How KD scores work#
Ahrefs, Semrush, Moz and others each calculate difficulty differently, usually on a 0–100 scale. Most weigh the number and quality of links pointing to the current top results. That makes KD a useful first filter, but it ignores content quality, intent match, site topical authority and SERP features.
Read KD alongside the actual results#
- Are sites similar to yours (size, niche) ranking on page one?
- Do weak results exist — forum threads, outdated posts, thin pages?
- Is the page one dominated by big brands, marketplaces or government sites?
- How much of the screen do ads, AI Overviews, maps or videos take?
- Do you already have topical authority around this subject?
A practical approach#
| Site stage | Target |
|---|---|
| New site | Low KD, long-tail, very specific intent |
| Growing site | Medium KD within your core topics |
| Established authority | Competitive head terms, supported by clusters |
Compare scores within one tool only — a 30 in one tool can be a 50 in another. Related: keyword research guide, search volume.