·2 min
Keyword Difficulty
SEOkeyword research
What is keyword difficulty?
Keyword difficulty (KD) is a metric that indicates how hard it is to rank in Google's TOP 10 for a given keyword. Most SEO tools (Ahrefs, Semrush, Moz) calculate KD on a 0-100 scale, primarily based on the backlink profile of pages currently ranking for that keyword.
KD 0-20 = easy, 20-50 = medium, 50-70 = hard, 70+ = very hard.
Why does it matter?
- Prioritization — allows you to focus on keywords where you have a realistic chance
- Resource estimation — high KD = more content and links needed
- Strategy — new domains should start with KD 0-30 keywords, not KD 70+
How do tools calculate KD?
| Tool | Primary factor | Scale |
|---|---|---|
| Ahrefs | Referring domains of pages in the TOP 10 | 0-100 |
| Semrush | Backlinks + authority + traffic | 0-100 (%) |
| Moz | Domain Authority of pages in the TOP 10 | 0-100 |
Each tool calculates KD differently — do not compare values across tools.
What else affects real difficulty?
KD from tools is a simplification. Real difficulty also depends on:
- Topical authority — if you have authority in a niche, you rank more easily even on keywords with high KD
- Search intent — does your page match the intent? If the TOP 10 consists of comparisons and you have a blog post, KD is effectively higher
- Quality of content in the TOP 10 — if current results are weak, it is easier to outperform them
- SERP features — featured snippets and AI Overviews steal clicks
Keyword selection strategy
- New domain (DR < 20) — target KD 0-20, long-tail keywords
- Growing domain (DR 20-40) — KD 10-40, build content clusters
- Strong domain (DR 40+) — you can target KD 30-60
- Always verify manually — check the TOP 10 for a given keyword and assess whether you have a chance
Related Terms
- Keyword research — the process of researching keywords
- Long-tail keyword — long-tail keywords
- Domain Rating — domain strength metric
- SERP — search engine results page