Advice and answers from the Ahrefs Team

To get 'Organic Traffic' numbers, we put every keyword into Google and check the position where your site ranks. That’s where we get positions from.

Then we take estimated monthly traffic from Google’s records, apply the tracked position and calculate how much traffic (approximately) this keyword should bring. 

Thus, the traffic roughly equals search volume multiplied by the percentage of clicks for a given search position. 

So if the first position receives 30% of all traffic, and the keyword is searched for 20 times a month, the estimated traffic would be 20 * 0.3 = 6.

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