What is keyword difficulty?
Keyword difficulty is a prediction. SEO tools such as Ahrefs, Semrush and Moz look at the pages currently ranking for a term, measure how many links they have and how strong the sites behind them are, and compress that into a number. A low score means the first page is held by pages a modest site could compete with; a high score means it is held by pages with hundreds of referring domains, and a new entrant would need years of authority to join them.
Each tool calculates it differently, so the same term can score 30 in one and 55 in another. The scores are comparable within a tool, not across them, and they are a rough gauge rather than a measurement.
Why it matters
Why keyword difficulty matters
Because effort should go where it can win. A site with a young domain and few links that targets the most competitive term in its category will spend a year producing nothing, while the same effort on fifty specific, lower-difficulty terms would be earning traffic within months. Difficulty is how a content plan is sequenced: the winnable terms first, to build the authority that makes the harder ones winnable later.
It also sets expectations with clients honestly. A brand that wants to rank for a two-word category term should be told, with numbers, what the sites currently holding it have, and how long the climb is likely to take.
In practice
How keyword difficulty works in practice
- 01
The score is a starting filter, not a verdict. Pull the keyword list with difficulty and volume, and plot one against the other: the terms with meaningful volume and low difficulty are the first targets. Then look at the actual results page for each shortlisted term, because the score misses things. Are the top results genuinely good, or thin pages coasting on domain strength? Does the intent match what you would publish? Is there a featured snippet, a video carousel or a set of ads that would push an organic result down the page anyway?
- 02
Weigh the score against your own site's authority. A difficulty of 40 is easy for an established publisher and hard for a new brand. Many tools estimate how many links a page would need to compete, which is more useful than the score alone, and the best check is whether any site comparable to yours already ranks on the first page. If one does, so can you.
Watch out
What people get wrong about keyword difficulty
Treating the number as objective. It is one tool's model of one signal, links, and it ignores content quality, intent fit, freshness and the dozens of other things that decide rankings. The other mistake is only chasing low scores, which leaves a site ranking for a thousand terms nobody searches. The third is ignoring the results page: a difficulty of 20 means nothing if the first page is all videos, or if the term's volume comes from a meaning you had not considered.
