Keyword Difficulty (KD)
A metric that estimates how hard it will be to rank on the first page of Google for a specific keyword, based on the authority and content quality of pages currently ranking. Scored 0-100 by most SEO tools.
Keyword Difficulty Tells You Where to Compete
Not all keywords are worth chasing. A keyword with 10,000 monthly searches and 80 KD will take years and significant investment to rank for. A keyword with 500 monthly searches and 10 KD can rank in weeks with good content. Keyword difficulty helps you pick battles you can actually win.
How KD Is Calculated
Most SEO tools calculate KD based on the backlink profiles of the top-ranking pages. More backlinks from high-authority domains = higher KD. Some tools also factor in content quality, on-page signals, and domain authority of ranking pages. It is an estimate based on correlation, not a guaranteed difficulty score.
The KD Strategy for SaaS
Target low-KD keywords first to build topical authority and traffic. Use those rankings to earn backlinks and increase domain authority. Then progressively target higher-KD keywords as your authority grows. Trying to rank for KD 60+ keywords with a new site is like challenging the heavyweight champion in round one.
When to Ignore KD
Sometimes the SERP is weaker than the KD score suggests. If top results are outdated, poorly written, or from mismatched domains (forums, news sites), you can outrank them with excellent content despite high KD. Always eyeball the actual search results before dismissing a keyword as too competitive.
Frequently Asked Questions
What keyword difficulty should SaaS companies target?
For new or low-authority sites (DR under 30): target KD 0-15. For growing sites (DR 30-50): target KD 15-35. For established sites (DR 50+): target KD 30-60. Going after KD 70+ keywords requires significant authority and backlink investment. Start low, build authority, then attack harder keywords.
How accurate are keyword difficulty scores?
They are directional, not precise. Ahrefs, Semrush, and Moz all calculate KD differently. Use one tool consistently for relative comparisons. A KD 20 keyword in Ahrefs is easier than a KD 40, but the absolute number means different things across tools. Always check the actual SERP to validate — sometimes high-KD keywords have weak results that can be outranked.
