---
title: "Keyword Difficulty"
description: "A score (typically 0–100) that estimates how hard it would be to rank on the first page of Google for a given keyword, based primarily on the authority of pages currently ranking."
url: "https://skribra.com/glossary/keyword-difficulty"
type: "glossary-term"
category: "Keyword Research"
updated: "2026-06-08"
---

# Keyword Difficulty

**Definition.** A score (typically 0–100) that estimates how hard it would be to rank on the first page of Google for a given keyword, based primarily on the authority of pages currently ranking.

**In short.** Keyword Difficulty (KD) tells you how competitive a search term is. High KD means the top-ranking pages have strong authority — you'll need significant links and content investment to compete.

## Key points

- Keyword Difficulty scores vary by tool — Ahrefs, Semrush, and Moz each calculate it differently, so compare tools on the same scale
- KD is most useful as a relative filter, not an absolute score — a KD 40 keyword on Ahrefs is not the same difficulty as KD 40 on Semrush
- Low difficulty doesn't always mean easy wins — niche topics may have low KD simply because they have low search volume
- Consider topical authority in addition to KD: if your site already covers a topic extensively, you can rank for higher-difficulty terms faster

## How Keyword Difficulty Is Calculated

Most tools calculate Keyword Difficulty by analyzing the [backlink profiles](https://skribra.com/glossary/backlink) of the pages ranking on Google's first page for that keyword[1]. The logic: if the top 10 results are all from highly authoritative sites with many referring domains, it will be very difficult for a weaker site to displace them. Ahrefs' KD score specifically estimates the number of referring domains you'd need to rank in the top 10[1]. Some tools also incorporate on-page factors like content length and topical relevance. The result is that KD is closely correlated with [Domain Authority](https://skribra.com/glossary/domain-authority) of competing pages.

## How to Use KD in Keyword Selection

New or low-authority sites should target keywords in the KD 0–30 range, where ranking is achievable without a large [link building](https://skribra.com/glossary/backlink) investment[1]. Established sites with strong domain authority can compete for KD 40–70 keywords. KD 70+ typically requires significant authority and content investment. Filtering keyword lists by KD is a fast way to [find achievable opportunities](https://skribra.com/features/keyword-research) — sort by KD ascending while filtering for minimum [Search Volume](https://skribra.com/glossary/search-volume) to find the 'sweet spot' keywords where competition is manageable but traffic is worth pursuing. Pair this with [Keyword Intent](https://skribra.com/glossary/keyword-intent) analysis to ensure you're targeting terms with the right conversion potential.

## Keyword Difficulty vs. Business Value

Don't optimize purely for low difficulty[1]. A KD 60 keyword that describes exactly what your product does and converts well may be more valuable than 10 KD 20 keywords with tangential relevance. Combine keyword difficulty with commercial [Keyword Intent](https://skribra.com/glossary/keyword-intent), [Search Volume](https://skribra.com/glossary/search-volume), and business relevance to prioritize. [Long-tail variations](https://skribra.com/glossary/long-tail-keywords) of competitive head terms often have dramatically lower KD with higher conversion rates. Building [topic clusters](https://skribra.com/glossary/topic-cluster) around a central high-KD target while ranking for lower-KD cluster articles is the most efficient path to eventually competing for the hardest terms.

## Related terms

- [Search Volume](https://skribra.com/glossary/search-volume): The average number of times a keyword is searched per month in a given location, used to estimate the traffic potential of ranking for that term.
- [Long-Tail Keywords](https://skribra.com/glossary/long-tail-keywords): Specific, multi-word search phrases with lower individual search volume but higher purchase intent and lower competition than broad 'head' keywords.
- [Keyword Intent](https://skribra.com/glossary/keyword-intent): The underlying goal or purpose a user has when typing a search query — categorized as informational, navigational, commercial, or transactional — used to match content format to what searchers actually want.
- [Domain Authority](https://skribra.com/glossary/domain-authority): A third-party score (0–100) developed by Moz that predicts how likely a website is to rank in search engine results pages based on its backlink profile.

## Sources

1. [Ahrefs — Keyword Difficulty: How to Estimate Your Chances to Rank](https://ahrefs.com/blog/keyword-difficulty/)
2. [Ahrefs — Keyword Research: The Beginner's Guide](https://ahrefs.com/blog/keyword-research/)

## Machine-readable index

- HTML version of this page: https://skribra.com/glossary/keyword-difficulty
- Site index for agents: https://skribra.com/llms.txt
- Sitemap: https://skribra.com/sitemap.xml
- Public REST API: https://skribra.com/api/v1
- OpenAPI specification: https://skribra.com/openapi.json