Keyword Difficulty
Last updated September 2026
Keyword difficulty is a metric, usually scored 0 to 100, estimating how hard it would be to rank on page one for a given search term, based mainly on the backlink strength of pages currently ranking. It is a planning tool, not a guarantee, and different tools score the same keyword differently.
Keyword difficulty scores attempt to answer a practical planning question before any content gets written: given the pages currently ranking for a term, how much authority would a new or competing page need to break into page one. The score is almost always derived from the backlink profiles, and sometimes the overall domain authority, of the top-ranking results, not from the keyword itself.
01
Why scores diverge across tools
Ahrefs, Semrush, and Moz each calculate difficulty using their own backlink index and their own weighting formula, so the same keyword can show meaningfully different scores across platforms. None of them is measuring Google's actual algorithm directly; each is estimating based on what it can observe about the current top-ranking pages, which is why difficulty scores should be treated as directional, not absolute.
- 01
Search volume
is there enough demand to justify the effort
- 02
Difficulty
how strong are the pages currently ranking
- 03
Business fit
does the term actually match what the client sells or serves
- 04
Search intent
does the query even match the page format being planned
02
Why a low score is not automatically the right target
A keyword with low difficulty and low search volume can still be a poor use of content resources if it does not connect to anything the client's business actually offers, or if the volume is too thin to move any meaningful metric. Difficulty is one input among several in keyword research, not a standalone prioritization rule.
03
Why it matters for agencies
Clients frequently fixate on a single high-volume, high-difficulty term because it looked impressive in a pitch or a competitor's ranking, rather than on a realistic content plan built around what the site can actually compete for today. Part of the value an agency and its fulfillment partner provide is running the actual difficulty math against the client's current authority and setting expectations accordingly, rather than chasing the term that sounds best in a slide deck.
