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How to read a traffic number: Ahrefs, SEMrush and the rest
Traffic is an estimate, and every tool estimates differently. Compare like with like, and name the tool.
17 October 2026 · 4 min read
When someone says a site gets "30,000 visitors a month", the next question is: according to whom? Nobody outside the site owner sees the real count. Tools such as Ahrefs, SEMrush and Similarweb estimate it from their own data, and each uses different data.
Why the numbers differ
- Different data sources. Some tools track search rankings and estimate clicks. Others use panels of browsing data. The same site can look larger in one than in another.
- Organic search versus all traffic. Several tools report only the visits that come from search. A site with a big social or email audience can look small in them.
- Country filters. A figure for one country is not a figure for the world. Check which one you are looking at.
- Different dates. Traffic moves. A number from last year says little about this month.
How to compare fairly
- Use the same tool for every site you compare. A 12,000 in one tool and a 20,000 in another says nothing about which site is bigger.
- Look at the trend, not just the number. A steady line is more reassuring than a spike. A sharp fall deserves a question.
- Check where the traffic comes from. If you sell to one country, a site whose readers are mostly elsewhere is worth less to you.
- Ask for a screenshot, or check yourself. Free tools and trials show enough to spot a number that does not match.
When a figure looks too good
In our own checks we have seen a seller's list claim six-figure monthly traffic for a site where Ahrefs data showed close to none. We cannot say why the numbers were so far apart, and we are not suggesting a motive. It is the reason we name the tool next to every traffic figure on our sites list and prefer figures we have been able to check.
A practical rule: if a number is far above what the site's authority, niche and age would suggest, check it before you pay. The check takes a few minutes, and a bad placement costs far more.
What traffic can and cannot tell you
A larger audience raises the chance that someone reads and clicks your link. It does not guarantee it, and it says nothing about whether the readers are the right people. Relevance, the quality of the article and the placement of the link all affect the result. Read how to judge a guest post site for the other checks, and DA vs DR explained for what the authority numbers mean.
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