You've found a keyword with decent search volume. It looks promising. But before you spend weeks creating content around it, you need to answer one question: can you actually rank for it?
That's what keyword difficulty tells you — and checking it before you commit to a keyword is the difference between SEO that works and SEO that wastes your time.
In this guide, I'll walk you through exactly how to check keyword difficulty for free, what the numbers actually mean, and how to use them to pick keywords your site can win.
What Is Keyword Difficulty?
Keyword difficulty (KD) is a score — typically 0 to 100 — that estimates how hard it would be to rank on the first page of Google for a given keyword. The higher the score, the more competitive the keyword.
But here's what most guides won't tell you: keyword difficulty scores vary between tools. A keyword rated 45 in Ahrefs might show as 62 in Moz and 38 in SEMScoop. That's because each tool uses different factors in its calculation.
What matters isn't the absolute number — it's what goes into the calculation and whether it reflects the real competitive landscape.
What Makes a Keyword Difficult?
Keyword difficulty isn't just one metric. It's a combination of factors:
- Domain authority of ranking pages — If the top 10 results are all from sites like Forbes, Wikipedia, and HubSpot, you're competing against massive domain authority.
- Backlink profiles — Pages with hundreds of quality backlinks are harder to outrank than pages with few or no backlinks.
- Content quality and depth — Google rewards comprehensive content that fully answers the searcher's intent.
- SERP features — Featured snippets, AI overviews, People Also Ask boxes, and knowledge panels can push organic results further down the page.
- Search intent alignment — If Google shows mostly product pages for a keyword and you're writing a blog post, your content type doesn't match the intent.
A good keyword difficulty checker accounts for all of these, not just domain authority.
How to Check Keyword Difficulty for Free (Step-by-Step)
Here's a practical walkthrough using SEMScoop's free keyword difficulty checker:
Step 1: Enter Your Keyword
Go to SEMScoop's keyword tool and type in the keyword you want to evaluate. Select your target country and language, then hit search.
SEMScoop analyses the live SERP in real-time — it doesn't rely on cached data from weeks ago. This matters because search results change constantly, and a difficulty score based on old data can be misleading.
Step 2: Read the Difficulty Score
SEMScoop returns a difficulty score along with a colour-coded indicator:
- Green (0–30) — Low difficulty. A newer site with good content can rank for these.
- Yellow (31–50) — Moderate difficulty. You'll need solid content and some domain authority.
- Orange (51–70) — Hard. Established sites with good backlink profiles compete here.
- Red (71–100) — Very hard. Dominated by high-authority sites. Unless you're a major brand, look elsewhere.
Step 3: Analyse the SERP Results
The difficulty score is your starting point, but the real insight comes from looking at who is ranking. SEMScoop shows you the top search results with their domain authority, page authority, and backlink counts.
Ask yourself:
- Are there any low-authority sites in the top 10? If a site with DA 20 is ranking, a similar site can too.
- Are the top results from niche sites or generic giants? Niche sites suggest Google values topical relevance over raw authority.
- How many backlinks do the top results have? If the average is under 50, you're in a winnable range.
Step 4: Check Search Volume and CPC
Difficulty alone doesn't tell you whether a keyword is worth targeting. You also need:
- Search volume — How many people search for this keyword per month? A keyword with difficulty 15 but only 10 monthly searches isn't worth a dedicated blog post.
- CPC (Cost Per Click) — High CPC indicates commercial intent. Advertisers are willing to pay for this traffic, which means it's valuable.
The sweet spot is keywords with moderate volume (500+), low difficulty (under 40), and meaningful CPC.
Step 5: Look at Related Keywords
SEMScoop also shows related keywords with their own difficulty scores and volumes. Often, a slight variation of your original keyword will have significantly lower difficulty with similar volume.
For example, "keyword research tool" might have a difficulty of 72, while "keyword research tool for beginners" might be 28. Same topic, different competitiveness.
What Is a Good Keyword Difficulty Score?
This depends entirely on your site's authority:
- New sites (DA under 20) — Target keywords with difficulty under 25. Focus on long-tail, specific queries.
- Growing sites (DA 20–40) — You can compete for keywords with difficulty up to 40-45, especially in your niche.
- Established sites (DA 40+) — You can go after keywords with difficulty up to 60-65, provided your content is excellent.
The biggest mistake in keyword research is targeting keywords that are too difficult for your site's current authority. A perfectly written article won't rank if every competing page has 10x your domain authority and 50x your backlinks.
Beyond the Score: When Difficulty Is Misleading
Keyword difficulty scores are useful but imperfect. Here are situations where the score doesn't tell the full story:
High Difficulty, But Weak Content
Sometimes a keyword shows high difficulty because authoritative sites rank for it — but their content is thin, outdated, or doesn't fully answer the query. If you can create significantly better content, you can outrank higher-authority pages.
This is why examining the actual SERP results (Step 3) matters more than the score alone.
Low Difficulty, But Wrong Intent
A keyword might show low difficulty because few pages target it. But if the search intent doesn't match your content, ranking won't drive useful traffic. Always check what Google currently shows for the keyword — if the results are all e-commerce pages and you're writing a blog post, the intent doesn't match.
AI Overviews Changing the Game
In 2025-2026, Google's AI Overviews have added a new layer of complexity. Some keywords that look easy to rank for now have an AI-generated answer at the top of the page, pushing all organic results below the fold. This effectively reduces the click-through rate for everyone ranking below.
When evaluating keyword difficulty, check whether the keyword triggers an AI Overview. If it does, you may need to target a more specific variation that doesn't.
A Practical Workflow for Finding Winnable Keywords
Here's the process I recommend:
- Start with a seed keyword related to your topic.
- Check difficulty using SEMScoop. If it's above your target range, look at the related keywords.
- Find the sweet spot — a related keyword with lower difficulty but still meaningful volume.
- Analyse the SERP — look at who's ranking and whether you can realistically compete.
- Check for gaps — is there something the top results aren't covering that you can add?
- Create your content — make it better, more comprehensive, and more up-to-date than what's currently ranking.
This approach is more effective than chasing high-volume, high-difficulty keywords where you have no realistic chance of ranking.
Common Mistakes When Checking Keyword Difficulty
Only Looking at the Number
A difficulty score of 35 means different things for different keywords. Always look at the actual SERP to understand why it's rated that way.
Ignoring Search Intent
Ranking for a keyword doesn't matter if the traffic doesn't convert. Informational keywords ("what is keyword difficulty") drive different behaviour than commercial keywords ("keyword difficulty checker free"). Match the intent to your goals.
Checking Once and Forgetting
Keyword difficulty changes over time. A keyword that was easy to rank for six months ago might now be competitive if several new sites have published content targeting it. Re-check periodically, especially for your most important keywords.
Targeting Only Low-Difficulty Keywords
While it's smart to start with easier keywords, you also need some ambitious targets. Build authority with low-difficulty wins, then gradually move up to more competitive terms as your domain authority grows.
Wrapping Up
Checking keyword difficulty isn't complicated — but it is essential. Every keyword you target is a time investment, and the difficulty score helps you invest wisely.
The key takeaway: don't just look at the number. Use it as a starting point, then dig into the SERP to understand the real competitive landscape. That's where the actual insights are.
Try SEMScoop's free keyword difficulty checker — you get 2 free searches per day with full SERP analysis, difficulty scores, and related keywords. No signup required.