How to Check Keyword Difficulty for Free (3 Methods)

Keyword Difficulty (KD) is one of the most important metrics in SEO. It tells you how hard it will be to rank on page 1 for a given keyword — so you can focus on opportunities you can actually win.

The problem: most tools that show KD scores cost $30–$119/month. But you can check keyword difficulty for free, if you know the right methods.

This guide covers three practical ways to assess keyword difficulty without paying — and explains what the numbers actually mean.

What is keyword difficulty?

Keyword difficulty is a score (usually 0–100) that estimates how competitive a keyword is in Google's organic search results.

High KD (70–100): The top 10 is dominated by high-authority domains (Wikipedia, BBC, Amazon, major publications). Ranking here takes years of link building and domain authority.

Medium KD (30–69): A mix of strong and moderate sites. Possible to rank with consistent, high-quality content and some backlinks.

Low KD (0–29): Weaker competition. New or mid-authority sites can rank with well-optimised content, sometimes without many backlinks.

Most keyword tools calculate KD based on the backlink profiles of the pages currently ranking — the stronger their link profiles, the higher the KD.

Method 1: Use Serpvox (free plan)

The easiest way to check KD for free is with Serpvox.

Enter any keyword and Serpvox shows:

• •KD score (0–100) based on the PageRank of the top 10 ranking domains
• •SERP breakdown — who is ranking, with their individual PageRank scores
• •"Attackable" badge on results with weak PageRank (easy targets)
• •12-month trend — is the keyword growing or declining?
• •Search intent — what does the user actually want?

The free plan gives 3 searches per day — enough to check your most important keywords.

Check keyword difficulty for free →

Method 2: Manually analyse the SERP

This is the method every experienced SEO uses, regardless of what tools say. KD scores are estimates — the SERP itself is the truth.

Step-by-step:

1. •Search your keyword on Google (use an incognito window to avoid personalisation)
2. •Look at the top 10 results and ask:

Who is ranking?

• •Wikipedia, Amazon, major news sites, government domains → very hard
• •Large industry blogs, well-established brands → medium-hard
• •Small blogs, forum threads, thin pages → opportunity

How old are these pages?

• •Pages ranking from 2015–2020 that haven't been updated → beatable
• •Pages updated in 2025–2026 with fresh content → active competition

What is the content quality?

• •Shallow, poorly structured pages → you can outrank with thorough content
• •Comprehensive guides with good UX → harder to beat

How many backlinks do the top pages have?

• •Use Ahrefs free backlink checker to spot-check a few URLs

A manual SERP review takes 5 minutes and tells you more than any automated KD score.

Method 3: Check Google's SERP features

Google adds SERP features (Knowledge Graph, Featured Snippets, People Also Ask) to keywords where it feels the existing content doesn't fully satisfy user intent. These are signals of opportunity.

Look for:

• •Featured Snippet — Google is trying to improve the answer. A well-structured article with a clear, direct answer can win this.
• •People Also Ask — Multiple subtopics haven't been fully covered. Write the most comprehensive answer.
• •Lots of ads — High CPC signals commercial intent. This also attracts strong competitors.
• •No ads — Lower competition, purely organic intent.

You don't need a tool for this — just Google yourself.

What KD score ranges mean in practice

| KD Score | What it means | Recommendation | |---|---|---| | 0–15 | Very low competition | Target immediately — high win probability | | 16–30 | Low competition | Good opportunity for new sites | | 31–50 | Medium competition | Achievable with quality content + some backlinks | | 51–70 | Hard | Requires domain authority — focus on longtail variants first | | 71–100 | Very hard | Only viable for high-authority sites |

For a new site (less than 1 year old): focus on KD 0–25. For a growing site (1–3 years): target up to KD 40. For an established site: KD up to 60–70 is realistic.

The KD mistake most beginners make

Trusting KD scores blindly.

KD is an estimate. The actual difficulty depends on your site's authority, your content quality, your backlink profile — and whether the top-ranking pages are actively maintained.

A keyword with KD 45 might be easy to rank for if the top 10 is full of outdated, thin content. A keyword with KD 20 might be hard if the top result is a perfectly optimised, regularly updated page from a niche authority site.

Always combine KD scores with a manual SERP review.

Frequently asked questions

What KD should beginners target? For a new blog or website, focus on keywords with KD under 25. These give you the best chance of appearing in the top 10 within 3–6 months with solid content. As your domain builds authority, gradually target higher KD keywords.

Is keyword difficulty the same across all tools? No. Ahrefs, SEMrush, Moz and Serpvox all use different algorithms to calculate KD. Serpvox uses domain PageRank from the actual top 10 results. Ahrefs uses URL-level backlink data. Never mix KD scores from different tools for comparison.

Can I rank for a high KD keyword without backlinks? Rarely. For KD above 50, you typically need a combination of domain authority (backlinks) and highly relevant, comprehensive content. The exception: Featured Snippet opportunities, where Google may reward a perfectly structured answer regardless of link profile.

Conclusion

You don't need to pay $100/month to check keyword difficulty. The combination of Serpvox's free plan (real PageRank-based KD + full SERP analysis) and manual SERP inspection gives you everything you need to find rankable keywords.

The key insight: KD scores are a starting point. The SERP is the truth. Use both.

Check KD for any keyword free →

Read also: Keyword difficulty explained in depth · How to analyse the Google SERP · Keyword research free guide