SEO
Keyword Difficulty
Quick definition
Keyword Difficulty (KD) is a tool-specific 0–100 score estimating how hard it will be to rank in the top 10 for a given keyword.
Most SEO tools (Ahrefs, Semrush, Moz) calculate KD from the backlink profiles of currently-ranking pages. Higher KD typically means stronger competitor link profiles.
Why Keyword Difficulty matters
KD is directional, not absolute. A 'low KD' keyword can still be hard if SERPs are dominated by major brands, and a 'high KD' keyword can be winnable with strong topical authority.
How Keyword Difficulty works in practice
Use KD as one input alongside SERP analysis, search intent, and your site's relative authority. Don't pick keywords on KD alone.