several signals: the median number of referring domains pointing to the ranking pages, the mix of follow and nofollow links, the median Authority Score of the ranking domains, and features of the results page itself. You can read the full method in Semrush’s guide to keyword difficulty. Semrush also offers a Personal Keyword Difficulty score, which we cover below.

Moz

Moz works its Difficulty score out from the Page Authority and Domain Authority scores of the pages ranking on the first page, adjusted for the expected click-through rate of the keyword. Moz uses a 1 to 100 scale instead of 0 to 100.

Why Do Different Tools Give Different Scores?

Because they measure different things. Ahrefs counts links. Semrush mixes links, authority, and the results page. Moz leans on its own authority scores. One comparison of the tools found their scores only partly agree with each other — they rank keywords in roughly the same order, but the numbers can be far apart.

That is why you should compare scores inside one tool, not across tools. A 40 in Ahrefs is not the same as a 40 in Semrush. Pick one tool, learn how its scores feel for your site, and stick with it.

What Keyword Difficulty Does Not Measure

A difficulty score leaves out a lot of things that decide whether you can rank:

• Content quality: the score does not read the ranking pages. A thin page with strong links can still be beaten by a better article.
• Search intent: it does not check whether the ranking pages match what the searcher wants.
• Your site’s strength: the standard score is the same for everyone. It does not know your site.
• Brand strength: people click on brands they know, and the score cannot see that.
• Freshness: it does not care whether the ranking pages are two weeks or ten years old.
• Spam: it says nothing about whether the ranking sites are low quality. That is a different check — a spam score looks at the signals that mark a site as spammy.

What Is Personal Keyword Difficulty?

Personal Keyword Difficulty (PKD) is Semrush’s answer to the biggest weakness of the standard score: it is the same for everyone. PKD adjusts the score for your own website, based on its authority. A keyword that looks hard in general can be easy for your site if you already rank for similar topics — and a keyword that looks easy can be hard if your site has no history in that area.

If your tool offers a personal score, use it. It is far more useful than the general number when you are picking keywords for your own site.

How to Use Keyword Difficulty When You Pick Keywords

Follow these five steps and the score becomes a useful filter instead of a trap.

1. Check difficulty and search volume together. A keyword with a score of 10 and 20 searches a month is not better than a keyword with a score of 45 and 2,000 searches a month. Both numbers matter.

2. Look at the actual top 10. Open the results page. Are the ranking pages strong brands, or small sites like yours? Are they old, thin, or off-topic? The real results page tells you more than the number does.

3. Compare scores inside one tool. Use one tool for all your keyword research so the scores mean the same thing every time.

4. Start low if your site is new. A new site should target keywords with scores under 30 first. As your site earns links and authority, you can move up to harder keywords.

5. Do not treat the score as a verdict. A high score means “hard”, not “impossible”. If the top results are weak on content or miss the searcher’s intent, a great article can still win.

Keyword Difficulty vs Search Volume

Search volume tells you how often people search for a keyword each month. Keyword difficulty tells you how hard it is to rank for it. Both are estimates made by tools, and both can be wrong — but they answer different questions.

Volume answers “is it worth it?” Difficulty answers “can I win it?” A good keyword has enough volume to matter and a difficulty score your site can handle. Beginners often chase high-volume keywords and ignore difficulty. That is backwards. A keyword with 300 searches a month and a score of 15 will bring you more traffic than a keyword with 10,000 searches and a score of 90 that you never rank for.

Keyword Difficulty vs Google Keyword Planner Competition

Google Keyword Planner shows a “Competition” column, but it measures something else entirely: how many advertisers are bidding on the keyword in Google Ads. It says nothing about organic ranking difficulty. A keyword can have “High” competition in Planner and still be easy to rank for organically, or the other way round. Do not mix the two up.

Frequently Asked Questions

What is a good keyword difficulty score?

It depends on your site. For a new site, a score under 30 is a good target. For an established site with strong links, scores of 50 or more are realistic. There is no single “good” number — only a number your site can handle.

What keyword difficulty should a new website target?

Start with keywords scoring 0 to 30. These are usually long-tail phrases with clear intent and weak competition. Win a few of those first, build up some links and traffic, and then move on to harder terms.

Does Google use keyword difficulty?

No. Keyword difficulty is a metric invented by SEO tool companies. Google ranks pages with its own systems and does not publish any difficulty score. The tools build their scores by studying the pages that already rank.

Is a keyword with 0 difficulty worth targeting?

Only if people actually search for it. A score of 0 usually means almost no competition — but it can also mean almost no searches. Check the search volume first. If the volume is real, a 0-difficulty keyword is a quick win.